SenderProperty.razor

@using Moq
@using Microsoft.AspNetCore.Http
@using Microsoft.AspNetCore.Routing
@inherits BunitContext

@code {

	private object capturedSender = null;
	private string commandName = string.Empty;
	private object commandArg = null;

	void OnCommand(CommandEventArgs args)
	{
		capturedSender = args.Sender;
		commandName = args.CommandName;
		commandArg = args.CommandArgument;
	}

	[Fact]
	public void Button_Command_PopulatesSenderProperty()
	{
		// Arrange
		Services.AddSingleton<LinkGenerator>(new Mock<LinkGenerator>().Object);
		Services.AddSingleton<IHttpContextAccessor>(new Mock<IHttpContextAccessor>().Object);
		capturedSender = null;
		var cut = Render(@<Button CommandName="TestCommand" CommandArgument="@("TestArg")" OnCommand="OnCommand">Test Button</Button>);

		// Act
		cut.Find("button").Click();

		// Assert
		capturedSender.ShouldNotBeNull();
		capturedSender.ShouldBeOfType<Button>();
		commandName.ShouldBe("TestCommand");
		commandArg.ShouldBe("TestArg");
	}

	[Fact]
	public void Button_Command_SenderIsTheButtonInstance()
	{
		// Arrange
		Services.AddSingleton<LinkGenerator>(new Mock<LinkGenerator>().Object);
		Services.AddSingleton<IHttpContextAccessor>(new Mock<IHttpContextAccessor>().Object);
		Button buttonRef = null;
		capturedSender = null;
		var cut = Render(@<Button @ref="buttonRef" CommandName="TestCmd" CommandArgument="@("Arg")" OnCommand="OnCommand" Text="Click" />);
		var buttonInstance = cut.FindComponent<Button>().Instance;

		// Act
		cut.Find("button").Click();

		// Assert
		capturedSender.ShouldBe(buttonInstance);
	}

}