How to verify that method was NOT called in Moq?

Question

How do I verify that method was NOT called in Moq?

Does it have something like AssertWasNotCalled?

UPDATE: Starting from Version 3.0, a new syntaxt can be used:

mock.Verify(foo => foo.Execute("ping"), Times.Never());

Answer 1

Use .AtMostOnce();

After the real test, call the method again. If it throws an exception, it was called.

Answer 2

Either, make your mock strict so it will fail if you call a method for which you don't have an expect

new Mock<IMoq>(MockBehavior.Strict)

Or, if you want your mock to be loose, use the .Throws( Exception )

var m = new Mock<IMoq>(MockBehavior.Loose);
m.Expect(a => a.moo()).Throws(new Exception("Shouldn't be called."));

Answer 3

Actually, it's better to specify .AtMost(0) after the Returns statement.

var m = new Mock<ISomething>();
m.Expect(x => x.Forbidden()).Returns("foo").AtMost(0);

Although the "throws" also works, AtMost(0) is more expressive IMHO.

Edit This does not work in recent versions of Moq (since at least 3.1), it should be specified in the Verify method as mentioned in the answer.

Answer 4

Stolen from: http://stackoverflow.com/questions/1073846/need-help-understand-moq-better/1080774#1080774

One of the things that you might want to test is that the pay method does not get called when a person aged over 65 is passed into the method

[Test]
public void Someone_over_65_does_not_pay_a_pension_contribution() {
    Mock<IPensionService> mockPensionService = new Mock<IPensionService>();
    Person p = new Person("test", 66);
    PensionCalculator calc = new PensionCalculator(mockPensionService.Object);
    calc.PayPensionContribution(p);
    mockPensionService.Verify(ps => ps.Pay(It.IsAny<decimal>()), Times.Never());
}

Answer 5

Run a verify after the test which has a "Times.Never" enum set. e.g.

_mock.Object.DoSomething()
_mock.Verify(service => service.ShouldntBeCalled(),Times.Never());