Add PHPUnit tests workflow for multisite

[thelovekesh]

Summary

Fixes #5701

This PR also updates deprecated set-output commands in GitHub Actions workflow files. See https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Checklist

• My code is tested and passes existing tests.
• My code follows the Engineering Guidelines (updates are often made to the guidelines, check it out periodically).

[thelovekesh]

@westonruter I have configured workflow for both testsuites i.e. default and external-http. Some tests seem to be failing mainly from helper functions. Should I fix them in the same PR? Can you please take a look if any test is need to be skipped?

[westonruter]

Interesting. Yes, they should be fixed in this PR. For each failure, I'd suggest checking to see what the cause of the failure is. It may be due to a regular admin user not having all the same privileges as a superadmin on multisite. Therefore the fix may be just to check if its multisite, and then grant the user being tested with superadmin privileges.

Some tests probably also should be skipped if the functionality specifically is not available in multisite. For example, installing themes from the onboarding wizard I don't think is available on multisite.

It'll be interesting to see if this uncovers actual bugs with the code and not just incomplete tests!

[thelovekesh]

@westonruter I believe the capability here should be install_themes. Thoughts?

amp-wp/src/Admin/AfterActivationSiteScan.php

Line 214 in 650a4eb

if ( current_user_can( 'switch_themes' ) ) {

[codecov]

Codecov Report

Merging #7321 (deb6e3c) into develop (9f6567c) will decrease coverage by 0.80%.
The diff coverage is n/a.

❗ Current head deb6e3c differs from pull request most recent head 17dd543. Consider uploading reports for the commit 17dd543 to get more accurate results

@@              Coverage Diff              @@
##             develop    #7321      +/-   ##
=============================================
- Coverage      78.60%   77.80%   -0.81%     
  Complexity      6852     6852              
=============================================
  Files            209      276      +67     
  Lines          18655    19814    +1159     
=============================================
+ Hits           14664    15416     +752     
- Misses          3991     4398     +407     

Flag	Coverage Δ
javascript	64.88% <ø> (?)
php	78.60% <ø> (ø)
unit	78.60% <ø> (ø)

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

Impacted Files	Coverage Δ
assets/src/components/conditional-details/index.js	100.00% <0.00%> (ø)
assets/src/common/helpers/index.js	91.22% <0.00%> (ø)
.../src/onboarding-wizard/components/stepper/index.js	66.66% <0.00%> (ø)
...s/amp-validation-status/revalidate-notification.js	100.00% <0.00%> (ø)
assets/src/block-editor/constants.js	100.00% <0.00%> (ø)
assets/src/components/amp-drawer/index.js	73.07% <0.00%> (ø)
assets/src/components/amp-admin-notice/index.js	100.00% <0.00%> (ø)
...sets/src/block-validation/components/icon/index.js	100.00% <0.00%> (ø)
assets/src/components/dev-tools-toggle/index.js	80.00% <0.00%> (ø)
...ts/src/common/helpers/test/fixtures/mockClasses.js	100.00% <0.00%> (ø)
... and 57 more

[westonruter]

I believe the capability here should be install_themes. Thoughts?

@thelovekesh yes, I think you're right. The page requires install_themes: https://github.com/WordPress/wordpress-develop/blob/04f55a430e2ee5a88e9b5b5485b75a68fabd5a83/src/wp-admin/theme-install.php#L15-L17