})

	_, err = f.WriteString(part2)
	if err != nil {
		t.Errorf("WriteString: %v", err)
	} else {
		t.Logf("WriteString(%q) = <nil>", part2)
	}
	f.Close()

	wait(t)
}

func TestCanLockExistingFile(t *testing.T) {
	t.Parallel()

	dir, remove := mustTempDir(t)
	defer remove()
	path := filepath.Join(dir, "existing.txt")

	if err := os.WriteFile(path, []byte("ok"), 0777); err != nil {