public void AddItemsTest()
{
// Arrange: set up a context mock with an empty collection of root items, exposed through a provider mock.
Mock <IMyContext> myContextMock = new Mock <IMyContext>();
var myRootItems = new DbSetMock <MyRootItem>();
myContextMock.Setup(m => m.MyRootItems).Returns(myRootItems);
Mock <IMyContextProvider> myContextProvider = new Mock <IMyContextProvider>();
myContextProvider.Setup(m => m.CreateContext()).Returns(myContextMock.Object);
// Act: create the service instance and call AddItems operation.
var service = new MyService(myContextProvider.Object);
service.AddItems();
// Assert: verify that the context is created, and that the side effects are as expected.
myContextProvider.Verify(m => m.CreateContext());
Assert.AreEqual(2, myRootItems.Count());
}
