public async Task WriteLog_EmptyString_ThrowsException()
{
// Arrange
using var memStream = new MemoryStream();
var mockStreamFactory = Mock.Of <IStreamFactory>(sf => sf.GetStream() == memStream);
var sut = new StreamLogWriter(mockStreamFactory);
// Act, Assert
await Assert.ThrowsAsync <ArgumentException>(() => sut.WriteLogAsync(_id, _timeStamp, string.Empty));
}
public async Task WriteLog_ValidInput_WritesLogEntryToStream()
{
// Arrange
using var memStream = new MemoryStream();
var mockStreamFactory = Mock.Of <IStreamFactory>(sf => sf.GetStream() == memStream);
var sut = new StreamLogWriter(mockStreamFactory);
// Act
await sut.WriteLogAsync(_id, _timeStamp, _message);
var result = Encoding.Default.GetString(memStream.ToArray());
// Assert
Assert.Contains(_id.ToString(), result);
Assert.Contains(_timeStamp.ToString("s"), result);
Assert.Contains(_message.ToString(), result);
}