verify(this.mechContext, never()).calculateMIC(any());
    }

    @Test
    @DisplayName("verifyMIC throws when context not established")
    void testVerifyMICRequiresEstablished() throws Exception {
        SpnegoContext ctx = newContext();
        CIFSException ex = assertThrows(CIFSException.class, () -> ctx.verifyMIC(new byte[] { 1 }, new byte[] { 2 }));