writer := newBitrotWriter(disk, "", volume, filePath, 35, bitrotAlgo, 10)

	_, err = writer.Write([]byte("aaaaaaaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaaaaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaaaaaaa"))
	if err != nil {
		t.Fatal(err)
	}
	_, err = writer.Write([]byte("aaaaa"))
	if err != nil {
		t.Fatal(err)
	}

	warningRecorder.AddWarning("", "aaaaaaaaaa")  // long item
	warningRecorder.AddWarning("-", "aaaaaaaaaa") // duplicate item
	warningRecorder.AddWarning("", "bb")          // short item
	warningRecorder.AddWarning("", "ccc")         // short item
	warningRecorder.AddWarning("", "Iñtërnâtiô")  // long item
	// check they are preserved

}

// Test for AppendFile.
func TestAppendFile(t *testing.T) {
	f, err := os.CreateTemp("", "")
	if err != nil {
		t.Fatal(err)
	}
	name1 := f.Name()
	defer os.Remove(name1)
	f.WriteString("aaaaaaaaaa")
	f.Close()

	f, err = os.CreateTemp("", "")
	if err != nil {
		t.Fatal(err)
	}
	name2 := f.Name()
	defer os.Remove(name2)
	f.WriteString("bbbbbbbbbb")
	f.Close()

L	aaaa\nbbbb\ncccc\nddddd\neeeeee\nfffffff\ngggg\nhhhh\niiiii\njjjjj\nkkkkk\nllll		XaaaXbbbXcccXdddXeeeXfffXgggXhhhXiiiXjjjXkkkXlllXcbaXaaaa	NOMATCH
E	a*a*a*a*a*b		aaaaaaaaab	(0,10)
BE	^			NULL		(0,0)
BE	$			NULL		(0,0)
BE	^$			NULL		(0,0)
BE	^a$			a		(0,1)
BE	abc			abc		(0,3)
BE	abc			xabcy		(1,4)
BE	abc			ababc		(2,5)
BE	ab*c			abc		(0,3)
BE	ab*bc			abc		(0,3)