eslint: Add qunit plugin

Author: Turbo87

.eslintrc.js

@@ -13,6 +13,7 @@ module.exports = {
   extends: [
     'eslint:recommended',
     'plugin:ember/recommended',
+    'plugin:qunit/recommended',
     'plugin:qunit-dom/recommended',
     'plugin:unicorn/recommended',
     'plugin:prettier/recommended',
@@ -37,6 +38,9 @@ module.exports = {
     'ember-concurrency/no-perform-without-catch': 'warn',
     'ember-concurrency/require-task-name-suffix': 'error',
 
+    // disabled because of false positives in `assert.rejects()` calls
+    'qunit/require-expect': 'off',
+
     'unicorn/explicit-length-check': ['error', { 'non-zero': 'not-equal' }],
     // disabled because of false positives related to `EmberArray`
     'unicorn/no-array-for-each': 'off',

package.json

@@ -118,6 +118,7 @@
     "eslint-plugin-ember-concurrency": "0.5.1",
     "eslint-plugin-import-helpers": "1.3.1",
     "eslint-plugin-prettier": "4.2.1",
+    "eslint-plugin-qunit": "7.3.3",
     "eslint-plugin-qunit-dom": "0.2.0",
     "eslint-plugin-unicorn": "45.0.0",
     "loader.js": "4.7.0",