Your First Test
It is time to start using these asserts.
You will be writing unit tests against RanchForecast, tests that verify that the classes in the app work individually. If you were writing tests for app-wide functionality, you might put them in RanchForecastTests.swift. However, as it is you do not have any use for this file since all of your tests will be class-specific. Go ahead and delete the file.
The first class that you will write tests for is Course. To make it obvious which class you are testing in a given test, you will create a separate test file and XCTestCase subclass for each of the classes in the project. In the project navigator, right-click on the RanchForecastTests group, and select New File....
Create a ...
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