// Act & Assert
        assertEquals(-1L, trace.getTreeId());
    }

    @Test
    @DisplayName("getConfig(): delegates to context")
    void getConfig_delegatesToContext() {
        // Arrange
        CIFSContext ctx = mock(CIFSContext.class);
        Configuration cfg = mock(Configuration.class);
        when(ctx.getConfig()).thenReturn(cfg);