always use an ApplicationInstance as the test owner

[NullVoxPopuli-ai-agent]

An alternative to #1584, from this question: can the copied Ember internals be deleted, not rewritten?

They can. The test owner is now always an ApplicationInstance.

Change

Before, the owner was a mock in two cases:

• setResolver() without setApplication()
• the resolver option of setupContext(), also when an application is set

The mock was an EmberObject with RegistryProxyMixin and ContainerProxyMixin, on a registry built by hand with private Ember API.

Now buildOwner() creates an Application that has only the resolver, and builds the instance from it. The application is destroyed together with the instance.

Deleted:

• addon/src/-internal/build-registry.ts
• the _emberTestHelpersMockOwner flag, and its special cases in setupRenderingContext() and getRootElement()
• the imports from the container, runtime and views packages of @ember/-internals

@ember/test-helpers no longer calls EmberObject.extend() at import time. That call is what stops emberjs/ember.js#21673.

Breaking

• The container of the mock owner had the old registry methods (container.register, container.resolve and others). They are gone.
• The resolver-only owner now boots as an application instance. An event dispatcher is set up in setupContext(), not only in setupRenderingContext().

setResolver() and the resolver option stay, so engineResolverFor from ember-engines continues to work. I did not run the ember-engines tests.

Results

Test app in this repo, full suite:

Ember	Result
5.12 (default)	563 of 563 pass
4.4	563 of 563 pass
canary	564 of 564 pass
release	559 of 559 pass, before the strict resolver tests were added

Strict resolver

tests/unit/strict-resolver-test.js uses ember-strict-application-resolver in the three ways an owner is built:

• setResolver() with a StrictResolver and no application
• the resolver option of setupContext()
• setApplication() with a strict application

Each one gives an ApplicationInstance that resolves a service from modules, and render() works.

emberjs/ember.js at the commit of emberjs/ember.js#21673, full suite, with the dist of this branch in place of @ember/test-helpers 5.5.0:

Mode	5.5.0	This branch
default	9530 pass	9530 pass
ALL_DEPRECATIONS_ENABLED=true	the page does not load	9530 pass
OVERRIDE_DEPRECATION_VERSION=15.0.0	the page does not load	8074 pass, 619 skipped

ember.js calls setApplication(), so its tests did not use the mock owner. Only the import-time EmberObject.extend() broke it.

🤖 Generated with Claude Code