re-add missing url method to live_server (#141)

Author: Roguelazer

pytest_flask/live_server.py

@@ -69,6 +69,12 @@ def _is_ready(self):
             sock.close()
         return ret
 
+    def url(self, url=""):
+        """Returns the complete url based on server options."""
+        return "http://{host!s}:{port!s}{url!s}".format(
+            host=self.host, port=self.port, url=url
+        )
+
     def stop(self):
         """Stop application process."""
         if self._process:

tests/test_live_server.py

@@ -12,6 +12,7 @@ class TestLiveServer:
     def test_init(self, live_server):
         assert live_server.port
         assert live_server.host == "localhost"
+        assert live_server.url() == "http://localhost:{0}".format(live_server.port)
 
     def test_server_is_alive(self, live_server):
         assert live_server._process