These are the only two test files that call request.formData() inside an MSW
handler, and they hold exactly the three tests that failed on CI while passing
locally. The body axios' XHR adapter produces under jsdom is one Node 24's
multipart parser rejects, so the handler threw before reading a field and the
component reported a failed upload. Reading the raw payload asserts the same
thing without depending on the parser.
The helpers built a one-byte File and then redefined size to 100, so the
multipart body and the length it announced disagreed. Node 24 rejects that
while 22 lets it through, which is why only CI saw it: every test that
uploaded such a file and expected success failed, the one expecting an error
passed for the wrong reason, and the KML case with a truthful File was fine.
Maurice