added a simple test for the host_redirect middleware using mocha and should.js

src/test/host_redirect.test.coffee

@@ -0,0 +1,28 @@
+require 'should'
+
+host_rewrite = require '../middleware/host_redirect'
+
+describe 'host_redirect', ->
+
+  redirect_map =
+    'www.foo.com': 'http://foo.com/',
+    'img.foo.com': 'http://images.foo.com/'
+
+  redirector = host_rewrite(redirect_map)
+
+  describe 'when request does not match any entry in map', ->
+    it 'next() is called to pass on the request', (done) ->
+      req = { header: -> 'www.bar.com' }
+      res = {}
+      next = -> done()
+      redirector(req, res, next)
+
+  describe 'when request matches an entry in map', ->
+    it 'req.redirect() is called with the new URL', (done) ->
+      req = { header: -> 'img.foo.com' }
+      res =
+        redirect: (url) ->
+          url.should.equal(redirect_map[req.header()])
+          done()
+      next = ->
+      redirector(req, res, next)