ctx.dispose();
        verify(this.mechContext, times(1)).dispose();
    }

    @Test
    @DisplayName("calculateMIC throws when context not established")
    void testCalculateMICRequiresEstablished() throws Exception {
        SpnegoContext ctx = newContext();
        CIFSException ex = assertThrows(CIFSException.class, () -> ctx.calculateMIC(new byte[] { 1 }));