Adding server mode

tests/test_core/test_server.py

@@ -0,0 +1,19 @@
+from mock import patch
+import sure  # flake8: noqa
+
+from moto.server import main
+
+
+def test_wrong_arguments():
+    try:
+        main(["name", "test1", "test2"])
+        assert False, ("main() when called with the incorrect number of args"
+                       " should raise a system exit")
+    except SystemExit:
+        pass
+
+
+@patch('moto.server.app.run')
+def test_right_arguments(app_run):
+    main(["name", "s3"])
+    app_run.assert_called_once_with()