Add tests for source_ip and source_port

tornado/test/tcpclient_test.py

@@ -81,9 +81,11 @@ def skipIfLocalhostV4(self):
             self.skipTest("localhost does not resolve to ipv6")
 
     @gen_test
-    def do_test_connect(self, family, host):
+    def do_test_connect(self, family, host, source_ip=None, source_port=None):
         port = self.start_server(family)
-        stream = yield self.client.connect(host, port)
+        stream = yield self.client.connect(host, port,
+                                           source_ip=source_ip,
+                                           source_port=source_port)
         with closing(stream):
             stream.write(b"hello")
             data = yield self.server.streams[0].read_bytes(5)
@@ -125,6 +127,32 @@ def test_refused_ipv4(self):
         with self.assertRaises(IOError):
             yield self.client.connect('127.0.0.1', port)
 
+    def test_source_ip_fail(self):
+        '''
+        Fail when trying to use the source IP Address '8.8.8.8'.
+        '''
+        self.assertRaises(socket.error,
+                          self.do_test_connect,
+                          socket.AF_INET,
+                          '127.0.0.1',
+                          source_ip='8.8.8.8')
+
+    def test_source_ip_success(self):
+        '''
+        Success when trying to use the source IP Address '127.0.0.1'
+        '''
+        self.do_test_connect(socket.AF_INET, '127.0.0.1', source_ip='127.0.0.1')
+
+    def test_source_port_fail(self):
+        '''
+        Fail when trying to use source port 1.
+        '''
+        self.assertRaises(socket.error,
+                          self.do_test_connect,
+                          socket.AF_INET,
+                          '127.0.0.1',
+                          source_port=1)
+
 
 class TestConnectorSplit(unittest.TestCase):
     def test_one_family(self):