func randSeq() string {
	b := make([]rune, 30)
	for i := range b {
		b[i] = letters[rand.Intn(len(letters))]
	}
	return string(b)
}

func TestWriteCountLines(t *testing.T) {
	testCases := []struct {
		name     string
		expected int
	}{
		{
			name:     "write no line",
			expected: 0,
		},
		{
			name:     "write one line",
			expected: 1,