This repo reproduces an event issue.

npm install
npm start

The <my-parent> component:

• adds an event listener for "my-event" in the constructor
• renders the component <my-child> in its JSX template

The <my-child> component:

• dispatches a "my-event" event in the componentDidLoad lifecycle method

<my-parent>should receive the "my-event" event from <my-child>. This works as expected in the browser, but not in the SPEC test.

To demonstrate this, 3 messages are logged to the console:

1. "adding event listener" by <my-parent>
2. "dispatching event" by <my-child>
3. "event received" by <my-parent>

In the browser, all three messages are logged. In "my-parent.spec.ts" only the first two messages are logged. The event handler is not being called.