Let’s say you have an existing Unity game and you would like to test a prefab exclusively by itself. No problem, you’ve come to the right place. You can do this using what is called a Play Mode unit test. Here is some sample code to help get you started:
[UnityTest]
[Timeout(180000)] // Sets the timeout of the test in milliseconds (if the test hangs, this will ensure it closes after 3 minutes).
public IEnumerator TestAnimationAnimUtilityPrefab()
{
// Remove the default skybox.
RenderSettings.skybox = null;
// Create a new root game object.
var root = new GameObject();
// Attach a camera to our root game object.
root.AddComponent(typeof(Camera));
// Get a reference to the camera.
var camera = root.GetComponent<Camera>();
// Set the camera's background color to white.
camera.backgroundColor = Colors.white;
// Add our game object (with the camera included) to the scene by instantiating it.
root = GameObject.Instantiate(root);
// Load a prefab (by giving it the path to an existing prefab).
var prefab = AssetDatabase.LoadAssetAtPath<GameObject>("Assets/Example.prefab");
// Instantiate the prefab (by adding it to the scene). Use the Quaternion to set the rotation in degrees and the Vector3 to set the position in 3D space.
prefab = GameObject.Instantiate(prefab, new Vector3(0, 0, 10), new Quaternion(0, 180, 0, 0));
// Wait for three seconds (this gives us time to see the prefab in the scene if its an animation or something else).
yield return new WaitForSeconds(3f);
// In this example, let's assume that our Example.prefab has a script on it called ExampleScript.
var script = prefab.gameObject.GetComponentInChildren<ExampleScript>();
// Assert that the script exists on our prefab so we don't stumble upon this problem in the future.
Assert.IsTrue(script != null, "ExampleScript must be set on Example.prefab.");
// Finally, we should clean up our scene by destroying our objects.
GameObject.Destroy(prefab);
GameObject.Destroy(root);
}