// Each call is invalid without a held tree and should throw NPE
        assertThrows(NullPointerException.class, call);
    }

    static java.util.stream.Stream<Arguments> wrapExceptions() {
        CIFSContext ctx = mock(CIFSContext.class);
        SmbResourceLocatorImpl loc = new SmbResourceLocatorImpl(ctx, smbUrl("smb://server/share"));