Migrate 3 Mocha+Enzyme test files to Jest

[tim-lai]

Content & configuration

Is your feature request related to a problem?

The 3 remaining Mocha-based test files are all related to Enzyme, and currently fail on Jest with both enzyme@2 and enzyme@3.

Reason: Consolidate testing framework.

Describe the solution you'd like

The 3 remaining Mocha-based test files should be refactored for Jest+Enzyme. Ideally, the replacement test files should be in Enzyme 3.

Describe alternatives you've considered

May also consider using Jest + Testing Library, instead of Jest + Enyzme

Additional context

related to #6487

[iamjoross]

@tim-lai , I am interested to work on this. Can I be assigned to this task?

[tim-lai]

@iamjoross Sure! Assigned!

[tim-lai]

Update: SwaggerUI@4 uses enzyme@3. mocha@9 breaks CI/CD due to issue with transpiling .jsx files with babel + native esm. Refer to comment at bottom of @babel/register docs

Note: @babel/register does not support compiling native Node.js ES modules on the fly, since currently there is no stable API for intercepting ES modules loading.

Sidenote, SwaggerEditor uses mocha@9.2.0, but for a single a vanilla .js test file.