diff --git a/test/router.js b/test/router.js
index 6238e3a..e5f54fe 100644
--- a/test/router.js
+++ b/test/router.js
@@ -58,6 +58,15 @@ describe('Router', function () {
     })
   })
 
+  it('→ regex routes can return NotFoundError', function (done) {
+    var router = new Router()
+    router.add(['/by/id', /\d+/], function () {})
+    router.route('/by/id/not-an-id', function (err) {
+      expect(err).toBeA(NotFoundError)
+      done()
+    })
+  })
+
   it('→ get based on regex with multiple captures global', function (done) {
     var router = new Router()
     router.add(['by', 'order', /(\d+)/g], function (one, two, three) {
@@ -98,16 +107,15 @@ describe('Router', function () {
     router.route('/by/order/123', {args: [api]})
   })
 
-  it('→ get based on function', function (done) {
-    function toInt(part) {
-      var results = /^(\d+)$/.exec(part)
-      if (results) {
-        return parseInt(results[0], 10)
-      } else {
-        return null
-      }
+  function toInt(part) {
+    var results = /^(\d+)$/.exec(part)
+    if (results) {
+      return parseInt(results[0], 10)
+    } else {
+      return null
     }
-
+  }
+  it('→ get based on function', function (done) {
     var router = new Router()
     router.add(['by', 'order', toInt], function (val) {
       expect(val).toBe(123)
@@ -119,6 +127,15 @@ describe('Router', function () {
     })
   })
 
+  it('→ function routes can return NotFoundError', function (done) {
+    var router = new Router()
+    router.add(['/by/order', toInt], function () {})
+    router.route('/by/order/not-found', function (err) {
+      expect(err).toBeA(NotFoundError)
+      done()
+    })
+  })
+
   it('→ check not found error', function (done) {
     var router = new Router()
     router.route('/not/real/id', function (err) {