feat: Allow responding with Blob or ArrayBuffer when responseType is blob

[offirgolan]

Currently, when the responseType is blob the body must be a string which is then converted to a utf8 ArrayBuffer which doesn't work for binary data. This allows you to respond with either an ArrayBuffer (which will get converted into a Blob) or Blob.

[codecov]

Codecov Report

Merging #164 into master will increase coverage by 0.25%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   90.54%   90.80%   +0.25%     
==========================================
  Files          13       13              
  Lines         603      609       +6     
==========================================
+ Hits          546      553       +7     
+ Misses         57       56       -1     

Flag	Coverage Δ
#unit	90.80% <33.33%> (+0.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/fake-xhr/index.js	87.46% <33.33%> (+0.50%)	⬆️

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[offirgolan]

@mroderick supportsBlob is always false in index.test.js since those tests are running in node which means all the blob tests aren't even being executed. I feel like this might be a task for a separate PR...

[fearphage]

Missing a test for the new error you added. Looks good otherwise.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[fatso83]

I don't understand why the added tests did not cover the lines it complains about. It seems to exactly hit those lines 🤔

[fatso83]

@offirgolan I just casually looked at pending PRs and found this. Do you have any idea why codecov reports the lines as not being covered? Your tests does seem to catch the exception, so ... ? I saw this was pushed a year ago, so about time it got merged 😃

[offirgolan]

No clue @fatso83. I'd love to get this merged in and published though since I've seen multiple users of pollyjs running into this issue.

[offirgolan]

Actually, @fatso83 check my comment above:

@mroderick supportsBlob is always false in index.test.js since those tests are running in node which means all the blob tests aren't even being executed. I feel like this might be a task for a separate PR...

Implemented test

[offirgolan]

@fatso83 would it be possible to cut a release?