public void ConcatErrors_TotalTwo() { var resultErrorInitial = new ResultError(CreateErrorTest()); var errorToConcat = CreateErrorTest(); var resultErrorConcatted = resultErrorInitial.ConcatErrors(errorToConcat); Assert.True(resultErrorConcatted.HasErrors); Assert.Equal(2, resultErrorConcatted.Errors.Count); Assert.True(errorToConcat.Equals(resultErrorConcatted.Errors.Last())); }