Error thrown on computing string sizes in FormData.

[lonelam]

Is this issue a feature request or a bug report?

🐛Bug Report

What is the current behavior?
The script throws exception when sending post request on mock scene.

Inspecting stack trace of the error, the util function getStringByteLength in src/Utils.js seems using the native Blob to get the length of a string.

🪧Step to reproduce

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.

// inject mock-xmlhttprequest somewhere.
const formData = new FormData();
formData.append('name', 'some string in form');
axios.post('https://google.com/', formData, {}, {});

What is the expected behavior?

Maybe it should not throw the error?
Environment in which you encounter the issue:

• mock-xmlhttprequest version: 7.0.4
• Chrome version: Version 103.0.5060.114 (Official Build) (x86_64)
• OS version: MacOS Big Sur

Did this work in a previous version of mock-xmlhttprequest (which)?
Have no idea about previous version of mock-xmlhttprequest.
Do you intend to provide a pull request to address this issue?

🚧fixing PR

The issue is clear: we should use new Blob([string], {type: 'text/plain'}); to create a Blob according to latest
MDN document, I'm creating an PR for this bugfix.

[berniegp]

This is fixed in v8.0.0.