public void Handler_ShouldThrowException_WhenUnsubscribing_WhenSubscriptionIsNull()
{
//Arrange
var handler = new Handler();
ContextfulSubscription subscription = null;
//Act
//Assert
Assert.ThrowsException <ArgumentException>(() => handler.Subscribe(subscription));
}
public void Handler_ShouldThrowException_WhenUnsubscribing_WhenEventIsNotSubscribed()
{
//Arrange
var handler = new Handler();
var subscription = new ContextfulSubscription();
//Act
//Assert
Assert.ThrowsException <ArgumentException>(() => handler.Unsubscribe(subscription));
}