Refresh the august access token when needed (#31735)

* Refresh the august access token
when needed.

Currently august will stop working when the token
expires about every six month.

This resolves issue #23788

* Make refresh_access_token_if_needed private since we do not want additional callers

* Add init

tests/components/august/test_init.py

@@ -0,0 +1,44 @@
+"""The tests for the august platform."""
+from unittest.mock import MagicMock, PropertyMock
+
+from homeassistant.components import august
+
+
+def _mock_august_authenticator():
+    authenticator = MagicMock(name="august.authenticator")
+    authenticator.should_refresh = MagicMock(
+        name="august.authenticator.should_refresh", return_value=0
+    )
+    authenticator.refresh_access_token = MagicMock(
+        name="august.authenticator.refresh_access_token"
+    )
+    return authenticator
+
+
+def _mock_august_authentication(token_text, token_timestamp):
+    authentication = MagicMock(name="august.authentication")
+    type(authentication).access_token = PropertyMock(return_value=token_text)
+    type(authentication).access_token_expires = PropertyMock(
+        return_value=token_timestamp
+    )
+    return authentication
+
+
+def test__refresh_access_token():
+    """Set up things to be run when tests are started."""
+    authentication = _mock_august_authentication("original_token", 1234)
+    authenticator = _mock_august_authenticator()
+    data = august.AugustData(
+        MagicMock(name="hass"), MagicMock(name="api"), authentication, authenticator
+    )
+    data._refresh_access_token_if_needed()
+    authenticator.refresh_access_token.assert_not_called()
+
+    authenticator.should_refresh.return_value = 1
+    authenticator.refresh_access_token.return_value = _mock_august_authentication(
+        "new_token", 5678
+    )
+    data._refresh_access_token_if_needed()
+    authenticator.refresh_access_token.assert_called()
+    assert data._access_token == "new_token"
+    assert data._access_token_expires == 5678