Mocking a void methid with Moq

We use the Callback() method rather than the Returns() method.

_numberGeneratorServiceMock = new Mock<INumberGeneratorService>();
_numberGeneratorServiceMock.Setup(m => m.PrintNumber(It.IsAny<int>()))
    .Callback((int number) => Debug.Print(number.ToString(CultureInfo.InvariantCulture)));
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