From 9b6c7ca598b21d0f3b26ccf4b1ccb5e1151737ef Mon Sep 17 00:00:00 2001
From: Buddy <git@buddy.wtf>
Date: Sat, 22 Aug 2026 12:45:00 -0700
Subject: [PATCH] test: add a Vitest + jsdom test suite

No test coverage existed before this. Adds vitest + jsdom (2 new
devDependencies) and a suite that runs entirely without a browser: real
Leaflet objects work fine under jsdom for everything this library needs to
verify (option/attribute wiring, event forwarding), given a ResizeObserver
stub in test/setup.ts (jsdom's only real gap here).

- test/core/with-props.test.ts: the WithProps mixin itself, against a fake
  Leaflet-like class -- attribute<->setter dispatch, get/attribute/default
  fallback order, event-driven attribute sync-back, positional/recreate/
  attach modes, and the generic fire()-patch event forwarding. Child
  registration (popup/tooltip/layer binding) uses real Popup/Tooltip/Marker
  instances since #onChildRegister discriminates by instanceof.
- test/core/props.test.ts: the codec functions in isolation.
- test/components/*.test.ts: grouped smoke tests across all components.
- test/integration.test.ts: full tree wiring (map + tile-layer +
  feature-group + marker + popup).

Caught and fixed one real bug along the way: urlProp's "live url getter"
from the last refactor was dead code -- neither ImageOverlay nor
VideoOverlay actually expose getUrl(). Removed it and the now-pointless
getUrl?() from the Sourced interface in shared-props.ts.

tsconfig.test.json keeps test/ out of the tsc build (dist/ stays
test-free) while still typechecking it; oxlint.config.ts now covers test/
too, with max-classes-per-file relaxed there since testing a class
factory means many small one-off element classes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
---
 CLAUDE.md                                   |   17 +-
 oxlint.config.ts                            |   11 +
 package-lock.json                           | 2170 +++++++++++++++++--
 package.json                                |   12 +-
 src/core/shared-props.ts                    |    5 +-
 test/components/controls-and-groups.test.ts |  101 +
 test/components/geojson.test.ts             |   56 +
 test/components/icons.test.ts               |   62 +
 test/components/latlng-bindables.test.ts    |  126 ++
 test/components/overlays.test.ts            |  100 +
 test/components/shapes.test.ts              |  147 ++
 test/components/tile-layers.test.ts         |   68 +
 test/core/props.test.ts                     |  112 +
 test/core/with-props.test.ts                |  481 ++++
 test/integration.test.ts                    |   84 +
 test/setup.ts                               |   10 +
 tsconfig.test.json                          |   10 +
 vitest.config.ts                            |    9 +
 18 files changed, 3353 insertions(+), 228 deletions(-)
 create mode 100644 test/components/controls-and-groups.test.ts
 create mode 100644 test/components/geojson.test.ts
 create mode 100644 test/components/icons.test.ts
 create mode 100644 test/components/latlng-bindables.test.ts
 create mode 100644 test/components/overlays.test.ts
 create mode 100644 test/components/shapes.test.ts
 create mode 100644 test/components/tile-layers.test.ts
 create mode 100644 test/core/props.test.ts
 create mode 100644 test/core/with-props.test.ts
 create mode 100644 test/integration.test.ts
 create mode 100644 test/setup.ts
 create mode 100644 tsconfig.test.json
 create mode 100644 vitest.config.ts

diff --git a/CLAUDE.md b/CLAUDE.md
index 569e3fa..d0a39fe 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -6,14 +6,25 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ```bash
 npm run build      # tsc emits individual ESM modules to dist/ (no bundling)
-npm run typecheck  # tsc --noEmit
-npm run lint       # oxlint over src/
+npm run typecheck  # tsc --noEmit, then tsc -p tsconfig.test.json for test/
+npm run lint       # oxlint over src/ and test/
 npm run format     # Prettier formatting
+npm run test       # vitest run
+npm run test:watch # vitest, watch mode
 ```
 
 Linting runs on `oxlint`, not ESLint/`@typescript-eslint`. This project pins `typescript@^7.0.2`, and `@typescript-eslint` has no released version that supports it (peer range caps at `<6.1.0`, and even loading `@typescript-eslint/parser` crashes against TS 7's package shape). `oxlint` has its own parser and doesn't touch the `typescript` package, so it works regardless of TS version — the tradeoff is no type-aware rules (no `no-floating-promises`, `no-unnecessary-condition`, etc.). Revisit once `@typescript-eslint` supports TS 7.
 
-There are no tests in this project. To preview components locally, open `index.html` in a browser with any static-file server.
+### Testing
+
+Tests run under Vitest + jsdom (`test/**/*.test.ts`), with a single setup file (`test/setup.ts`) that stubs `ResizeObserver` -- jsdom doesn't implement it, and `leaflet-map.ts` constructs one unconditionally. Real Leaflet objects work fine under jsdom for everything this library actually needs to verify (option/attribute wiring, event forwarding); no browser is required. Two things worth knowing:
+
+- Some Leaflet DOM state (the `<img>`/`<video>` element behind an overlay, a marker's `dragging` handler) is only created in `onAdd()`, i.e. once the layer is actually added to a real map -- tests touching that state append through a `<leaflet-map>` rather than standalone.
+- `test/core/with-props.test.ts` covers the `WithProps` mixin itself against a fake Leaflet-like class (no real Leaflet needed for most of it) -- the one exception is child registration (popup/tooltip/layer binding), which needs real `Popup`/`Tooltip`/`Layer` instances because `#onChildRegister` discriminates by `instanceof`, not duck typing.
+
+`test/**` is excluded from the main `tsconfig.json` (so test code never ends up in `dist/`) and typechecked separately via `tsconfig.test.json`.
+
+To preview components in a real browser, open `index.html` with any static-file server.
 
 ## Architecture
 
diff --git a/oxlint.config.ts b/oxlint.config.ts
index 272f84a..321a827 100644
--- a/oxlint.config.ts
+++ b/oxlint.config.ts
@@ -11,6 +11,17 @@ export default defineConfig({
     'eslint/max-lines': 'off',
     'eslint/max-lines-per-function': 'off',
   },
+  overrides: [
+    {
+      // Each test scenario for the WithProps factory needs its own small
+      // custom element class -- that's the nature of testing a class factory,
+      // not a sign the file should be split up.
