ctx, cancel := context.WithCancel(context.Background())
	go func() {
		select {
		case <-ctx1.Done():
		case <-ctx2.Done():
		// The lock acquirer decides to cancel, exit this goroutine
		case <-ctx.Done():
		}

		cancel()
	}()
	return ctx, cancel
}

func (ld sharedLock) GetLock(ctx context.Context) (context.Context, context.CancelFunc) {

        }
        verifyNoInteractions(mockDir);
    }

    /**
     * Edge: passing a null directory object. Interface allows null; implementation decides.
     */
    @Test
    @DisplayName("null directory is handled by implementation")
    void handlesNullDirectory() throws Exception {
        SmbFilenameFilter filter = (dir, name) -> dir == null;