ScriptableObjectUnitTests.cs

public class ScriptableObjectUnitTests
{
    [UnityTest]
    public void Script_ExposesFunctionToBroadcast_MultipleTypesOfGameEvents()
    {
        // Arrange
        var broadcaster = new GameObject().AddComponent<BroadcastGameEvents>();

        var gameEventA = ScriptableObject.CreateInstance<GameEvent>();
        var gameEventB = ScriptableObject.CreateInstance<GameEvent>();
        var gameEventC = ScriptableObject.CreateInstance<GameEvent>();

        var spyEventListenerA = Substitute.For<IZeroObjectEventListener>();
        var spyEventListenerB = Substitute.For<IZeroObjectEventListener>();
        var spyEventListenerC = Substitute.For<IZeroObjectEventListener>();

        gameEventA.RegisterListener(spyEventListenerA);
        gameEventB.RegisterListener(spyEventListenerB);
        gameEventC.RegisterListener(spyEventListenerC);

        broadcaster.gameEvents.Add(gameEventA);
        broadcaster.gameEvents.Add(gameEventB);
        broadcaster.gameEvents.Add(gameEventC);

        // Act
        broadcaster.Broadcast();

        // Assert
        spyEventListenerA.Received().OnEventBroadcast();
        spyEventListenerB.Received().OnEventBroadcast();
        spyEventListenerC.Received().OnEventBroadcast();
    }
}