+      files: ['test/**/*.ts'],
+      rules: {
+        'eslint/max-classes-per-file': 'off',
+      },
+    },
+  ],
   env: {
     builtin: true,
   },
diff --git a/package-lock.json b/package-lock.json
index 41ecd42..fd08e5a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,9 +13,232 @@
       },
       "devDependencies": {
         "@types/leaflet": "1.9.21",
+        "jsdom": "^30.0.1",
         "oxlint": "^1.79.0",
         "prettier": "3.8.3",
-        "typescript": "^7.0.2"
+        "typescript": "^7.0.2",
+        "vitest": "^4.1.11"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "6.0.7",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-6.0.7.tgz",
+      "integrity": "sha512-vC/bk1Lz7Tn/EfU9/apOTBk80/8dyGyWMowPoV1tJ52muDGsDqt2HPT2klrFUiY60MQmQv9q8yIht15JnBgDGw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^3.3.0",
+        "@csstools/css-color-parser": "^4.1.10",
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.13.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "8.3.2",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-8.3.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "bidi-js": "^1.0.3",
+        "css-tree": "^3.2.1",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.13.0 || >=24.0.0"
+      }
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+    "node_modules/@bramus/specificity": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "css-tree": "^3.0.0"
+      },
+      "bin": {
+        "specificity": "bin/cli.js"
+      }
+    },
+    "node_modules/@csstools/color-helpers": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.1.1.tgz",
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+      "dev": true,
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.3.0.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
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+        "@csstools/css-tokenizer": "^4.0.0"
+      }
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+    "node_modules/@csstools/css-color-parser": {
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+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.2.0.tgz",
+      "integrity": "sha512-5+5LEmFuY1AjXdYhmgjTJogtQnP1evJ1zrBZGUNZ0thkpwnnmKxcHdAMn/OtFjAb25zA+jKDVYVRl+5G7rjv1A==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^6.1.1",
+        "@csstools/css-calc": "^3.3.0"
+      },
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-4.0.0.tgz",
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+      "dev": true,
+      "funding": [
+        {
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+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-syntax-patches-for-csstree": {
+      "version": "1.1.8",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.8.tgz",
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+      "dev": true,
+      "funding": [
+        {
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+          "url": "https://github.com/sponsors/csstools"
+        },
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+          "url": "https://opencollective.com/csstools"
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+      },
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+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@exodus/bytes": {
+      "version": "1.15.1",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.15.1.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@noble/hashes": "^1.8.0 || ^2.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@noble/hashes": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.5.5",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
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+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@oxc-project/types": {
+      "version": "0.146.0",
+      "resolved": "https://registry.npmjs.org/@oxc-project/types/-/types-0.146.0.tgz",
+      "integrity": "sha512-XC0QsnnhVe7sLIWmYmdPw7x5P0h4W8vUU3Nv1ySgWXtvCz8NizoAEpGXA0sOYoJQV2Rl13LgURAHQ5cI5ILCSA==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/Boshen"
       }
     },
     "node_modules/@oxlint/binding-android-arm-eabi": {
@@ -365,248 +588,356 @@
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       }
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-    "node_modules/@types/geojson": {
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-      "license": "MIT"
-    },
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-      "resolved": "https://registry.npmjs.org/@types/leaflet/-/leaflet-1.9.21.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@types/geojson": "*"
-      }
-    },
-    "node_modules/@typescript/typescript-aix-ppc64": {
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+    "node_modules/@rolldown/binding-android-arm-eabi": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/@rolldown/binding-android-arm-eabi/-/binding-android-arm-eabi-1.2.5.tgz",
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       "cpu": [
-        "ppc64"
+        "arm"
       ],
       "dev": true,
-      "license": "Apache-2.0",
+      "license": "MIT",
       "optional": true,
       "os": [
-        "aix"
+        "android"
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       "cpu": [
         "arm64"
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-      "license": "Apache-2.0",
+      "license": "MIT",
       "optional": true,
       "os": [
-        "darwin"
+        "android"
       ],
       "engines": {
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         "darwin"
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-        "arm64"
+        "x64"
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       "dev": true,
-      "license": "Apache-2.0",
+      "license": "MIT",
       "optional": true,
       "os": [
-        "freebsd"
+        "darwin"
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+      "integrity": "sha512-cFKLV/PRgAUlIRm5WjMjJ86jrftzpqcgH+Us+DS8mI3CDNiH30Whrz8uHL3+MOLPAgqbMBAqWdAHAphOAM+z/Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "lightningcss": "^1.33.0",
+        "picomatch": "^4.0.5",
+        "postcss": "^8.5.26",
+        "rolldown": "~1.2.4",
+        "tinyglobby": "^0.2.17"
+      },
+      "bin": {
+        "vite": "bin/vite.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || >=22.12.0"
+      },
+      "funding": {
+        "url": "https://github.com/vitejs/vite?sponsor=1"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.3"
+      },
+      "peerDependencies": {
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.4.0 || ^0.5.0",
+        "esbuild": "^0.27.0 || ^0.28.0",
+        "jiti": ">=1.21.0",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
+        "terser": "^5.16.0",
+        "tsx": "^4.8.1",
+        "yaml": "^2.4.2"
+      },
+      "peerDependenciesMeta": {
+        "@types/node": {
+          "optional": true
+        },
+        "@vitejs/devtools": {
+          "optional": true
+        },
+        "esbuild": {
+          "optional": true
+        },
+        "jiti": {
+          "optional": true
+        },
+        "less": {
+          "optional": true
+        },
+        "sass": {
+          "optional": true
+        },
+        "sass-embedded": {
+          "optional": true
+        },
+        "stylus": {
+          "optional": true
+        },
+        "sugarss": {
+          "optional": true
+        },
+        "terser": {
+          "optional": true
+        },
+        "tsx": {
+          "optional": true
+        },
+        "yaml": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/vitest": {
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/vitest/-/vitest-4.1.11.tgz",
+      "integrity": "sha512-fhACrNXUidIbGSBr5FlbuBkO7VWC1ZyLl0DO4CU2DrQoAPxX84Ysxs+HeGQpii5lZWV1Q4gBZTTu49mF+A6Edw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@vitest/expect": "4.1.11",
+        "@vitest/mocker": "4.1.11",
+        "@vitest/pretty-format": "4.1.11",
+        "@vitest/runner": "4.1.11",
+        "@vitest/snapshot": "4.1.11",
+        "@vitest/spy": "4.1.11",
+        "@vitest/utils": "4.1.11",
+        "es-module-lexer": "^2.0.0",
+        "expect-type": "^1.3.0",
+        "magic-string": "^0.30.21",
+        "obug": "^2.1.1",
+        "pathe": "^2.0.3",
+        "picomatch": "^4.0.3",
+        "std-env": "^4.0.0-rc.1",
+        "tinybench": "^2.9.0",
+        "tinyexec": "^1.0.2",
+        "tinyglobby": "^0.2.15",
+        "tinyrainbow": "^3.1.0",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0",
+        "why-is-node-running": "^2.3.0"
+      },
+      "bin": {
+        "vitest": "vitest.mjs"
+      },
+      "engines": {
+        "node": "^20.0.0 || ^22.0.0 || >=24.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/vitest"
+      },
+      "peerDependencies": {
+        "@edge-runtime/vm": "*",
+        "@opentelemetry/api": "^1.9.0",
+        "@types/node": "^20.0.0 || ^22.0.0 || >=24.0.0",
+        "@vitest/browser-playwright": "4.1.11",
+        "@vitest/browser-preview": "4.1.11",
+        "@vitest/browser-webdriverio": "4.1.11",
+        "@vitest/coverage-istanbul": "4.1.11",
+        "@vitest/coverage-v8": "4.1.11",
+        "@vitest/ui": "4.1.11",
+        "happy-dom": "*",
+        "jsdom": "*",
+        "vite": "^6.0.0 || ^7.0.0 || ^8.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@edge-runtime/vm": {
+          "optional": true
+        },
+        "@opentelemetry/api": {
+          "optional": true
+        },
+        "@types/node": {
+          "optional": true
+        },
+        "@vitest/browser-playwright": {
+          "optional": true
+        },
+        "@vitest/browser-preview": {
+          "optional": true
+        },
+        "@vitest/browser-webdriverio": {
+          "optional": true
+        },
+        "@vitest/coverage-istanbul": {
+          "optional": true
+        },
+        "@vitest/coverage-v8": {
+          "optional": true
+        },
+        "@vitest/ui": {
+          "optional": true
+        },
+        "happy-dom": {
+          "optional": true
+        },
+        "jsdom": {
+          "optional": true
+        },
+        "vite": {
+          "optional": false
+        }
+      }
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+      "integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+      "integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "17.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-17.1.0.tgz",
+      "integrity": "sha512-3GeworPmc2ZfEEHP7lEbUfBX/L75wdEsi0rLNhXcXxnoN5jyq0SL5gCy06SGW2cyTIZdTvWIDQNQoza++vKeaw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.15.1",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^22.14.0 || >=24.0.0"
+      }
+    },
+    "node_modules/why-is-node-running": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
+      "integrity": "sha512-hUrmaWBdVDcxvYqnyh09zunKzROWjbZTiNy8dBEjkS7ehEDQibXJ7XvlmtbwuTclUiIyN+CyXQD4Vmko8fNm8w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "siginfo": "^2.0.0",
+        "stackback": "0.0.2"
+      },
+      "bin": {
+        "why-is-node-running": "cli.js"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true,
+      "license": "MIT"
     }
   }
 }
diff --git a/package.json b/package.json
index 8d8d08c..7db4135 100644
--- a/package.json
+++ b/package.json
@@ -20,9 +20,11 @@
   ],
   "scripts": {
     "build": "rm -rf dist && tsc --outDir dist",
-    "typecheck": "tsc --noEmit",
-    "lint": "oxlint src",
-    "format": "prettier --write 'src/**/*.{ts,js,json,md}'",
+    "typecheck": "tsc --noEmit && tsc -p tsconfig.test.json",
+    "lint": "oxlint src test",
+    "format": "prettier --write 'src/**/*.{ts,js,json,md}' 'test/**/*.ts'",
+    "test": "vitest run",
+    "test:watch": "vitest",
     "prepublishOnly": "npm run build"
   },
   "keywords": [
@@ -38,8 +40,10 @@
   },
   "devDependencies": {
     "@types/leaflet": "1.9.21",
+    "jsdom": "^30.0.1",
     "oxlint": "^1.79.0",
     "prettier": "3.8.3",
-    "typescript": "^7.0.2"
+    "typescript": "^7.0.2",
+    "vitest": "^4.1.11"
   }
 }
diff --git a/src/core/shared-props.ts b/src/core/shared-props.ts
index bebf8a8..7defd2f 100644
--- a/src/core/shared-props.ts
+++ b/src/core/shared-props.ts
@@ -24,7 +24,6 @@ export interface Styleable {
 
 export interface Sourced {
   setUrl(url: string): unknown;
-  getUrl?(): string;
 }
 
 export interface Bounded {
@@ -56,14 +55,12 @@ export function style<T>(key: keyof PathOptions): (obj: Styleable, value: T) =>
 
 // The source url. Passed positionally by every Leaflet constructor that takes
 // one, and ignored when blank so clearing the attribute can't request nothing.
+// No `get`: none of TileLayer/ImageOverlay/VideoOverlay expose a getUrl().
 export const urlProp = positional(
   str<Sourced>('', {
     set(obj, value) {
       if (value) obj.setUrl(value);
     },
-    // Only ImageOverlay/VideoOverlay implement getUrl(); TileLayer doesn't,
-    // so this falls back to the attribute there, same as omitting `get`.
