Function test_init_app_server_false_pattern

tests/unit/test_configs.py:551–566

Test that init_app works correctly when server=False is used. This tests the fix for https://github.com/plotly/dash/issues/3787 where using server=False and then calling init_app would result in 404 errors because the backend's server reference was not updated.

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def test_init_app_server_false_pattern():
    """Test that init_app works correctly when server=False is used.

    This tests the fix for https://github.com/plotly/dash/issues/3787
    where using server=False and then calling init_app would result in
    404 errors because the backend's server reference was not updated.
    """
    external_server = Flask("external_test_false")
    app = Dash(__name__, server=False)

    # Call init_app with the external server
    app.init_app(external_server)

    # Verify both the app and backend use the external server
    assert app.server is external_server
    assert app.backend.server is external_server