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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Reflection;
using Xunit;
namespace System.ComponentModel.Tests
{
public class EventDescriptorTests
{
[Fact]
public void RaiseAddedEventHandler()
{
var component = new DescriptorTestComponent();
var eventHandlerWasCalled = false;
Action eventHandler = () => eventHandlerWasCalled = true;
var eventInfo = typeof(DescriptorTestComponent).GetTypeInfo().GetEvent(nameof(DescriptorTestComponent.ActionEvent));
EventDescriptor eventDescriptor = TypeDescriptor.CreateEvent(component.GetType(), nameof(component.ActionEvent), typeof(Action));
eventDescriptor.AddEventHandler(component, eventHandler);
component.RaiseEvent();
Assert.True(eventHandlerWasCalled);
}
[Fact]
public void RemoveAddedEventHandler()
{
var component = new DescriptorTestComponent();
Action eventHandler = () => Assert.True(false, "EventDescriptor failed to remove an event handler");
EventDescriptor eventDescriptor = TypeDescriptor.CreateEvent(component.GetType(), nameof(component.ActionEvent), typeof(Action));
eventDescriptor.AddEventHandler(component, eventHandler);
eventDescriptor.RemoveEventHandler(component, eventHandler);
// component.Event should now have no handler => raising it should throw a NullReferenceException
Assert.Throws(typeof(NullReferenceException), () => component.RaiseEvent());
}
[Fact]
public void CopyConstructorAddsAttribute()
{
var oldEventDescriptor = TypeDescriptor.CreateEvent(typeof(DescriptorTestComponent), nameof(DescriptorTestComponent.ActionEvent), typeof(Action));
var expectedString = "EventDescriptorTests.CopyConstructorAddsAttribute";
var newAttribute = new DescriptorTestAttribute(expectedString);
EventDescriptor newEventDescriptor = TypeDescriptor.CreateEvent(typeof(DescriptorTestComponent), oldEventDescriptor, new[] { newAttribute });
Assert.True(newEventDescriptor.Attributes.Contains(newAttribute));
}
[Fact]
public void GetComponentType()
{
var componentType = typeof(DescriptorTestComponent);
EventDescriptor eventDescriptor = TypeDescriptor.CreateEvent(componentType, nameof(DescriptorTestComponent.ActionEvent), typeof(Action));
Assert.Equal(componentType, eventDescriptor.ComponentType);
}
[Fact]
public void GetEventType()
{
var eventType = typeof(Action);
var eventDescriptor = TypeDescriptor.CreateEvent(typeof(DescriptorTestComponent), nameof(DescriptorTestComponent.ActionEvent), eventType, null);
Assert.Equal(eventType, eventDescriptor.EventType);
}
}
}
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