Docs: Trigger event handlers

Author: egil

docs/samples/components/ClickMe.razor

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+<button @onclick="ClickHandler">Click ME!</button>
+@code
+{
+  void ClickHandler(MouseEventArgs args)
+  {
+    // ...
+  }
+}

docs/samples/tests/razor/ClickMeTest.razor

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+@inherits TestComponentBase
+
+<Fixture Test="ClickingButtonWorks">
+  <ComponentUnderTest>
+    <ClickMe />
+  </ComponentUnderTest>
+
+  @code
+  {
+    void ClickingButtonWorks(Fixture fixture)
+    {
+      // Arrange
+      var cut = fixture.GetComponentUnderTest<ClickMe>();
+      var buttonElement = cut.Find("button");
+
+      // Act
+      buttonElement.Click();
+      buttonElement.Click(detail: 3, ctrlKey: true);
+      buttonElement.Click(new MouseEventArgs());
+      
+      // Assert
+      // ...
+    }
+  }
+</Fixture>

docs/samples/tests/xunit/ClickMeTest.cs

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+using Microsoft.AspNetCore.Components.Web;
+using Xunit;
+using Bunit;
+
+namespace Bunit.Docs.Samples
+{
+  public class ClickMeTest
+  {
+    [Fact]
+    public void ClickingButtonWorks()
+    {
+      // Arrange
+      using var ctx = new TestContext();
+      var cut = ctx.RenderComponent<ClickMe>();
+      var buttonElement = cut.Find("button");
+
+      // Act
+      buttonElement.Click();
+      buttonElement.Click(detail: 3, ctrlKey: true);
+      buttonElement.Click(new MouseEventArgs());
+
+      // Assert
+      // ...
+    }
+  }
+}