-    get: (obj) => obj.getUrl?.(),
   }),
 );
 
diff --git a/test/components/controls-and-groups.test.ts b/test/components/controls-and-groups.test.ts
new file mode 100644
index 0000000..6a8d3c1
--- /dev/null
+++ b/test/components/controls-and-groups.test.ts
@@ -0,0 +1,101 @@
+import { Control, FeatureGroup, LayerGroup } from 'leaflet';
+import { describe, expect, it } from 'vitest';
+import '../../src/components/leaflet-control-zoom.ts';
+import '../../src/components/leaflet-control-scale.ts';
+import '../../src/components/leaflet-control-attribution.ts';
+import '../../src/components/leaflet-control-layers.ts';
+import '../../src/components/leaflet-tile-layer.ts';
+import '../../src/components/leaflet-layer-group.ts';
+import '../../src/components/leaflet-feature-group.ts';
+import '../../src/components/leaflet-marker.ts';
+
+describe('leaflet-control-zoom / scale / attribution', () => {
+  it('create their matching Control class with position and options', () => {
+    const zoom = document.createElement('leaflet-control-zoom') as HTMLElement & {
+      leafletObject?: Control.Zoom;
+    };
+    zoom.setAttribute('position', 'bottomleft');
+    document.body.append(zoom);
+    expect(zoom.leafletObject).toBeInstanceOf(Control.Zoom);
+    expect(zoom.leafletObject?.options.position).toBe('bottomleft');
+    zoom.remove();
+
+    const scale = document.createElement('leaflet-control-scale') as HTMLElement & {
+      leafletObject?: Control.Scale;
+    };
+    scale.setAttribute('max-width', '150');
+    document.body.append(scale);
+    expect(scale.leafletObject).toBeInstanceOf(Control.Scale);
+    expect(scale.leafletObject?.options.maxWidth).toBe(150);
+    scale.remove();
+
+    const attribution = document.createElement('leaflet-control-attribution') as HTMLElement & {
+      leafletObject?: Control.Attribution;
+    };
+    attribution.setAttribute('prefix', 'Test');
+    document.body.append(attribution);
+    expect(attribution.leafletObject).toBeInstanceOf(Control.Attribution);
+    expect(attribution.leafletObject?.options.prefix).toBe('Test');
+    attribution.remove();
+  });
+});
+
+describe('leaflet-control-layers', () => {
+  it('sorts existing children into base layers vs overlays by the type attribute', () => {
+    const el = document.createElement('leaflet-control-layers') as HTMLElement & {
+      leafletObject?: Control.Layers;
+    };
+    const base = document.createElement('leaflet-tile-layer');
+    base.setAttribute('url', 'https://a.example/{z}/{x}/{y}.png');
+    base.setAttribute('name', 'Base');
+    base.setAttribute('type', 'base');
+    base.setAttribute('active', '');
+
+    const overlay = document.createElement('leaflet-tile-layer');
+    overlay.setAttribute('url', 'https://b.example/{z}/{x}/{y}.png');
+    overlay.setAttribute('name', 'Overlay');
+
+    el.append(base, overlay);
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Control.Layers);
+    // Control.Layers has no public getter for its layer list, so this reaches
+    // into Leaflet's own private `_layers` field -- brittle across Leaflet
+    // versions, but it's the only way to verify the base/overlay split.
+    const layersInternal = el.leafletObject as unknown as {
+      _layers: { name: string; overlay?: boolean }[];
+    };
+    const byName = Object.fromEntries(
+      // oxlint-disable-next-line no-underscore-dangle -- Leaflet's own field name
+      layersInternal._layers.map((l) => [l.name, Boolean(l.overlay)]),
+    );
+    expect(byName['Base']).toBe(false);
+    expect(byName['Overlay']).toBe(true);
+    el.remove();
+  });
+});
+
+describe('leaflet-layer-group / leaflet-feature-group', () => {
+  it('are passthrough WithProps({}) containers that adopt registering children', () => {
+    const group = document.createElement('leaflet-layer-group') as HTMLElement & {
+      leafletObject?: LayerGroup;
+    };
+    document.body.append(group);
+    expect(group.leafletObject).toBeInstanceOf(LayerGroup);
+
+    const marker = document.createElement('leaflet-marker');
+    marker.setAttribute('lat', '1');
+    marker.setAttribute('lng', '2');
+    group.append(marker);
+
+    expect(group.leafletObject?.getLayers()).toHaveLength(1);
+    group.remove();
+
+    const feature = document.createElement('leaflet-feature-group') as HTMLElement & {
+      leafletObject?: FeatureGroup;
+    };
+    document.body.append(feature);
+    expect(feature.leafletObject).toBeInstanceOf(FeatureGroup);
+    feature.remove();
+  });
+});
diff --git a/test/components/geojson.test.ts b/test/components/geojson.test.ts
new file mode 100644
index 0000000..29b9212
--- /dev/null
+++ b/test/components/geojson.test.ts
@@ -0,0 +1,56 @@
+import { GeoJSON } from 'leaflet';
+import { describe, expect, it } from 'vitest';
+import '../../src/components/leaflet-geojson.ts';
+
+const FEATURE = {
+  type: 'Feature',
+  geometry: {
+    type: 'Polygon',
+    coordinates: [
+      [
+        [-0.13, 51.5],
+        [-0.12, 51.5],
+        [-0.12, 51.51],
+        [-0.13, 51.51],
+        [-0.13, 51.5],
+      ],
+    ],
+  },
+  properties: {},
+};
+
+describe('leaflet-geojson', () => {
+  it('builds a GeoJSON layer from the data attribute with pathProps nested as style', () => {
+    const el = document.createElement('leaflet-geojson') as HTMLElement & {
+      leafletObject?: GeoJSON;
+    };
+    el.setAttribute('data', JSON.stringify(FEATURE));
+    el.setAttribute('color', '#e67e22');
+    el.setAttribute('fill-opacity', '0.4');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(GeoJSON);
+    expect(el.leafletObject?.getLayers()).toHaveLength(1);
+
+    const style = el.leafletObject?.options.style as { color?: string; fillOpacity?: number };
+    expect(style.color).toBe('#e67e22');
+    expect(style.fillOpacity).toBe(0.4);
+    el.remove();
+  });
+
+  it('replaces its layers when the data attribute changes', () => {
+    const el = document.createElement('leaflet-geojson') as HTMLElement & {
+      leafletObject?: GeoJSON;
+    };
+    el.setAttribute('data', JSON.stringify(FEATURE));
+    document.body.append(el);
+    expect(el.leafletObject?.getLayers()).toHaveLength(1);
+
+    el.setAttribute(
+      'data',
+      JSON.stringify({ type: 'FeatureCollection', features: [FEATURE, FEATURE] }),
+    );
+    expect(el.leafletObject?.getLayers()).toHaveLength(2);
+    el.remove();
+  });
+});
diff --git a/test/components/icons.test.ts b/test/components/icons.test.ts
new file mode 100644
index 0000000..995caa0
--- /dev/null
+++ b/test/components/icons.test.ts
@@ -0,0 +1,62 @@
+import { DivIcon, Icon } from 'leaflet';
+import { describe, expect, it, vi } from 'vitest';
+import '../../src/components/leaflet-icon.ts';
+import '../../src/components/leaflet-div-icon.ts';
+
+describe('leaflet-icon', () => {
+  it('creates nothing until icon-url is set, then an Icon once it is', () => {
+    const el = document.createElement('leaflet-icon') as HTMLElement & {
+      leafletObject?: Icon;
+    };
+    document.body.append(el);
+    expect(el.leafletObject).toBeUndefined();
+
+    el.setAttribute('icon-url', 'https://example.com/icon.png');
+    expect(el.leafletObject).toBeInstanceOf(Icon);
+    expect(el.leafletObject?.options.iconUrl).toBe('https://example.com/icon.png');
+    el.remove();
+  });
+
+  it('rebuilds (not mutates) the Icon on every attribute change and re-emits icon-changed', () => {
+    const el = document.createElement('leaflet-icon') as HTMLElement & {
+      leafletObject?: Icon;
+    };
+    el.setAttribute('icon-url', 'https://example.com/a.png');
+    const onChanged = vi.fn();
+    el.addEventListener('icon-changed', onChanged);
+    document.body.append(el);
+
+    const first = el.leafletObject;
+    onChanged.mockClear();
+    el.setAttribute('icon-size', JSON.stringify([32, 32]));
+
+    expect(el.leafletObject).not.toBe(first);
+    expect(onChanged).toHaveBeenCalledOnce();
+    el.remove();
+  });
+});
+
+describe('leaflet-div-icon', () => {
+  it('defaults className to Leaflet’s own default and renders markup as html', () => {
+    const el = document.createElement('leaflet-div-icon') as HTMLElement & {
+      leafletObject?: DivIcon;
+    };
+    el.innerHTML = '<span>*</span>';
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(DivIcon);
+    expect(el.leafletObject?.options.className).toBe('leaflet-div-icon');
+    expect(el.leafletObject?.options.html).toBe('<span>*</span>');
+    el.remove();
+  });
+
+  it('emits icon-changed(null) on disconnect', () => {
+    const el = document.createElement('leaflet-div-icon');
+    document.body.append(el);
+    const onChanged = vi.fn();
+    el.addEventListener('icon-changed', onChanged);
+    el.remove();
+    expect(onChanged).toHaveBeenCalledOnce();
+    expect((onChanged.mock.calls[0][0] as CustomEvent).detail.icon).toBeNull();
+  });
+});
diff --git a/test/components/latlng-bindables.test.ts b/test/components/latlng-bindables.test.ts
new file mode 100644
index 0000000..c9b50fd
--- /dev/null
+++ b/test/components/latlng-bindables.test.ts
@@ -0,0 +1,126 @@
+import { Marker, Popup, Tooltip } from 'leaflet';
+import { describe, expect, it } from 'vitest';
+import '../../src/components/leaflet-map.ts';
+import '../../src/components/leaflet-marker.ts';
+import '../../src/components/leaflet-popup.ts';
+import '../../src/components/leaflet-tooltip.ts';
+import '../../src/components/leaflet-icon.ts';
+
+describe('leaflet-marker', () => {
+  it('creates a Marker at lat/lng and keeps lat/lng synced while it moves', () => {
+    const el = document.createElement('leaflet-marker') as HTMLElement & {
+      leafletObject?: Marker;
+      lat: number;
+      lng: number;
+    };
+    el.setAttribute('lat', '51.5');
+    el.setAttribute('lng', '-0.09');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Marker);
+    expect(el.leafletObject?.getLatLng()).toMatchObject({ lat: 51.5, lng: -0.09 });
+
+    el.leafletObject?.setLatLng([1, 2]);
+    expect(el.lat).toBe(1);
+    expect(el.lng).toBe(2);
+    // event: 'move' syncs the attribute too
+    expect(el.getAttribute('lat')).toBe('1');
+    expect(el.getAttribute('lng')).toBe('2');
+    el.remove();
+  });
+
+  it('draggable toggles the Leaflet dragging handler', () => {
+    // The dragging handler is only initialized in onAdd(), so the marker
+    // needs to actually be added to a map first.
