Introduce new async-def coroutine syntax (#1657)

tests/unit_tests/test_core.py

@@ -490,11 +490,15 @@ class TestEsphomeCore:
 
     def test_reset(self, target):
         """Call reset on target and compare to new instance"""
-        other = core.EsphomeCore()
+        other = core.EsphomeCore().__dict__
 
         target.reset()
+        t = target.__dict__
+        # ignore event loop
+        del other["event_loop"]
+        del t["event_loop"]
 
-        assert target.__dict__ == other.__dict__
+        assert t == other
 
     def test_address__none(self, target):
         target.config = {}