Ember CLI Internal Test Helpers

This package, `ember-cli-internal-test-helpers`, provides a collection of utility functions designed exclusively for internal testing within the `ember-cli` project itself. It is not intended for use in Ember applications or addons developed by end-users. The current stable version is `0.9.1`. As an internal utility, it does not follow a public release cadence and its API may change without warning, reflecting the needs of the `ember-cli` core development. Its key differentiator is its specialized focus on testing `ember-cli`'s own architecture, such as blueprint generation and command execution, rather than providing helpers for testing Ember application components or routes.