+    const map = document.createElement('leaflet-map');
+    document.body.append(map);
+
+    const el = document.createElement('leaflet-marker') as HTMLElement & {
+      leafletObject?: Marker;
+    };
+    el.setAttribute('lat', '0');
+    el.setAttribute('lng', '0');
+    el.setAttribute('draggable', '');
+    map.append(el);
+
+    expect(el.leafletObject?.dragging?.enabled()).toBe(true);
+    el.removeAttribute('draggable');
+    expect(el.leafletObject?.dragging?.enabled()).toBe(false);
+    map.remove();
+  });
+
+  it('swaps in a <leaflet-icon> child via the icon-changed handshake', () => {
+    const el = document.createElement('leaflet-marker') as HTMLElement & {
+      leafletObject?: Marker;
+    };
+    el.setAttribute('lat', '0');
+    el.setAttribute('lng', '0');
+    document.body.append(el);
+
+    const icon = document.createElement('leaflet-icon');
+    icon.setAttribute('icon-url', 'https://example.com/icon.png');
+    el.append(icon);
+
+    expect(el.leafletObject?.options.icon).toBe(
+      (icon as HTMLElement & { leafletObject?: unknown }).leafletObject,
+    );
+    el.remove();
+  });
+});
+
+describe('leaflet-popup', () => {
+  it('takes its content from innerHTML and stays in sync on mutation', async () => {
+    const el = document.createElement('leaflet-popup') as HTMLElement & {
+      leafletObject?: Popup;
+    };
+    el.innerHTML = '<b>hello</b>';
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Popup);
+    expect(el.leafletObject?.getContent()).toBe('<b>hello</b>');
+
+    el.innerHTML = '<b>updated</b>';
+    // MutationObserver callbacks run as a microtask.
+    await Promise.resolve();
+    expect(el.leafletObject?.getContent()).toBe('<b>updated</b>');
+    el.remove();
+  });
+
+  it('only sets its own latlng when lat/lng attributes are present', () => {
+    const withLatLng = document.createElement('leaflet-popup') as HTMLElement & {
+      leafletObject?: Popup;
+    };
+    withLatLng.setAttribute('lat', '1');
+    withLatLng.setAttribute('lng', '2');
+    document.body.append(withLatLng);
+    expect(withLatLng.leafletObject?.getLatLng()).toMatchObject({ lat: 1, lng: 2 });
+    withLatLng.remove();
+
+    const withoutLatLng = document.createElement('leaflet-popup') as HTMLElement & {
+      leafletObject?: Popup;
+    };
+    document.body.append(withoutLatLng);
+    expect(withoutLatLng.leafletObject?.getLatLng()).toBeUndefined();
+    withoutLatLng.remove();
+  });
+});
+
+describe('leaflet-tooltip', () => {
+  it('creates a Tooltip with content and direction/permanent/sticky options', () => {
+    const el = document.createElement('leaflet-tooltip') as HTMLElement & {
+      leafletObject?: Tooltip;
+    };
+    el.innerHTML = 'hover text';
+    el.setAttribute('direction', 'top');
+    el.setAttribute('permanent', '');
+    el.setAttribute('sticky', '');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Tooltip);
+    expect(el.leafletObject?.getContent()).toBe('hover text');
+    expect(el.leafletObject?.options.direction).toBe('top');
+    expect(el.leafletObject?.options.permanent).toBe(true);
+    expect(el.leafletObject?.options.sticky).toBe(true);
+    el.remove();
+  });
+});
diff --git a/test/components/overlays.test.ts b/test/components/overlays.test.ts
new file mode 100644
index 0000000..7990f50
--- /dev/null
+++ b/test/components/overlays.test.ts
@@ -0,0 +1,100 @@
+import { ImageOverlay, SVGOverlay, VideoOverlay, latLngBounds } from 'leaflet';
+import { describe, expect, it } from 'vitest';
+import '../../src/components/leaflet-map.ts';
+import '../../src/components/leaflet-image-overlay.ts';
+import '../../src/components/leaflet-video-overlay.ts';
+import '../../src/components/leaflet-svg-overlay.ts';
+
+const BOUNDS: [[number, number], [number, number]] = [
+  [40.71, -74.24],
+  [40.78, -74.12],
+];
+
+describe('leaflet-image-overlay', () => {
+  it('creates an ImageOverlay with a live bounds getter (url has no Leaflet getter to read back)', () => {
+    const el = document.createElement('leaflet-image-overlay') as HTMLElement & {
+      leafletObject?: ImageOverlay;
+      url: string;
+      bounds: unknown;
+    };
+    el.setAttribute('url', 'https://example.com/a.png');
+    el.setAttribute('bounds', JSON.stringify(BOUNDS));
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(ImageOverlay);
+    expect(el.url).toBe('https://example.com/a.png');
+    expect(el.bounds).toEqual(BOUNDS);
+
+    el.leafletObject?.setBounds(
+      latLngBounds([
+        [1, 2],
+        [3, 4],
+      ]),
+    );
+    // el.bounds reads live via getBounds()
+    expect(el.bounds).toEqual([
+      [1, 2],
+      [3, 4],
+    ]);
+    el.remove();
+  });
+});
+
+describe('leaflet-video-overlay', () => {
+  it('creates a VideoOverlay and applies the newly added options', () => {
+    const el = document.createElement('leaflet-video-overlay') as HTMLElement & {
+      leafletObject?: VideoOverlay;
+    };
+    el.setAttribute('url', 'https://example.com/a.mp4');
+    el.setAttribute('bounds', JSON.stringify(BOUNDS));
+    el.setAttribute('z-index', '5');
+    el.setAttribute('class-name', 'my-video');
+    el.setAttribute('keep-aspect-ratio', 'false');
+    el.setAttribute('error-overlay-url', 'https://example.com/error.png');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(VideoOverlay);
+    expect(el.leafletObject?.options.zIndex).toBe(5);
+    expect(el.leafletObject?.options.className).toBe('my-video');
+    expect(el.leafletObject?.options.keepAspectRatio).toBe(false);
+    expect(el.leafletObject?.options.errorOverlayUrl).toBe('https://example.com/error.png');
+    el.remove();
+  });
+
+  it('applies playback attributes directly to the underlying <video> element once it exists', () => {
+    // The <video> element is only created in onAdd(), so the overlay needs to
+    // actually be added to a map before getElement() returns anything.
