void Verify()

This example sets up an expectation and marks it as verifiable. After the mock is used, a Verify()()() call is issued on the mock to ensure the method in the expectation was invoked:

CopyC#

var mock = new Mock<IWarehouse>();
mock.Expect(x => x.HasInventory(TALISKER, 50)).Verifiable().Returns(true);
...
// other test code
...
// Will throw if the test code has didn't call HasInventory.
mock.Verify();