CONSOLE WARNING: line 41: Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.
Test that filename passed to FormData.append() takes precedence over filename in File.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".

Sending FormData containing one file with custom filename:
file1=custom-name.txt:text/plain:1234567890
PASS successfullyParsed is true

TEST COMPLETE