Add tests (#1430)

tests/test_app.py

@@ -0,0 +1,82 @@
+import asyncio
+
+import pytest
+
+from sanic.exceptions import SanicException
+from sanic.response import text
+
+
+def test_app_loop_running(app):
+
+    @app.get('/test')
+    async def handler(request):
+        assert isinstance(app.loop, asyncio.AbstractEventLoop)
+        return text('pass')
+
+    request, response = app.test_client.get('/test')
+    assert response.text == 'pass'
+
+
+def test_app_loop_not_running(app):
+    with pytest.raises(SanicException) as excinfo:
+        app.loop
+
+    assert str(excinfo.value) == (
+        'Loop can only be retrieved after the app has started '
+        'running. Not supported with `create_server` function'
+    )
+
+
+def test_app_run_raise_type_error(app):
+
+    with pytest.raises(TypeError) as excinfo:
+        app.run(loop='loop')
+
+    assert str(excinfo.value) == (
+        'loop is not a valid argument. To use an existing loop, '
+        'change to create_server().\nSee more: '
+        'https://sanic.readthedocs.io/en/latest/sanic/deploying.html'
+        '#asynchronous-support'
+    )
+
+
+def test_app_route_raise_value_error(app):
+
+    with pytest.raises(ValueError) as excinfo:
+        @app.route('/test')
+        async def handler():
+            return text('test')
+
+    assert str(excinfo.value) == 'Required parameter `request` missing in the handler() route?'
+
+
+def test_app_handle_request_handler_is_none(app, monkeypatch):
+
+    def mockreturn(*args, **kwargs):
+        return None, [], {}, ''
+
+    # Not sure how to make app.router.get() return None, so use mock here.
+    monkeypatch.setattr(app.router, 'get', mockreturn)
+
+    @app.get('/test')
+    def handler(request):
+        return text('test')
+
+    request, response = app.test_client.get('/test')
+
+    assert response.text == 'Error: \'None\' was returned while requesting a handler from the router'
+
+
+@pytest.mark.parametrize('websocket_enabled', [True, False])
+@pytest.mark.parametrize('enable', [True, False])
+def test_enable_websocket(app, websocket_enabled, enable):
+    app.websocket_enabled = websocket_enabled
+    app.enable_websocket(enable=enable)
+
+    assert app.websocket_enabled == enable
+
+    @app.websocket('/ws')
+    async def handler(request, ws):
+        await ws.send('test')
+
+    assert app.websocket_enabled == True