New TimeZone handling (#1138)

* Remove function to get TZ from config file

* Readd old timezone handling

* Fix tests

tests/common.py

@@ -7,3 +7,20 @@ def load_json_fixture(filename):
     """Load a fixture."""
     path = Path(Path(__file__).parent.joinpath("fixtures"), filename)
     return json.loads(path.read_text())
+
+
+def mock_coro(return_value=None, exception=None):
+    """Return a coro that returns a value or raise an exception."""
+    return mock_coro_func(return_value, exception)()
+
+
+def mock_coro_func(return_value=None, exception=None):
+    """Return a method to create a coro function that returns a value."""
+
+    async def coro(*args, **kwargs):
+        """Fake coroutine."""
+        if exception:
+            raise exception
+        return return_value
+
+    return coro

tests/conftest.py

@@ -5,6 +5,8 @@ import pytest
 
 from hassio.bootstrap import initialize_coresys
 
+from tests.common import mock_coro
+
 # pylint: disable=redefined-outer-name
 
 
@@ -18,7 +20,10 @@ def docker():
 @pytest.fixture
 async def coresys(loop, docker):
     """Create a CoreSys Mock."""
-    with patch("hassio.bootstrap.initialize_system_data"):
+    with patch("hassio.bootstrap.initialize_system_data"), patch(
+        "hassio.bootstrap.fetch_timezone",
+        return_value=mock_coro(return_value="Europe/Zurich"),
+    ):
         coresys_obj = await initialize_coresys()
 
     coresys_obj.ingress.save_data = MagicMock()