if err != nil {
		t.Fatalf("unable to create temp file")
	}
	defer os.Remove(file.Name())

	line := strings.Repeat("a", blockSize)
	testBytes := []byte(line + "\n" +
		line + "\n" +
		line + "\n" +
		line + "\n" +
		line[blockSize/2:]) // incomplete line

	file.Write(testBytes)
	testCases := []struct {
		name          string
		max           int64
		longerThanMax bool
		expected      string
	}{
		{