Add tests for server start/stop event functions

tests/tests_server_events.py

@@ -0,0 +1,59 @@
+from io import StringIO
+from random import choice
+from string import ascii_letters
+import signal
+
+import pytest
+
+from sanic import Sanic
+
+AVAILABLE_LISTENERS = [
+    'before_start',
+    'after_start',
+    'before_stop',
+    'after_stop'
+]
+
+
+def create_listener(listener_name, in_list):
+    async def _listener(app, loop):
+        print('DEBUG MESSAGE FOR PYTEST for {}'.format(listener_name))
+        in_list.insert(0, app.name + listener_name)
+    return _listener
+
+
+def start_stop_app(random_name_app, **run_kwargs):
+
+    def stop_on_alarm(signum, frame):
+        raise KeyboardInterrupt('SIGINT for sanic to stop gracefully')
+
+    signal.signal(signal.SIGALRM, stop_on_alarm)
+    signal.alarm(1)
+    try:
+        random_name_app.run(**run_kwargs)
+    except KeyboardInterrupt:
+        pass
+
+
+@pytest.mark.parametrize('listener_name', AVAILABLE_LISTENERS)
+def test_single_listener(listener_name):
+    """Test that listeners on their own work"""
+    random_name_app = Sanic(''.join(
+        [choice(ascii_letters) for _ in range(choice(range(5, 10)))]))
+    output = list()
+    start_stop_app(
+        random_name_app,
+        **{listener_name: create_listener(listener_name, output)})
+    assert random_name_app.name + listener_name == output.pop()
+
+
+def test_all_listeners():
+    random_name_app = Sanic(''.join(
+        [choice(ascii_letters) for _ in range(choice(range(5, 10)))]))
+    output = list()
+    start_stop_app(
+        random_name_app,
+        **{listener_name: create_listener(listener_name, output)
+           for listener_name in AVAILABLE_LISTENERS})
+    for listener_name in AVAILABLE_LISTENERS:
+        assert random_name_app.name + listener_name == output.pop()