Add a basic test

tests/test_basic.py

@@ -0,0 +1,12 @@
+import pytest
+import tornado.web
+from app import make_app
+
+@pytest.fixture
+def app():
+    return make_app()
+
+@pytest.mark.gen_test
+def test_hello_world(http_client, base_url):
+    response = yield http_client.fetch(base_url)
+    assert response.code == 200