public void AddItems_GivenAListOfNewItems_AddsThemToDatabase()
{
// arrange
List <OrderItem> items = new List <OrderItem>();
items.Add(new OrderItem()
{
ID = 30
});
items.Add(new OrderItem()
{
ID = 31
});
items.Add(new OrderItem()
{
ID = 32
});
items.Add(new OrderItem()
{
ID = 33
});
Mock <DbSet <OrderItem> > mockSet = new Mock <DbSet <OrderItem> >();
Mock <OrderDb> mockContext = new Mock <OrderDb>();
mockContext.Setup(c => c.OrderItems).Returns(mockSet.Object);
OrderItemRepository sut = new OrderItemRepository(mockContext.Object);
// act
sut.AddItems(items);
// assert
mockSet.Verify(s => s.AddRange(It.Is <IEnumerable <OrderItem> >(l => l.Count() == 4)), Times.Once());
mockContext.Verify(c => c.SaveChanges(), Times.Once());
}