Generated test(s) referencing destroyApp fail out of the box using Beta

[clekstro]

Several of the test blueprints have already been updated in #15933 in order to support the new testing API approved in RFC 232.

Within a new beta app (3.0.0-beta.4) and generating an instance-initializer using the blueprint merged in #15945, the tests fail out of the box due to the destroyApp helper not being present within the newly generated app:

Error: Could not find module `<app_name>/tests/helpers/destroy-app` 
imported from `<app_name>/tests/unit/instance-initializers/foo-test.js`

Is this helper supposed to be part of a new app, or are the blueprints incorrect?

[rwjblue]

We need to update the blueprint.

Thanks for reporting!