[NullVoxPopuli-ai-agent]

Summary

Drops ember-cli-fastboot, ember-cli-fastboot-testing, the lone tests/fastboot/if-demo-test.js, and the fastbootDependencies block from test-app/package.json. There's no FastBoot runtime behavior the addon's own tests rely on. (The typeof FastBoot === 'undefined' guard inside addon/src/components/animated-each.gts is a defensive check for downstream consumers and stays.)

Adds !important to the existing inline #ember-testing { transform: none } override in test-app/tests/index.html — see below for why.

What about ember-modal-dialog?

The 4.0.0 pnpm override is left in place. Test-app source never imported it, but docs/'s ember-cli-addon-docs chain depends on it transitively, and floating to 4.1.5 breaks the docs search-functionality acceptance test (waitFor timed out waiting for selector \"[data-test-search-result-list]\"). I tried removing it and CI surfaced the regression — separate cleanup, separate PR.

Why the !important

Removing ember-cli-fastboot shifts ember-auto-import's webpack pipeline: with fastboot, @ember/test-helpers' CSS gets extracted into a separate chunk linked in <head> before the inline override. Without fastboot, the same CSS is inlined into JS and injected via style-loader at runtime — after the inline override. Same specificity, later rule wins, so the default #ember-testing { transform: scale(0.5); width: 200% } was beating the override and bounds-based tests started measuring at half size:

not ok 48 - Integration | Component | animated container: measures at the appropriate time
  actual: 160.5
  expected: 321

not ok 49 - Integration | Component | animated container: unlocks only after own motion is done
  actual: 50
  expected: 100

!important resolves the ordering issue regardless of how/when test-helpers' CSS gets injected.

Test plan

• pnpm --filter test-app test:ember → 255 pass, 0 fail, 5 skip (was 256/0/5; net -1 is the deleted if-demo-test).
• pnpm lint clean in both addon/ and test-app/.
• pnpm --filter ember-animated build succeeds.

🤖 Generated with Claude Code

[SergeAstapov]

for context, fastboot test was to avoid regression like #189

[NullVoxPopuli]

for context, fastboot test was to avoid regression like #189

DOMRect is a standard web api, and any SSR solution worth anything will need to have that available 🙈