public void AddNewMember_AddsAMemberToList_ReturnsCorrectCount() { //Arrange var options = new DbContextOptionsBuilder <ApplicationDbContext>() .UseInMemoryDatabase("Member_AddNewMember").Options; var context = new ApplicationDbContext(options); SeedMockData(context); var memberToAdd = new Member { Name = "Test To Add" }; var testMemberService = new MemberService(context); var expectedCountNr = 5; //Act testMemberService.AddNewMember(memberToAdd); var actualCountNr = context.Member.ToList().Count; //Assert Assert.Equal(expectedCountNr, actualCountNr); }