In case of ember-keyboard monorepo setup, package ember-source
does not get hoisted and stay in the test-app/node_modules but at the same time
@ember/test-helpers gets hoisted as well as some another version of ember-source.
By pinning @ember/test-helpers package we avoid this issue.
PR https://github.com/emberjs/ember-test-helpers/pull/1211 (released in v2.8.0) made
ember-sourcea peerDependency of@ember/test-helpers.In case of
ember-keyboardmonorepo setup, packageember-sourcedoes not get hoisted and stay in thetest-app/node_modulesbut at the same time@ember/test-helpersgets hoisted as well as some another version ofember-source.By pinning
@ember/test-helperspackage we avoid this issue.