+    const map = document.createElement('leaflet-map');
+    document.body.append(map);
+
+    const el = document.createElement('leaflet-video-overlay') as HTMLElement & {
+      leafletObject?: VideoOverlay;
+      getElement(): HTMLVideoElement | undefined;
+    };
+    el.setAttribute('url', 'https://example.com/a.mp4');
+    el.setAttribute('bounds', JSON.stringify(BOUNDS));
+    el.setAttribute('muted', '');
+    el.setAttribute('loop', '');
+    map.append(el);
+
+    const video = el.getElement();
+    expect(video?.muted).toBe(true);
+    expect(video?.loop).toBe(true);
+    map.remove();
+  });
+});
+
+describe('leaflet-svg-overlay', () => {
+  it('creates an SVGOverlay with a live bounds getter', () => {
+    const el = document.createElement('leaflet-svg-overlay') as HTMLElement & {
+      leafletObject?: SVGOverlay;
+      bounds: unknown;
+    };
+    el.setAttribute('bounds', JSON.stringify(BOUNDS));
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(SVGOverlay);
+    expect(el.bounds).toEqual(BOUNDS);
+    el.remove();
+  });
+});
diff --git a/test/components/shapes.test.ts b/test/components/shapes.test.ts
new file mode 100644
index 0000000..40b69c9
--- /dev/null
+++ b/test/components/shapes.test.ts
@@ -0,0 +1,147 @@
+import { Circle, CircleMarker, Polygon, Polyline, Rectangle } from 'leaflet';
+import { describe, expect, it } from 'vitest';
+import '../../src/components/leaflet-circle.ts';
+import '../../src/components/leaflet-circle-marker.ts';
+import '../../src/components/leaflet-rectangle.ts';
+import '../../src/components/leaflet-polygon.ts';
+import '../../src/components/leaflet-polyline.ts';
+import '../../src/components/leaflet-line.ts';
+
+describe('leaflet-circle', () => {
+  it('creates a Circle at lat/lng with radius and pathProps applied', () => {
+    const el = document.createElement('leaflet-circle') as HTMLElement & {
+      leafletObject?: Circle;
+      radius: number;
+    };
+    el.setAttribute('lat', '51.5');
+    el.setAttribute('lng', '-0.09');
+    el.setAttribute('radius', '500');
+    el.setAttribute('color', 'red');
+    el.setAttribute('interactive', 'false');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Circle);
+    expect(el.leafletObject?.getLatLng()).toMatchObject({ lat: 51.5, lng: -0.09 });
+    expect(el.leafletObject?.getRadius()).toBe(500);
+    expect(el.leafletObject?.options.color).toBe('red');
+    expect(el.leafletObject?.options.interactive).toBe(false);
+    el.remove();
+  });
+
+  it('radius property reads the live value and reacts to attribute changes', () => {
+    const el = document.createElement('leaflet-circle') as HTMLElement & {
+      leafletObject?: Circle;
+      radius: number;
+    };
+    document.body.append(el);
+    // Leaflet's own default, no attribute set
+    expect(el.radius).toBe(1000);
+
+    el.setAttribute('radius', '750');
+    expect(el.leafletObject?.getRadius()).toBe(750);
+    expect(el.radius).toBe(750);
+
+    // Change bypassing the attribute entirely.
+    el.leafletObject?.setRadius(42);
+    // Property getter still reflects Leaflet's live state.
+    expect(el.radius).toBe(42);
+    el.remove();
+  });
+});
+
+describe('leaflet-circle-marker', () => {
+  it('creates a CircleMarker with a live radius getter', () => {
+    const el = document.createElement('leaflet-circle-marker') as HTMLElement & {
+      leafletObject?: CircleMarker;
+      radius: number;
+    };
+    el.setAttribute('lat', '1');
+    el.setAttribute('lng', '2');
+    el.setAttribute('radius', '15');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(CircleMarker);
+    expect(el.leafletObject?.getRadius()).toBe(15);
+    el.leafletObject?.setRadius(30);
+    expect(el.radius).toBe(30);
+    el.remove();
+  });
+});
+
+describe('leaflet-rectangle', () => {
+  it('creates a Rectangle from the bounds attribute with a live bounds getter', () => {
+    const el = document.createElement('leaflet-rectangle') as HTMLElement & {
+      leafletObject?: Rectangle;
+      bounds: [[number, number], [number, number]];
+    };
+    el.setAttribute(
+      'bounds',
+      JSON.stringify([
+        [51.49, -0.08],
+        [51.5, -0.06],
+      ]),
+    );
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Rectangle);
+    expect(el.bounds).toEqual([
+      [51.49, -0.08],
+      [51.5, -0.06],
+    ]);
+    el.remove();
+  });
+});
+
+describe('leaflet-polygon', () => {
+  it('collects vertices from <leaflet-line> children and updates on change', () => {
+    const el = document.createElement('leaflet-polygon') as HTMLElement & {
+      leafletObject?: Polygon;
+    };
+    const line1 = document.createElement('leaflet-line');
+    line1.setAttribute('lat', '1');
+    line1.setAttribute('lng', '2');
+    const line2 = document.createElement('leaflet-line');
+    line2.setAttribute('lat', '3');
+    line2.setAttribute('lng', '4');
+    el.append(line1, line2);
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Polygon);
+    expect(el.leafletObject?.getLatLngs()).toEqual([
+      [
+        { lat: 1, lng: 2 },
+        { lat: 3, lng: 4 },
+      ],
+    ]);
+
+    line1.setAttribute('lat', '9');
+    expect(el.leafletObject?.getLatLngs()).toEqual([
+      [
+        { lat: 9, lng: 2 },
+        { lat: 3, lng: 4 },
+      ],
+    ]);
+    el.remove();
+  });
+});
+
+describe('leaflet-polyline', () => {
+  it('applies smoothFactor/noClip and is unfilled by default', () => {
+    const el = document.createElement('leaflet-polyline') as HTMLElement & {
+      leafletObject?: Polyline;
+    };
+    el.setAttribute('smooth-factor', '2.5');
+    el.setAttribute('no-clip', '');
+    const line = document.createElement('leaflet-line');
+    line.setAttribute('lat', '1');
+    line.setAttribute('lng', '2');
+    el.append(line);
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(Polyline);
+    expect(el.leafletObject?.options.smoothFactor).toBe(2.5);
+    expect(el.leafletObject?.options.noClip).toBe(true);
+    expect(el.leafletObject?.options.fill).toBe(false);
+    el.remove();
+  });
+});
diff --git a/test/components/tile-layers.test.ts b/test/components/tile-layers.test.ts
new file mode 100644
index 0000000..f944b24
--- /dev/null
+++ b/test/components/tile-layers.test.ts
@@ -0,0 +1,68 @@
+import { TileLayer } from 'leaflet';
+import { describe, expect, it } from 'vitest';
+import '../../src/components/leaflet-tile-layer.ts';
+import '../../src/components/leaflet-tile-layer-wms.ts';
+
+describe('leaflet-tile-layer', () => {
+  it('creates a TileLayer from the url attribute with tileLayerProps options', () => {
+    const el = document.createElement('leaflet-tile-layer') as HTMLElement & {
+      leafletObject?: TileLayer;
+    };
+    el.setAttribute('url', 'https://tile.example/{z}/{x}/{y}.png');
+    el.setAttribute('subdomains', 'abcd');
+    el.setAttribute('tms', '');
+    el.setAttribute('max-native-zoom', '17');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(TileLayer);
+    // Leaflet itself splits a string subdomains option into a character array.
