That's your setup. Act, do something. And then finally, assert against that world. So notice A-A-A, the three A's. And all of your tests are going to follow this shape. Arrange, act, assert. Arrange, act, assert. And notice how I use spaces to divide each of those sections. Very, very common stuff. Okay.

Very, very common stuff. Okay. So with that in mind, notice that the arrangement for all of our tests involve creating a tag parser. One, two, three, four, in every single case. Now in this situation, it's not really a big deal. It's a simple instantiation. But often to instantiate tag parser will require three different dependencies that need to be instantiated. And if you don't have a factory class or something like that, it can be a little bit of work.