How do I verify a method was called exactly once with Moq?

Question

How do I verify a method was called exactly once with Moq? The Verify() vs. Verifable() thing is really confusing.

Answer 1

You can use Times.Once(), or Times.Exactly(1):

mockContext.Verify(x => x.SaveChanges(), Times.Once());
mockContext.Verify(x => x.SaveChanges(), Times.Exactly(1));

Here are the methods on the Times class:

• AtLeast - Specifies that a mocked method should be invoked times times as minimum.
• AtLeastOnce - Specifies that a mocked method should be invoked one time as minimum.
• AtMost - Specifies that a mocked method should be invoked times time as maximum.
• AtMostOnce - Specifies that a mocked method should be invoked one time as maximum.
• Between - Specifies that a mocked method should be invoked between from and to times.
• Exactly - Specifies that a mocked method should be invoked exactly times times.
• Never - Specifies that a mocked method should not be invoked.
• Once - Specifies that a mocked method should be invoked exactly one time.

Just remember that they are method calls; I kept getting tripped up, thinking they were properties and forgetting the parentheses.