verify(this.mechContext, times(1)).getSigningKey();
    }

    @Test
    @DisplayName("supportsIntegrity delegates to underlying mechanism context")
    void testSupportsIntegrityDelegates() {
        SpnegoContext ctx = newContext();
        when(this.mechContext.supportsIntegrity()).thenReturn(true);
        assertTrue(ctx.supportsIntegrity());
        verify(this.mechContext, times(1)).supportsIntegrity();
    }

        if ((mechanismListMIC == null || !this.mechContext.supportsIntegrity()) && this.requireMic
                && !this.mechContext.isPreferredMech(this.selectedMech)) {
            throw new CIFSException("SPNEGO integrity is required but not available");
        }

        // otherwise we ignore the absence of a MIC
        if (!this.mechContext.isMICAvailable() || mechanismListMIC == null) {
            return;