trigger keybord event with key property isn't working in v1.1.4

[andreeapanait99]

Subject of the issue

After the release of the 1.1.4 version, some of my tests that cover keyboard events fail. To be more specific, the tests in which I pass the key as a property of the event. This way is described in VTU documentation (https://vue-test-utils.vuejs.org/guides/dom-events.html#keyboard-example):

await wrapper.trigger('keydown', {
      key: 'a'
})

I could replace all keys with their respective keyCodes in my tests, however since this method is specified in the official docs and it was working in version 1.1.3 and below, I belive this is a bug.

Steps to reproduce

Let's take a simple Vue component. In template:
<div @keyup="$_handleKeyUp"> </div>

In script:

$_handleKeyUp(event) {
            if (event.key === KEY_VALUE.SPACE || event.key === KEY_VALUE.ENTER) {
                // do sth
            }
}

In tests, I want to verify if that something happens. So, I trigger an event with key ENTER.

await root.trigger('keyup', {
           key: 'Enter'
});

Expected behaviour

The test should pass.

Actual behaviour

The test fails. This also applies to any other keys I have tested (space - ' ', left - ArrowLeft, right - ArrowRight).

It's worth mentioning that replacing key with its respective keyCode does indeed make the test pass.

await root.trigger('keyup', {
           keyCode: 13
});

Passing the key as a modifier also works:

await root.trigger('keyup.enter');

Downgrading to version 1.1.3 also makes the tests pass.

Possible Solution

I belive this could be because of the modifications done in #1808.
I also noticed you don't have any test for these type of key events (with key as a parameter), or at least I could only find ones with keyCodes or modifiers; it might be worth adding a tests for this case as well to prevent further issues.