+    expect(el.leafletObject?.options.subdomains).toEqual(['a', 'b', 'c', 'd']);
+    expect(el.leafletObject?.options.tms).toBe(true);
+    expect(el.leafletObject?.options.maxNativeZoom).toBe(17);
+    el.remove();
+  });
+
+  it('defaults zIndex to 1, matching Leaflet', () => {
+    const el = document.createElement('leaflet-tile-layer') as HTMLElement & {
+      leafletObject?: TileLayer;
+      zIndex: number;
+    };
+    el.setAttribute('url', 'https://tile.example/{z}/{x}/{y}.png');
+    document.body.append(el);
+    expect(el.leafletObject?.options.zIndex).toBe(1);
+    el.remove();
+  });
+});
+
+describe('leaflet-tile-layer-wms', () => {
+  it('shares base tileLayerProps with leaflet-tile-layer (previously missing entirely)', () => {
+    const el = document.createElement('leaflet-tile-layer-wms') as HTMLElement & {
+      leafletObject?: TileLayer.WMS;
+    };
+    el.setAttribute('url', 'https://wms.example/service');
+    el.setAttribute('layers', 'basic');
+    el.setAttribute('attribution', 'Example');
+    el.setAttribute('min-zoom', '2');
+    document.body.append(el);
+
+    expect(el.leafletObject).toBeInstanceOf(TileLayer.WMS);
+    expect(el.leafletObject?.options.attribution).toBe('Example');
+    expect(el.leafletObject?.options.minZoom).toBe(2);
+    expect(el.leafletObject?.wmsParams.layers).toBe('basic');
+    el.remove();
+  });
+
+  it('resolves crs by name to the matching Leaflet CRS instance', async () => {
+    const { CRS } = await import('leaflet');
+    const el = document.createElement('leaflet-tile-layer-wms') as HTMLElement & {
+      leafletObject?: TileLayer.WMS;
+    };
+    el.setAttribute('url', 'https://wms.example/service');
+    el.setAttribute('layers', 'basic');
+    el.setAttribute('crs', 'EPSG4326');
+    document.body.append(el);
+
+    expect(el.leafletObject?.options.crs).toBe(CRS.EPSG4326);
+    el.remove();
+  });
+});
diff --git a/test/core/props.test.ts b/test/core/props.test.ts
new file mode 100644
index 0000000..12f9e29
--- /dev/null
+++ b/test/core/props.test.ts
@@ -0,0 +1,112 @@
+import { describe, expect, it } from 'vitest';
+import { bool, choice, disabled, json, kebab, num, positional, str } from '../../src/core/props.ts';
+
+const noopGet = () => 1;
+
+describe('kebab', () => {
+  it('converts camelCase to kebab-case', () => {
+    expect(kebab('fillColor')).toBe('fill-color');
+    expect(kebab('zIndex')).toBe('z-index');
+    expect(kebab('zIndexOffset')).toBe('z-index-offset');
+  });
+
+  it('leaves single lowercase words unchanged', () => {
+    expect(kebab('opacity')).toBe('opacity');
+  });
+});
+
+describe('num', () => {
+  it('defaults to 0 and decodes/encodes via Number/String', () => {
+    const def = num();
+    expect(def.default).toBe(0);
+    expect(def.decode('42')).toBe(42);
+    expect(def.encode(42)).toBe('42');
+  });
+
+  it('accepts a custom default and passes through extra opts', () => {
+    const def = num(10, { get: noopGet });
+    expect(def.default).toBe(10);
+    expect(def.get).toBe(noopGet);
+  });
+});
+
+describe('str', () => {
+  it('defaults to empty string and decode/encode are identity', () => {
+    const def = str();
+    expect(def.default).toBe('');
+    expect(def.decode('hello')).toBe('hello');
+    expect(def.encode('hello')).toBe('hello');
+  });
+});
+
+describe('choice', () => {
+  it('decode/encode are identity, typed as the literal union', () => {
+    const def = choice<'a' | 'b'>('a');
+    expect(def.default).toBe('a');
+    expect(def.decode('b')).toBe('b');
+    expect(def.encode('b')).toBe('b');
+  });
+});
+
+describe('bool', () => {
+  it('decodes any value other than the literal string "false" as true', () => {
+    const def = bool();
+    expect(def.decode('')).toBe(true);
+    expect(def.decode('true')).toBe(true);
+    expect(def.decode('anything')).toBe(true);
+    expect(def.decode('false')).toBe(false);
+  });
+
+  it('encode returns null when the value matches the default (removes the attribute)', () => {
+    const defFalse = bool(false);
+    expect(defFalse.encode(false)).toBeNull();
+    expect(defFalse.encode(true)).toBe('');
+
+    const defTrue = bool(true);
+    expect(defTrue.encode(true)).toBeNull();
+    expect(defTrue.encode(false)).toBe('false');
+  });
+});
+
+describe('disabled', () => {
+  it('names its attribute disable-<kebab-name>', () => {
+    const def = disabled();
+    expect(def.attribute).toBeTypeOf('function');
+    expect((def.attribute as (name: string) => string)('dragging')).toBe('disable-dragging');
+  });
+
+  it('defaults to true (enabled); presence of the attribute disables unless its value is "false"', () => {
+    const def = disabled();
+    expect(def.default).toBe(true);
+    // Bare `disable-foo` (raw === '') means "disable this" -> false.
+    expect(def.decode('')).toBe(false);
+    expect(def.decode('anything')).toBe(false);
+    // `disable-foo="false"` is a double-negative escape hatch -> stays enabled.
+    expect(def.decode('false')).toBe(true);
+  });
+
+  it('encodes false as a present attribute, true as absent', () => {
+    const def = disabled();
+    expect(def.encode(true)).toBeNull();
+    expect(def.encode(false)).toBe('');
+  });
+});
+
+describe('json', () => {
+  it('decodes via JSON.parse and encodes via JSON.stringify', () => {
+    const def = json<{ a: number }>({ a: 0 });
+    expect(def.decode('{"a":5}')).toEqual({ a: 5 });
+    expect(def.encode({ a: 5 })).toBe('{"a":5}');
+  });
+});
+
+describe('positional', () => {
+  it('adds option: false while preserving every other field', () => {
+    const base = num(5, { get: () => 1 });
+    const pos = positional(base);
+    expect(pos.option).toBe(false);
+    expect(pos.default).toBe(5);
+    expect(pos.get).toBe(base.get);
+    expect(pos.decode).toBe(base.decode);
+  });
+});
diff --git a/test/core/with-props.test.ts b/test/core/with-props.test.ts
new file mode 100644
index 0000000..322ea00
--- /dev/null
+++ b/test/core/with-props.test.ts
@@ -0,0 +1,481 @@
+import { Marker, Popup, Tooltip } from 'leaflet';
+import { describe, expect, it, vi } from 'vitest';
+import { num, positional, str, type PropOptionValues } from '../../src/core/props.ts';
+import { WithProps, type LeafletElementConstructor } from '../../src/core/with-props.ts';
+import type { LeafletRegisterEvent } from '../../src/core/register.ts';
+
+// A minimal stand-in for a Leaflet object: duck-typed setters/getters plus the
+// on/off/fire trio WithProps needs to watch and forward events. None of the
+// tests in this file need real Leaflet -- WithProps only calls methods by
+// name, it never checks `instanceof` -- except the child-registration group
+// at the bottom, which exercises #onChildRegister's real `instanceof
+// Popup/Tooltip/Layer` checks and so needs real Leaflet objects.
+class FakeObj {
+  radius = 0;
+  opacity = 1;
+  removed = false;
+  #listeners = new Map<string, Set<(data?: unknown) => void>>();
+
+  setRadius(v: number): void {
+    this.radius = v;
+  }
+  getRadius(): number {
+    return this.radius;
+  }
+  setOpacity(v: number): void {
+    this.opacity = v;
+  }
+  bindPopup(): void {}
+  unbindPopup(): void {}
+  bindTooltip(): void {}
+  unbindTooltip(): void {}
+  addLayer(): void {}
+  removeLayer(): void {}
+
+  on(type: string, handler: (data?: unknown) => void): this {
+    let set = this.#listeners.get(type);
+    if (!set) {
+      set = new Set();
+      this.#listeners.set(type, set);
+    }
+    set.add(handler);
+    return this;
+  }
+  off(type: string, handler: (data?: unknown) => void): this {
+    this.#listeners.get(type)?.delete(handler);
+    return this;
+  }
+  fire(type: string, data?: unknown): this {
+    for (const handler of this.#listeners.get(type) ?? []) handler(data);
+    return this;
+  }
+  remove(): void {
+    this.removed = true;
+  }
+}
+
+const BASE_PROPS = {
+  radius: num<FakeObj>(5, { get: (obj) => obj.getRadius() }),
+  opacity: num<FakeObj>(1),
+} as const;
+
+function define(
+  tag: string,
+  props: Parameters<typeof WithProps>[0] = BASE_PROPS,
+  elementOptions?: Parameters<typeof WithProps>[1],
+): {
+  Ctor: LeafletElementConstructor<FakeObj, typeof props>;
+  create: ReturnType<typeof vi.fn<(options: PropOptionValues<typeof props>) => FakeObj>>;
+} {
+  const create = vi.fn((options: PropOptionValues<typeof props>) => {
+    const obj = new FakeObj();
+    const opts = options as { radius?: number; opacity?: number };
+    if (opts.radius !== undefined) obj.setRadius(opts.radius);
+    if (opts.opacity !== undefined) obj.setOpacity(opts.opacity);
+    return obj;
+  });
+  class El extends WithProps<FakeObj, typeof props>(props, elementOptions) {
+    createLeafletObject(opts: PropOptionValues<typeof props>): FakeObj {
+      return create(opts);
+    }
+  }
+  customElements.define(tag, El);
+  return { Ctor: El as unknown as LeafletElementConstructor<FakeObj, typeof props>, create };
+}
+
+function childRegisterEvent(el: HTMLElement, leafletObject: unknown): LeafletRegisterEvent {
+  return new CustomEvent('leaflet-register', {
+    bubbles: true,
+    composed: true,
+    detail: { leafletObject, element: el },
+  }) as LeafletRegisterEvent;
+}
+
+describe('WithProps: observedAttributes', () => {
+  it('kebab-cases prop names and derives them from the PROPS table', () => {
+    const props = { fooBar: str<FakeObj>('x'), radius: num<FakeObj>(0) } as const;
+    class El extends WithProps<FakeObj, typeof props>(props) {
+      createLeafletObject(): FakeObj {
+        return new FakeObj();
+      }
+    }
+    customElements.define('wp-observed-attrs', El);
+    expect((El as unknown as { observedAttributes: string[] }).observedAttributes).toEqual([
+      'foo-bar',
+      'radius',
+    ]);
+  });
+});
+
+describe('WithProps: creation and options', () => {
+  it('builds the options object only from present attributes, decoded', () => {
+    const { Ctor, create } = define('wp-create-options');
+    const el = document.createElement('wp-create-options') as InstanceType<typeof Ctor>;
+    el.setAttribute('radius', '20');
+    document.body.append(el);
+
+    expect(create).toHaveBeenCalledWith({ radius: 20 });
+    expect(el.leafletObject).toBeInstanceOf(FakeObj);
+    el.remove();
+  });
+
+  it('omits props with option:false (positional) from the options object', () => {
+    const props = { radius: positional(num<FakeObj>(5)), opacity: num<FakeObj>(1) } as const;
+    const create = vi.fn((_o: PropOptionValues<typeof props>) => new FakeObj());
+    class El extends WithProps<FakeObj, typeof props>(props) {
+      createLeafletObject(opts: PropOptionValues<typeof props>): FakeObj {
+        return create(opts);
+      }
+    }
+    customElements.define('wp-positional', El);
+    const el = document.createElement('wp-positional');
+    el.setAttribute('radius', '50');
+    el.setAttribute('opacity', '0.5');
+    document.body.append(el);
+
+    expect(create).toHaveBeenCalledWith({ opacity: 0.5 });
+    el.remove();
+  });
+
+  it('calls leafletObjectCreated() after creation', () => {
+    const props = BASE_PROPS;
+    const created = vi.fn();
+    class El extends WithProps<FakeObj, typeof props>(props) {
+      createLeafletObject(): FakeObj {
+        return new FakeObj();
+      }
+      leafletObjectCreated(): void {
+        created();
+      }
+    }
+    customElements.define('wp-created-hook', El);
+    document.body.append(document.createElement('wp-created-hook'));
+    expect(created).toHaveBeenCalledOnce();
+  });
+});
+
+describe('WithProps: attribute changes update the Leaflet object', () => {
+  it('dispatches to the matching setNAME method by default', () => {
+    const tag = 'wp-attr-setter';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+    node.setAttribute('radius', '42');
+    expect(node.leafletObject?.radius).toBe(42);
+    node.remove();
+  });
+
+  it('falls back to the default value when the attribute is removed', () => {
+    const tag = 'wp-attr-remove-falls-back';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    node.setAttribute('radius', '99');
+    document.body.append(node);
+    expect(node.leafletObject?.radius).toBe(99);
+
+    node.removeAttribute('radius');
+    // BASE_PROPS default.
