Testing our ViewModels

Our ViewModel class fetches data from the repository and exposes it to the UI. To test our ViewModel, we will write unit tests. Let us start by setting up the test dependencies in our version catalog:

1. Open the libs.version.toml file and add the following versions in the versions section:

   mockk = "1.13.3"

2. Next, in the libraries section, add the following:

   test-mockk = { module = "io.mockk:mockk", version.ref = "mockk" }

3. Add the test-mockk dependency to the test bundle. Our updated test bundle should now look like this:

   test = ["test-mock-webserver", "test-coroutines", "test-truth", "test-mockk"]

4. Click on the Sync Now button at the top to add the dependencies. Adding mockk allows us to mock our dependencies.
5. We are now ready to create our test class. Create a new Kotlin file called CatsViewModelTest.kt inside the test directory and add the following code:

   class PetsViewModelTest...