public async Task AppendAllTextAsync()
{
if (File.Exists(_filePath))
{
File.Delete(_filePath);
}
File.WriteAllText(_filePath, _textContent);
await FileHelper.AppendAllTextAsync(_filePath, _appendContent);
Assert.AreEqual($"{_textContent}{_appendContent}", File.ReadAllText(_filePath));
File.Delete(_filePath);
}
