Created dlep unicode unit test

Also fixed test HTTP producer on error.

Tribler/Test/Core/Modules/RestApi/base_api_test.py

@@ -31,6 +31,9 @@ def startProducing(self, consumer):
         consumer.write(self.body)
         return succeed(None)
 
+    def stopProducing(self):
+        return succeed(None)
+
 
 class AbstractBaseApiTest(TestAsServer):
     """
@@ -69,7 +72,9 @@ def setUpPreSession(self):
     def do_request(self, endpoint, request_type, post_data, raw_data):
         agent = Agent(reactor, pool=self.connection_pool)
         return agent.request(request_type, 'http://localhost:%s/%s' % (self.session.get_http_api_port(), endpoint),
-                             Headers({'User-Agent': ['Tribler ' + version_id]}), POSTDataProducer(post_data, raw_data))
+                             Headers({'User-Agent': ['Tribler ' + version_id],
+                                      "Content-Type": ["text/plain; charset=utf-8"]}),
+                             POSTDataProducer(post_data, raw_data))
 
 
 class AbstractApiTest(AbstractBaseApiTest):

Tribler/Test/Core/Modules/RestApi/test_downloads_endpoint.py

@@ -82,6 +82,28 @@ def verify_download(_):
         return self.do_request('downloads', expected_code=200, request_type='PUT', post_data=post_data,
                                expected_json=expected_json).addCallback(verify_download)
 
+    @deferred(timeout=10)
+    def test_start_download_from_file_unicode(self):
+        """
+        Testing whether we can start a download from a file with a unicode name
+        """
+        def verify_download(response):
+            self.assertTrue(json.loads(response)['started'])
+            self.assertGreaterEqual(len(self.session.get_downloads()), 1)
+            dl = self.session.get_downloads()[0]
+            dl.tracker_status[u"\u266b"] = [0, 'Not contacted yet']
+            tdef = dl.get_def()
+            tdef.input['name'] = u'video\u266b'
+            return self.do_request('downloads?get_peers=1&get_pieces=1', expected_code=200)
+
+        ufile = os.path.join(TESTS_DATA_DIR, u'video\u266b.avi.torrent')
+        udest = os.path.join(self.session_base_dir, u'video\u266b')
+
+        post_data = (u'uri=file:%s&destination=%s' % (ufile, udest)).encode('utf-8')
+        self.should_check_equality = False
+        return self.do_request('downloads', expected_code=200, request_type='PUT', post_data=post_data,
+                               raw_data=True).addCallback(verify_download)
+
     @deferred(timeout=10)
     def test_start_download_from_magnet(self):
         """