public void GenerateTimeStamp_ValidTimeStamp(HttpUtils sut) { var currentTime = DateTime.UtcNow - new DateTime(1970, 1, 1); var timestamp = sut.GenerateTimeStamp(); var value = long.Parse(timestamp); value.Should().BeInRange(Convert.ToInt64(currentTime.TotalSeconds), Convert.ToInt64(currentTime.TotalSeconds) + 1); }