Hi Rebecca!

We have some videos explaining how to do unit tests and in this part we go through the process of mocking the SLProtocol.

You can watch the video or read a bit of the explanation.
Mainly, I use the Moq library as the example here:

[TestMethod()]
public void Rewrite_PathWithItemsToAbbreviate_ReturnsAbbreviatedPath()
{
    // Arrange
    PathRewriter pathRewriter = new PathRewriter();
    string path = @"Visios\Customers\Skyline\Protocols\Test";
    string expected = @"V\C\Skyline\P\Test";

    var fakeSlProtocol = new Mock<SLProtocol>();

    // Act
    string result = pathRewriter.Rewrite(fakeSlProtocol.Object, path);

    // Assert
    Assert.AreEqual(expected, result);
}

Hope that helps!