A test using callbacks instead of Verify from Moq.

gistfile1.cs

[Test]
public void SomeTest() {
    // Arrange
    var mock = new Mock<IDependency>();
    string string1 = null;
    string string2 = null;
    mock
        .Setup(x => x.AMethodCall(It.IsAny<string>(), It.IsAny<string>()))
        .Callback<string, string>((s1, s2) =>
            {
                string1 = s1;
                string2 = s2;
            });
    var sut = new ServiceUnderTest(mock.Object);

    // Act
    sut.DoIt();

    // Assert
    Assert.That(string1, Is.EqualTo("Hello"));
    Assert.That(string2, Is.EqualTo("World"));
}