+    expect(node.leafletObject?.radius).toBe(5);
+    node.remove();
+  });
+
+  it('uses a custom `set` function instead of the setter when provided', () => {
+    const props = {
+      radius: num<FakeObj>(5, {
+        set(obj, value) {
+          obj.setRadius(value * 2);
+        },
+      }),
+    } as const;
+    class El extends WithProps<FakeObj, typeof props>(props) {
+      createLeafletObject(): FakeObj {
+        return new FakeObj();
+      }
+    }
+    const tag = 'wp-custom-set';
+    customElements.define(tag, El);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+    node.setAttribute('radius', '10');
+    expect(node.leafletObject?.radius).toBe(20);
+    node.remove();
+  });
+
+  it('is a silent no-op when there is neither a custom `set` nor a matching setter (constructor-only props)', () => {
+    const props = { unsettable: str<FakeObj>('x') } as const;
+    class El extends WithProps<FakeObj, typeof props>(props) {
+      createLeafletObject(): FakeObj {
+        return new FakeObj();
+      }
+    }
+    const tag = 'wp-constructor-only';
+    customElements.define(tag, El);
+    const node = document.createElement(tag);
+    document.body.append(node);
+    expect(() => node.setAttribute('unsettable', 'y')).not.toThrow();
+    node.remove();
+  });
+
+  it('ignores attribute churn before the element is connected', () => {
+    const tag = 'wp-not-connected';
+    const { create } = define(tag);
+    const node = document.createElement(tag);
+    node.setAttribute('radius', '1');
+    node.setAttribute('radius', '2');
+    expect(create).not.toHaveBeenCalled();
+  });
+});
+
+describe('WithProps: recreate option', () => {
+  it('rebuilds the whole object on any attribute change instead of calling a setter', () => {
+    const props = { radius: num<FakeObj>(5) } as const;
+    const created = vi.fn();
+    class El extends WithProps<FakeObj, typeof props>(props, { recreate: true }) {
+      createLeafletObject(opts: PropOptionValues<typeof props>): FakeObj {
+        const obj = new FakeObj();
+        if (opts.radius !== undefined) obj.setRadius(opts.radius);
+        return obj;
+      }
+      leafletObjectCreated(): void {
+        created();
+      }
+    }
+    const tag = 'wp-recreate';
+    customElements.define(tag, El);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+
+    const first = node.leafletObject;
+    expect(created).toHaveBeenCalledTimes(1);
+
+    node.setAttribute('radius', '7');
+    expect(node.leafletObject).not.toBe(first);
+    expect(node.leafletObject?.radius).toBe(7);
+    expect(created).toHaveBeenCalledTimes(2);
+    node.remove();
+  });
+});
+
+describe('WithProps: property accessors', () => {
+  it('get reads the live Leaflet value when `get` is defined', () => {
+    const tag = 'wp-get-live';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & {
+      leafletObject?: FakeObj;
+      radius: number;
+    };
+    document.body.append(node);
+    // Bypass the attribute entirely.
+    node.leafletObject!.setRadius(123);
+    expect(node.radius).toBe(123);
+    node.remove();
+  });
+
+  it('get falls back to the attribute, then the default, when unconnected', () => {
+    const tag = 'wp-get-fallback';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { radius: number };
+    // Default, not connected yet.
+    expect(node.radius).toBe(5);
+    node.setAttribute('radius', '9');
+    // Attribute, still not connected.
+    expect(node.radius).toBe(9);
+  });
+
+  it('set encodes the value onto the attribute', () => {
+    const tag = 'wp-set-encodes';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { radius: number };
+    node.radius = 33;
+    expect(node.getAttribute('radius')).toBe('33');
+  });
+});
+
+describe('WithProps: event-driven attribute sync-back', () => {
+  it('re-syncs the attribute after the named Leaflet event fires', () => {
+    const props = {
+      radius: num<FakeObj>(5, { get: (obj) => obj.getRadius(), event: 'radiuschange' }),
+    } as const;
+    class El extends WithProps<FakeObj, typeof props>(props) {
+      createLeafletObject(): FakeObj {
+        return new FakeObj();
+      }
+    }
+    const tag = 'wp-event-sync';
+    customElements.define(tag, El);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+
+    node.leafletObject!.setRadius(77);
+    // Not synced yet.
+    expect(node.getAttribute('radius')).toBeNull();
+    node.leafletObject!.fire('radiuschange');
+    expect(node.getAttribute('radius')).toBe('77');
+    node.remove();
+  });
+});
+
+describe('WithProps: generic leaflet: event forwarding', () => {
+  it('re-emits any fired Leaflet event as a non-bubbling leaflet:<type> CustomEvent', () => {
+    const tag = 'wp-forward-events';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    const wrapper = document.createElement('div');
+    wrapper.append(node);
+    document.body.append(wrapper);
+
+    const onNode = vi.fn();
+    const onWrapper = vi.fn();
+    node.addEventListener('leaflet:zoomend', onNode);
+    wrapper.addEventListener('leaflet:zoomend', onWrapper);
+
+    node.leafletObject!.fire('zoomend', { foo: 1 });
+
+    expect(onNode).toHaveBeenCalledOnce();
+    const event = onNode.mock.calls[0][0] as CustomEvent;
+    expect(event.detail).toEqual({ foo: 1 });
+    // Does not bubble.
+    expect(onWrapper).not.toHaveBeenCalled();
+    wrapper.remove();
+  });
+
+  it('dispatches the DOM event after native on() handlers have already run', () => {
+    const tag = 'wp-forward-order';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+
+    let nativeRanFirst = false;
+    node.leafletObject!.on('customevent', () => {
+      nativeRanFirst = true;
+    });
+    node.addEventListener('leaflet:customevent', () => {
+      expect(nativeRanFirst).toBe(true);
+    });
+    node.leafletObject!.fire('customevent');
+    node.remove();
+  });
+});
+
+describe('WithProps: attach modes', () => {
+  it('attach "children" (default) registers with the parent and listens for children', () => {
+    const tag = 'wp-attach-children';
+    define(tag);
+    const parent = document.createElement('div');
+    document.body.append(parent);
+    const onRegister = vi.fn();
+    parent.addEventListener('leaflet-register', onRegister);
+
+    const node = document.createElement(tag);
+    parent.append(node);
+    expect(onRegister).toHaveBeenCalledOnce();
+    parent.remove();
+  });
+
+  it('attach "self" registers with the parent but does not bind child registrations', () => {
+    const tag = 'wp-attach-self';
+    define(tag, BASE_PROPS, { attach: 'self' });
+    const parent = document.createElement('div');
+    document.body.append(parent);
+    const onRegister = vi.fn();
+    parent.addEventListener('leaflet-register', onRegister);
+
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    parent.append(node);
+    // It still registers itself.
