A simple, autogenerated integration test fails for a component using a translation in ember-intl 6.1.2 about ember-intl HOT 6 CLOSED

I am also experiencing this error on Ember 3.28 (development mode & tests) with Ember-intl 6.1.2. It seems to occur when using a template helper if the service hasn't been injected anywhere else yet. Injecting @service intl into my application route seemed to fix it, but doesn't help tests. Lots of failing tests.

This is a very similar error to what you'd receive from updating a @Tracked variable (used in the template) in a constructor() of a glimmer component.

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To confirm, did you follow the migration guide in https://ember-intl.github.io/ember-intl/docs/guide/migration-5-0-to-6-1#missing-setupintl-results-in-a-runtime-error?

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@ijlee2 Nope. I would not expect to need to follow a migration / upgrading guide when creating an app for the first time with the latest version. This probably needs to be in the README.

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For this addon, I don't think the README is a good place, as there is a dedicated documentation site. https://ember-intl.github.io/ember-intl/versions/v6.1.2/docs/guide/testing shows the syntax for rendering tests. I'll go ahead with closing the issue.

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If anyone wants to avoid having to add this hook to every test, this instance-initializer worked for me to solve tests. Might be slightly slower than choosing specific tests to add the setupIntl(hooks) but way easier and don't need to always remember to do this when writing new tests:

export default {
  initialize: function (application) {
    const env = application.resolveRegistration('config:environment');
    const intl = application.lookup('service:intl');
   
    if(env === 'test'){
      intl.setLocale('en-us');
    }
  }
};

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@kdagnan I recommend customizing setupRenderingTest() instead of an instance initializer. The best way is to call setupIntl() only when needed, to make the dependencies of a test clear and to avoid deprecated patterns such as an implicit service injection.

https://github.com/ember-cli/ember-cli/blob/v5.4.0/blueprints/app/files/tests/helpers/index.ts#L27-L35

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