public void TestDataWithStaticIdsTest() { var authorList = new AuthorBuilder().BuildAll(); // Builders & Repositories generate new IDs so it is important to be able to match with different ID var findAuthorThatWasCreatedUsingBuilder = authorList.FirstOrDefault(auth => auth.Surname.Contains("Gold")); var comparisonAuthor = new AuthorBuilder(findAuthorThatWasCreatedUsingBuilder?.Id).EliyahuGoldratt().Build(); Assert.IsTrue(comparisonAuthor.Equals(findAuthorThatWasCreatedUsingBuilder)); }