public class NewEditModeTest {

    [Test]
    public void NewEditModeTestSimplePasses() {
        // Use the Assert class to test conditions.
    }

    // A UnityTest behaves like a coroutine in PlayMode
    // and allows you to yield null to skip a frame in EditMode
    [UnityTest]
    public IEnumerator NewEditModeTestWithEnumeratorPasses() {
        // Use the Assert class to test conditions.
        // yield to skip a frame
        yield return null;
    }
}

public class NewEditorTest {

    [Test]
    public void EditorTest() {
        //Arrange
        var gameObject = new GameObject();

        //Act
        //Try to rename the GameObject
        var newGameObjectName = "My game object";
        gameObject.name = newGameObjectName;

        //Assert
        //The object has a new name
        Assert.AreEqual(newGameObjectName, gameObject.name);
    }
}