public void IsNoLongerThan256_WhenStringIsNoLongerThan256_Succeeds(string value)
 {
     var data = new FileData { StringValue = value };
     Assert.LessOrEqual(value.Length, 256);
     Assert.DoesNotThrow(() => data.IsNoLongerThan256());
 }
 public void IsNoLongerThan256_WhenStringIsLongerThan256_Throws(string value)
 {
     var data = new FileData { StringValue = value };
     Assert.Greater(value.Length, 256);
     Assert.Throws<ArgumentException>(() => data.IsNoLongerThan256());
 }