triggerEvent for a "change" event for a file input does not set the value of the input correctly

[MariannaAtPlay]

My app relies on the buildt-in native browser constraint validation API, which uses the value of the input.
Facing an issue with a test with the value of a file input (<input type="file">) being empty ('') after triggering a file upload using triggerEvent, which makes the validation fail

const file = new Blob(['candidate referral with resume upload'],
   { type: 'application/pdf' }
);
file.name = 'Foo-bar.pdf';
await triggerEvent(SELECTORS.FILE_INPUT, 'change',
   { files: [file] }
);

there seems to be a problem with triggerEvent helper, which does not properly set the value of the input

I also tried passing in additional options, but this has not helped:

await triggerEvent(SELECTORS.FILE_INPUT, 'change', {
   files: [file],
   srcElement : { value: 'C:\\fakepath\\Foo-bar.pdf' },
   target : { value: 'C:\\fakepath\\Foo-bar.pdf' }
});

Steps to reproduce the problem:

• create a test with a file input;
• trigger a change event using triggerEvent
• check the value of the input and observing that it's empty

[MariannaAtPlay]

This PR for a different testing library might provide some ideas