+    expect(onRegister).toHaveBeenCalledOnce();
+
+    const bindPopup = vi.spyOn(node.leafletObject!, 'bindPopup');
+    const fakeChild = document.createElement('div');
+    node.append(fakeChild);
+    fakeChild.dispatchEvent(
+      new CustomEvent('leaflet-register', {
+        bubbles: true,
+        composed: true,
+        detail: { leafletObject: new Popup(), element: fakeChild },
+      }),
+    );
+    // "self" doesn't listen for children.
+    expect(bindPopup).not.toHaveBeenCalled();
+    parent.remove();
+  });
+
+  it('attach "none" does not register with the parent at all', () => {
+    const tag = 'wp-attach-none';
+    define(tag, BASE_PROPS, { attach: 'none' });
+    const parent = document.createElement('div');
+    document.body.append(parent);
+    const onRegister = vi.fn();
+    parent.addEventListener('leaflet-register', onRegister);
+
+    parent.append(document.createElement(tag));
+    expect(onRegister).not.toHaveBeenCalled();
+    parent.remove();
+  });
+});
+
+// These need real Leaflet Popup/Tooltip/Marker instances because
+// #onChildRegister discriminates children by `instanceof Popup/Tooltip/Layer`,
+// not duck typing.
+describe('WithProps: child registration binds popups, tooltips and layers', () => {
+  it('binds a registering Popup child via bindPopup', () => {
+    const tag = 'wp-bind-popup';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+    const bindPopup = vi.spyOn(node.leafletObject!, 'bindPopup');
+
+    const child = document.createElement('div');
+    node.append(child);
+    child.dispatchEvent(childRegisterEvent(child, new Popup()));
+
+    expect(bindPopup).toHaveBeenCalledOnce();
+    node.remove();
+  });
+
+  it('binds a registering Tooltip child via bindTooltip', () => {
+    const tag = 'wp-bind-tooltip';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+    const bindTooltip = vi.spyOn(node.leafletObject!, 'bindTooltip');
+
+    const child = document.createElement('div');
+    node.append(child);
+    child.dispatchEvent(childRegisterEvent(child, new Tooltip()));
+
+    expect(bindTooltip).toHaveBeenCalledOnce();
+    node.remove();
+  });
+
+  it('adds a registering Layer child via addLayer', () => {
+    const tag = 'wp-bind-layer';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+    const addLayer = vi.spyOn(node.leafletObject!, 'addLayer');
+
+    const child = document.createElement('div');
+    node.append(child);
+    child.dispatchEvent(childRegisterEvent(child, new Marker([0, 0])));
+
+    expect(addLayer).toHaveBeenCalledOnce();
+    node.remove();
+  });
+
+  it('releases children (unbind/remove) on disconnect', () => {
+    const tag = 'wp-release-children';
+    define(tag);
+    const node = document.createElement(tag) as HTMLElement & { leafletObject?: FakeObj };
+    document.body.append(node);
+    const leafletObject = node.leafletObject!;
+
+    const child = document.createElement('div');
+    node.append(child);
+    child.dispatchEvent(childRegisterEvent(child, new Popup()));
+
+    const unbindPopup = vi.spyOn(leafletObject, 'unbindPopup');
+    node.remove();
+    expect(unbindPopup).toHaveBeenCalledOnce();
+  });
+});
diff --git a/test/integration.test.ts b/test/integration.test.ts
new file mode 100644
index 0000000..1f274d9
--- /dev/null
+++ b/test/integration.test.ts
@@ -0,0 +1,84 @@
+import { FeatureGroup, Map as LMap, Marker, Popup, TileLayer } from 'leaflet';
+import { describe, expect, it } from 'vitest';
+import '../src/components/leaflet-map.ts';
+import '../src/components/leaflet-tile-layer.ts';
+import '../src/components/leaflet-feature-group.ts';
+import '../src/components/leaflet-marker.ts';
+import '../src/components/leaflet-popup.ts';
+
+// Exercises the registration-bubbling protocol end to end across a small real
+// tree, rather than one component at a time: <leaflet-register> events bubble
+// from marker -> feature-group -> map, and popup binds to its parent marker
+// instead of bubbling past it.
+describe('component tree wiring', () => {
+  it('wires a map + tile-layer + feature-group + marker + popup tree together', () => {
+    const map = document.createElement('leaflet-map') as HTMLElement & {
+      leafletObject?: LMap;
+    };
+    map.setAttribute('lat', '51.5');
+    map.setAttribute('lng', '-0.09');
+    map.setAttribute('zoom', '13');
+
+    const tiles = document.createElement('leaflet-tile-layer') as HTMLElement & {
+      leafletObject?: TileLayer;
+    };
+    tiles.setAttribute('url', 'https://tile.example/{z}/{x}/{y}.png');
+
+    const group = document.createElement('leaflet-feature-group') as HTMLElement & {
+      leafletObject?: FeatureGroup;
+    };
+
+    const marker = document.createElement('leaflet-marker') as HTMLElement & {
+      leafletObject?: Marker;
+    };
+    marker.setAttribute('lat', '51.51');
+    marker.setAttribute('lng', '-0.1');
+
+    const popup = document.createElement('leaflet-popup') as HTMLElement & {
+      leafletObject?: Popup;
+    };
+    popup.innerHTML = 'hello';
+
+    marker.append(popup);
+    group.append(marker);
+    map.append(tiles, group);
+    document.body.append(map);
+
+    // tile-layer and feature-group both registered directly onto the map.
+    expect(map.leafletObject?.hasLayer(tiles.leafletObject!)).toBe(true);
+    expect(map.leafletObject?.hasLayer(group.leafletObject!)).toBe(true);
+
+    // marker registered onto the feature-group (which, per Leaflet's own
+    // LayerGroup.onAdd, also adds each child directly onto the map so it
+    // renders -- hasLayer is true on both, membership is what distinguishes them).
+    expect(group.leafletObject?.hasLayer(marker.leafletObject!)).toBe(true);
+    expect(map.leafletObject?.hasLayer(marker.leafletObject!)).toBe(true);
+    expect(group.leafletObject?.getLayers()).toEqual([marker.leafletObject]);
+
+    // popup bound to the marker, not registered as a map layer at all.
+    expect(marker.leafletObject?.getPopup()).toBe(popup.leafletObject);
+
+    // A marker added later goes through the same path.
+    const marker2 = document.createElement('leaflet-marker') as HTMLElement & {
+      leafletObject?: Marker;
+    };
+    marker2.setAttribute('lat', '1');
+    marker2.setAttribute('lng', '2');
+    group.append(marker2);
+    expect(group.leafletObject?.hasLayer(marker2.leafletObject!)).toBe(true);
+
+    // Disconnecting a child removes it from the map (WithProps calls the
+    // Leaflet object's own .remove(), which detaches from its _map).
+    // leafletObject is gone once disconnected, so capture the reference first.
+    // Note this is a pre-existing Leaflet quirk, not something WithProps
+    // introduces: Layer#remove() only detaches from the map, it does not tell
+    // an owning LayerGroup/FeatureGroup to forget it (that needs the group's
+    // own removeLayer()) -- so the group's hasLayer() stays stale/true here.
+    const removedMarkerObj = marker.leafletObject!;
+    marker.remove();
+    expect(map.leafletObject?.hasLayer(removedMarkerObj)).toBe(false);
+    expect(group.leafletObject?.hasLayer(removedMarkerObj)).toBe(true);
+
+    map.remove();
+  });
+});
diff --git a/test/setup.ts b/test/setup.ts
new file mode 100644
index 0000000..dbe97ff
--- /dev/null
+++ b/test/setup.ts
@@ -0,0 +1,10 @@
+// jsdom has no ResizeObserver. leaflet-map only uses it to call
+// invalidateSize() on resize, which no test here depends on incidentally --
+// without a stub, just importing the component throws.
+class ResizeObserverStub implements ResizeObserver {
+  observe(): void {}
+  unobserve(): void {}
+  disconnect(): void {}
+}
+
+globalThis.ResizeObserver ??= ResizeObserverStub;
diff --git a/tsconfig.test.json b/tsconfig.test.json
new file mode 100644
index 0000000..43c6788
--- /dev/null
+++ b/tsconfig.test.json
@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "rootDir": ".",
+    "noEmit": true,
+    "declaration": false,
+    "declarationMap": false
+  },
+  "include": ["src/**/*", "test/**/*"]
+}
diff --git a/vitest.config.ts b/vitest.config.ts
new file mode 100644
index 0000000..af023e4
--- /dev/null
+++ b/vitest.config.ts
@@ -0,0 +1,9 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    environment: 'jsdom',
+    include: ['test/**/*.test.ts'],
+    setupFiles: ['./test/setup.ts'],
+  },
+});