forked from BilalY/Rasagar
52 lines
1.9 KiB
Markdown
52 lines
1.9 KiB
Markdown
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# 9\. Using the UnityTest Attribute
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## Learning objectives
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This section will introduce you to the custom `[UnityTest]` Attribute, which allows for creating tests that run over multiple frames.
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## Intro and motivation
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An important extension to the Nunit framework that we've made is introducing the `[UnityTest]` attribute. The attribute allows for creating tests that can yield and resume running after a certain condition. Therefore the test must have the return type of `IEnumerator`. You can then yield back a yield instruction or null, like so:
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```
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[UnityTest]
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public IEnumerator MyTest()
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{
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DoSomething();
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// Skip 1 frame.
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yield return null;
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DoSomethingElse();
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}
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```
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In the snippet above we call the `DoSomething` method, then skip one frame before calling the `DoSomethingElse` method.
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For more information on the yield keyword in C#, see the [Microsoft documentation](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/yield).
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## Exercise
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In the [sample](./welcome.md#import-samples) `9_UnityTestAttribute` you will find a Play Mode test assembly set up with one Play Mode test in it. The PlayMode test does not have a body yet, but there is a function called `PrepareCube()` which will set up a cube with some physics applied.
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The task is to initialize the cube and then verify that it has moved after one frame has passed.
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## Solution
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The full solution is available in the `9_UnityTestAttribute_Solution` sample.
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```
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[UnityTest]
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public IEnumerator CubeMovesDown()
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{
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var cubeUnderTest = PrepareCube();
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var initialPosition = cubeUnderTest.transform.position;
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yield return null;
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Assert.That(cubeUnderTest.transform.position, Is.Not.EqualTo(initialPosition));
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}
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```
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## Further reading and resources
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[UTF documentation regarding UnityTest attribute](https://docs.unity3d.com/Packages/com.unity.test-framework@1.1/manual/reference-attribute-unitytest.html)
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