这是它在 .RAZOR 页面中显示的元素：

<button id="@(theID)" type="button" class="btn btn-primary" onclick="window.open('https://www.google.com/');">Do Something</button>

我在 bUnit 测试 .CS 文件中有这个语句：

IElement theButton = cut.Find("button[id=\"" + theID + "\"]");
exportButton.MarkupMatches("<button id=\"" + theID + "\" type=\"button\" class=\"btn btn-primary\" onclick=\"window.open('https://www.google.com/');\">Do Something</button>");
exportButton.Click();

bUnit 通过了 exportButton.MarkupMatches() 测试，因为这是 bUnit 接收的标记中的内容：

<button id="abc123" type="button" class="btn btn-primary" onclick="window.open('https://www.google.com/');">Do Something</button>

但是，bUnit 失败的是 Click()。错误信息是这样的：

My.Domain.Tests.TestTheThing
    Source: MyAwesomeTest.razor line N
    Duration: 485 ms

    Message:
        Bunit.MissingEventHandlerException : The element does not have an event handler for the event 'onclick', nor any other events.

    Stack Trace:
        TriggerEventDispatchExtensions.TriggerBubblingEventAsync(ITestRenderer renderer, IElement element, String eventName, EventArgs eventArgs) line 102
        TriggerEventDispatchExtensions.TriggerEventAsync(IElement element, String eventName, EventArgs eventArgs) line 76
        MouseEventDispatchExtensions.ClickAsync(IElement element, MouseEventArgs eventArgs) line 373
        MouseEventDispatchExtensions.Click(IElement element, Int64 detail, Double screenX, Double screenY, Double clientX, Double clientY, Double offsetX, Double offsetY, Int64 button, Int64 buttons, Boolean ctrlKey, Boolean shiftKey, Boolean altKey, Boolean metaKey, String type) line 322
        MyAwesomeTest.TestTheThing() line N
        <>c.<ThrowAsync>b__140_0(Object state)

从 bUnit 接收的标记中可以清楚地看到：

<button id="abc123" type="button" class="btn btn-primary" onclick="window.open('https://www.google.com/');">Do Something</button>

确实有一个 onclick 事件需要处理。

那么为什么测试失败了呢？为什么 bUnit 说没有可处理的事件，即使有。