test: refactor ng-add to make it easier to add moar tests

[davidlj95]

Issue or need

After starting to add more features to the ng-add schematic, noticed that same test code repeats over and over.

Despite being conscious that WET > DRY in tests, the Twice of WET was definitely not twice.

Some things can be abstracted to avoid repeating the same tests around and around.

Proposed changes

Add an abstraction to allow testing whether providers are added or not to the root file (app config / app module): shouldAddRootProvider.

Also extracts util functions into testing directories

Quick reminders

• 🤝 I will follow Code of Conduct
• ✅ No existing pull request already does almost same changes
• 👁️ Contributing docs are something I've taken a look at
• 📝 Commit messages convention has been followed
• 💬 TSDoc comments have been added or updated indicating API visibility if API surface has changed.
• 🧪 Tests have been added if needed. For instance, if adding new features or fixing a bug. Or removed if removing features.
• ⚙️ API Report has been updated if API surface is altered.

[davidlj95]

• test: refactor ng-add to make it easier to add moar tests #974 👈
• main

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (0639ca0) to head (bdcf51d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #974   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           86        86           
  Lines          365       365           
  Branches        52        52           
=========================================
  Hits           365       365           

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[github-actions]

📦 Bundle size (Angular v15)

Git ref: bdcf51d5707bd02dc5b03f2fe8ba7560df221be7

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3665 bytes (3.6KiB)	3665 bytes (3.6KiB)	No change
ngx-meta-json-ld.mjs	352 bytes (352B)	352 bytes (352B)	No change
ngx-meta-open-graph.mjs	1172 bytes (1.2KiB)	1172 bytes (1.2KiB)	No change
ngx-meta-routing.mjs	557 bytes (557B)	557 bytes (557B)	No change
ngx-meta-standard.mjs	959 bytes (959B)	959 bytes (959B)	No change
ngx-meta-twitter-card.mjs	599 bytes (599B)	599 bytes (599B)	No change
Total	7304 bytes (7.2KiB)	7304 bytes (7.2KiB)	No change

[github-actions]

📦 Bundle size (Angular v16)

Git ref: bdcf51d5707bd02dc5b03f2fe8ba7560df221be7

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3705 bytes (3.7KiB)	3705 bytes (3.7KiB)	No change
ngx-meta-json-ld.mjs	367 bytes (367B)	367 bytes (367B)	No change
ngx-meta-open-graph.mjs	1202 bytes (1.2KiB)	1202 bytes (1.2KiB)	No change
ngx-meta-routing.mjs	572 bytes (572B)	572 bytes (572B)	No change
ngx-meta-standard.mjs	974 bytes (974B)	974 bytes (974B)	No change
ngx-meta-twitter-card.mjs	614 bytes (614B)	614 bytes (614B)	No change
Total	7434 bytes (7.3KiB)	7434 bytes (7.3KiB)	No change

[github-actions]

📦 Bundle size (Angular v17)

Git ref: bdcf51d5707bd02dc5b03f2fe8ba7560df221be7

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3205 bytes (3.2KiB)	3205 bytes (3.2KiB)	No change
ngx-meta-json-ld.mjs	217 bytes (217B)	217 bytes (217B)	No change
ngx-meta-open-graph.mjs	931 bytes (931B)	931 bytes (931B)	No change
ngx-meta-routing.mjs	394 bytes (394B)	394 bytes (394B)	No change
ngx-meta-standard.mjs	857 bytes (857B)	857 bytes (857B)	No change
ngx-meta-twitter-card.mjs	487 bytes (487B)	487 bytes (487B)	No change
Total	6091 bytes (6.0KiB)	6091 bytes (6.0KiB)	No change

[github-actions]

📦 Bundle size (Angular v18)

Git ref: bdcf51d5707bd02dc5b03f2fe8ba7560df221be7

Module file	Size	Base size	Difference
ngx-meta-core.mjs	3205 bytes (3.2KiB)	3205 bytes (3.2KiB)	No change
ngx-meta-json-ld.mjs	217 bytes (217B)	217 bytes (217B)	No change
ngx-meta-open-graph.mjs	931 bytes (931B)	931 bytes (931B)	No change
ngx-meta-routing.mjs	394 bytes (394B)	394 bytes (394B)	No change
ngx-meta-standard.mjs	857 bytes (857B)	857 bytes (857B)	No change
ngx-meta-twitter-card.mjs	487 bytes (487B)	487 bytes (487B)	No change
Total	6091 bytes (6.0KiB)	6091 bytes (6.0KiB)	No change

[github-actions]

🎉 This PR is included in version 1.0.0-beta.27 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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