To run this test manually:
Enter something to the text field and choose files with the files choosers.
Click here to navigate away from the page.
Click here to navigate back to the page.
Check that the state of the form was restored.
Test that the state of a file chooser is recovered when navigating away and navigating back.
On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
PASS document.getElementById('text-input').value is "text to be posted"
PASS fileContents[0].actual is "Hello"
PASS fileContents[1].actual is "Hello"
PASS fileContents[2].actual is "Another"
PASS successfullyParsed is true
TEST COMPLETE