public void SendEmailTestArray() { //Arrange var vendorRepository = new VendorRepository(); var vendors = vendorRepository.RetrieveArray(); var expected = new List <string>() { "Message sent: Important email for: ABC Corp", "Message sent: Important email for: XYZ Inc", }; //Act var actual = Vendor.SendEmail(vendors, "Test Message"); //Assert Assert.Equal(expected, actual); }