Add test cases for input element with form attribute outside form

Co-authored-by: egil <[email protected]>

Author: Copilot

tests/bunit.testassets/SampleComponents/FormWithSubmitElementsOutside.razor

@@ -0,0 +1,13 @@
+<form @onsubmit="Callback" id="form1">
+</form>
+<button type="submit" form="form1" id="submit-button">Submit Button</button>
+<input type="submit" form="form1" id="submit-input" value="Submit Input" />
+
+@code {
+	public bool SubmitWasCalled { get; private set; }
+	
+	private void Callback()
+	{
+		SubmitWasCalled = true;
+	}
+}

tests/bunit.tests/EventDispatchExtensions/FormDispatchExtensionTest.cs

@@ -41,4 +41,24 @@ public void ClickingOnSubmitButtonOutsideTriggersOnsubmitOfForm()
 
 		cut.Instance.SubmitWasCalled.ShouldBeTrue();
 	}
+
+	[Fact]
+	public void ClickingOnSubmitButtonOutsideWithFormAttributeTriggersOnsubmit()
+	{
+		var cut = Render<FormWithSubmitElementsOutside>();
+
+		cut.Find("#submit-button").Click();
+
+		cut.Instance.SubmitWasCalled.ShouldBeTrue();
+	}
+
+	[Fact]
+	public void ClickingOnSubmitInputOutsideWithFormAttributeTriggersOnsubmit()
+	{
+		var cut = Render<FormWithSubmitElementsOutside>();
+
+		cut.Find("#submit-input").Click();
+
+		cut.Instance.SubmitWasCalled.ShouldBeTrue();
+	}
 }