public void Junior_Dev_Accidentally_Changes_Identity_And_Equality_In_Second_Method()
{
var lineItem1 = new LineItem { Id = 35, Description = "Shirt", InvoiceNumber=10001 };
var lineItem2 = new LineItem { Id = 35, Description = "Shirt", InvoiceNumber=10002 };
var sut = new Invoice { Id = 1 };
Assert.AreEqual(0, sut.LineItems().Count());
sut.AddLineItemAlternateCreatedByMaintenanceTeamAccidentallySixMonthsLater(lineItem1);
sut.AddLineItemAlternateCreatedByMaintenanceTeamAccidentallySixMonthsLater(lineItem2);
Assert.AreEqual(1, sut.LineItems().Count(), "LineItems should only increment for unique Id");
}
public void AddLineItem_Checks_Identity_and_Equality_Based_On_Id_Property()
{
var lineItem1 = new LineItem { Id = 35, Description = "Shirt" };
var lineItem2 = new LineItem { Id = 35, Description = "Shirt" };
var sut = new Invoice { Id = 1 };
Assert.AreEqual(0, sut.LineItems().Count());
sut.AddLineItem(lineItem1);
sut.AddLineItem(lineItem2);
Assert.AreEqual(1, sut.LineItems().Count(), "LineItems should only increment for unique Id");
}
public void LineItems_Is_Dictionary_Encapsulated_As_IEnumerable()
{
var sut = new Invoice { Id = 1 };
Assert.IsInstanceOf(typeof(IEnumerable<KeyValuePair<int,LineItem>>), sut.LineItems());
}
public void Equality_Is_Maintained_By_POCO_Internally()
{
var sut1 = new Invoice { Id = 1234, InvoiceDate = DateTime.Today };
var sut2 = new Invoice { Id = 1234, InvoiceDate = DateTime.Today.AddDays(-1) };
Assert.AreEqual(sut1, sut2, "Equality should be based on Id only.");
}
