mirror of
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f0c542dcd7
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
(cherry picked from commit 97a66f7a64)
100 lines
3.2 KiB
Python
100 lines
3.2 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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"""Tests for MCP flask_singleton lazy initialization."""
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from unittest.mock import MagicMock, patch
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import pytest
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@patch("superset.mcp_service.flask_singleton._create_flask_app")
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def test_get_flask_app_calls_create_on_first_use(mock_create):
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"""First call to get_flask_app() triggers _create_flask_app()."""
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import superset.mcp_service.flask_singleton as mod
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mock_app = MagicMock()
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mock_create.return_value = mock_app
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# Reset singleton state
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mod._app = None
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result = mod.get_flask_app()
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mock_create.assert_called_once()
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assert result is mock_app
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# Cleanup
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mod._app = None
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@patch("superset.mcp_service.flask_singleton._create_flask_app")
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def test_get_flask_app_returns_cached_on_second_call(mock_create):
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"""Second call returns cached app without calling _create_flask_app() again."""
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import superset.mcp_service.flask_singleton as mod
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mock_app = MagicMock()
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mock_create.return_value = mock_app
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# Reset singleton state
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mod._app = None
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first = mod.get_flask_app()
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second = mod.get_flask_app()
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mock_create.assert_called_once()
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assert first is second
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# Cleanup
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mod._app = None
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def test_import_does_not_trigger_app_creation():
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"""Importing flask_singleton should NOT trigger Flask app creation."""
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import superset.mcp_service.flask_singleton as mod
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# Module-level _app should be None until get_flask_app() is called
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# (unless a previous test set it — so we check it's not auto-created on import)
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# The key property: importing the module has no side effects
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assert hasattr(mod, "_app")
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assert hasattr(mod, "get_flask_app")
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assert callable(mod.get_flask_app)
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def test_app_variable_not_exported():
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"""The module-level 'app' variable should not exist (forces ImportError)."""
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import superset.mcp_service.flask_singleton as mod
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assert not hasattr(mod, "app"), (
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"Module should not export 'app' — callers must use get_flask_app()"
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)
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@patch("superset.mcp_service.flask_singleton._create_flask_app")
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def test_get_flask_app_logs_error_on_failure(mock_create):
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"""get_flask_app() logs the error and re-raises on failure."""
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import superset.mcp_service.flask_singleton as mod
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mod._app = None
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mock_create.side_effect = RuntimeError("test error")
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with pytest.raises(RuntimeError, match="test error"):
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mod.get_flask_app()
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# Cleanup
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mod._app = None
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