Force lower case of email when registering

hass_nabucasa/auth.py

@@ -119,7 +119,7 @@ async def async_register(
                 await self.cloud.run_executor(
                     partial(
                         cognito.register,
-                        email,
+                        email.lower(),
                         password,
                         client_metadata=client_metadata,
                     ),

tests/test_auth.py

@@ -89,6 +89,17 @@ async def test_register(mock_cognito, cloud_mock):
     assert call.kwargs["client_metadata"] == {"test": "metadata"}
 
 
+async def test_register_lowercase_email(mock_cognito, cloud_mock):
+    """Test forcing lowercase email when registering an account."""
+    auth = auth_api.CognitoAuth(cloud_mock)
+    await auth.async_register("[email protected]", "password")
+    assert len(mock_cognito.register.mock_calls) == 1
+
+    call = mock_cognito.register.mock_calls[0]
+    result_user = call.args[0]
+    assert result_user == "[email protected]"
+
+
 async def test_register_fails(mock_cognito, cloud_mock):
     """Test registering an account."""
     mock_cognito.register.side_effect = aws_error("SomeError")