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    14. Preserve test state

    Learning objectives

    This section will cover how to let variables and information in your tests survive domain reloads using serialization.

    Intro and motivation

    When a domain reload happens, all scripts are reloaded. That also means that most data in members of the test class are lost. In some cases that is an issue, as you might want to retain some information during a domain reload.

    The solution to that is serialization. If you add a [SerializeField] attribute to the field in question, then it will retain its value. Note that there are some limitations to serialization in Unity, see Unity Serialization.

    Exercise

    The sample 14_PreserveTestState contains the solution for the previous assignment, with one exception; the file name is now a guid.

    This means that in order to clean up correctly, the TearDown method needs to know the filename.

    Currently, when running the test for the first time, the TearDown will fail because it's not given a file name. On subsequent runs of the test, it will fail due to duplicate files with the same C# script in it.

    The task is to fix this loss of the file name info by using serialization.

    Solution

    The solution is simple. Just add a [SerializeField] attribute to the filename field. The solution is included as sample 14_PreserveTestState_Solution.

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