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();
    }