Devtools: fix MIME type inferrence.

mojo/devtools/common/devtoolslib/http_server_unittest.py

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import StringIO
 import gzip
 import imp
 import os.path
 import shutil
 import sys
@@ skipping 15 matching lines @@
   def setUp(self):
     """Creates a tree of temporary directories and files of the form described
     below.
 
       parent_dir
         hello_dir
           hello_subdir
             hello_file
         other_dir
           other_file
+        apps
+          app.dart
     """
     self.parent_dir = tempfile.mkdtemp()
     self.parent_file = tempfile.NamedTemporaryFile(delete=False,
                                                    dir=self.parent_dir)
     self.hello_dir = tempfile.mkdtemp(dir=self.parent_dir)
     self.hello_subdir = tempfile.mkdtemp(dir=self.hello_dir)
     self.hello_file = tempfile.NamedTemporaryFile(delete=False,
                                                   dir=self.hello_subdir)
     self.hello_file.write('hello')
     self.hello_file.close()
 
     self.other_dir = tempfile.mkdtemp(dir=self.parent_dir)
     self.other_file = tempfile.NamedTemporaryFile(delete=False,
                                                   dir=self.other_dir)
+    self.other_file.close()
+
+    self.apps_dir = tempfile.mkdtemp(dir=self.parent_dir)
+    self.dart_app_path = os.path.join(self.apps_dir, 'app.dart')
+    open(self.dart_app_path, 'w').close()
 
   def tearDown(self):
     shutil.rmtree(self.parent_dir)
 
   def test_mappings(self):
     """Maps two directories and verifies that the server serves files placed
     there.
     """
     mappings = [
         ('hello/', [self.hello_dir]),
@@ skipping 68 matching lines @@
     hello_response = urllib2.urlopen(server_address + 'hello/' +
                                      hello_relpath)
     self.assertEquals(200, hello_response.getcode())
     self.assertTrue('Content-Encoding' in hello_response.info())
     self.assertEquals('gzip', hello_response.info().get('Content-Encoding'))
 
     content = gzip.GzipFile(
         fileobj=StringIO.StringIO(hello_response.read())).read()
     self.assertEquals('hello', content)
 
+  def test_dart_mime_type(self):
+    """Verifies that files of '.dart' extension are served with MIME type
+    'application/dart'.
+    """
+    mappings = [
+        ('', [self.apps_dir]),
+    ]
+    server_address = ('http://%s:%u/' %
+                      http_server.start_http_server(mappings))
+
+    app_relpath = os.path.relpath(self.dart_app_path, self.apps_dir)
+    hello_response = urllib2.urlopen(server_address + app_relpath)
+    self.assertEquals(200, hello_response.getcode())
+    self.assertTrue('Content-Type' in hello_response.info())
+    self.assertEquals('application/dart',
+                      hello_response.info().get('Content-Type'))
+
 
 if __name__ == "__main__":
   unittest.main()