verify(handle, times(1)).hasCapability(captor.capture());
        assertEquals(cap, captor.getValue());
    }

    @Test
    @DisplayName("hasCapability(cap): propagates CIFSException on failure")
    void hasCapability_throws() throws Exception {
        // Arrange
        when(handle.hasCapability(anyInt())).thenThrow(new CIFSException("capability check failed"));

        // Act + Assert