Rewrite core event tests to pytest tests (#40664)

tests/test_core.py

@@ -268,23 +268,20 @@ async def test_add_job_with_none(hass):
         hass.async_add_job(None, "test_arg")
 
 
-class TestEvent(unittest.TestCase):
-    """A Test Event class."""
-
-    def test_eq(self):
+def test_event_eq():
     """Test events."""
     now = dt_util.utcnow()
     data = {"some": "attr"}
     context = ha.Context()
     event1, event2 = [
-            ha.Event("some_type", data, time_fired=now, context=context)
-            for _ in range(2)
+        ha.Event("some_type", data, time_fired=now, context=context) for _ in range(2)
     ]
 
     assert event1 == event2
 
-    def test_repr(self):
-        """Test that repr method works."""
+
+def test_event_repr():
+    """Test that Event repr method works."""
     assert str(ha.Event("TestEvent")) == "<Event TestEvent[L]>"
 
     assert (
@@ -292,8 +289,9 @@ class TestEvent(unittest.TestCase):
         == "<Event TestEvent[R]: beer=nice>"
     )
 
-    def test_as_dict(self):
-        """Test as dictionary."""
+
+def test_event_as_dict():
+    """Test as Event as dictionary."""
     event_type = "some_type"
     now = dt_util.utcnow()
     data = {"some": "attr"}
@@ -310,7 +308,7 @@ class TestEvent(unittest.TestCase):
             "user_id": event.context.user_id,
         },
     }
-        assert expected == event.as_dict()
+    assert event.as_dict() == expected
 
 
 class TestEventBus(unittest.TestCase):