public static async Task ShouldNotAddNode <TNode>(this IMixerViewModel mixer,
IInteractionService interactions,
INodeFactory nodeFactory,
Func <IMixerViewModel, Task> command)
where TNode : INode
{
// Arrange
var isInvoked = false;
interactions.GetNewNodePoint
.RegisterHandler(i =>
{
isInvoked = true;
i.SetOutput(null);
});
// Act
mixer.Activator
.Activate();
await command(mixer);
// Assert
isInvoked.Should().BeTrue();
nodeFactory.DidNotReceive().Create <TNode>();
mixer.Nodes.IsEmpty.Should().BeTrue();
}