Test: Add controller code for valid/invalid cases

These code snippets provide a more concrete context of the rule’s usage in an Ember app

Author: Joao

tests/lib/rules/no-const-outside-module-scope.js

@@ -22,7 +22,17 @@ var ruleTester = new RuleTester({
 ruleTester.run('no-const-outside-module-scope', rule, {
   valid: [
     'const FOOBAR = 5;',
-    'export const FOOBAR = 5;'
+    'export const FOOBAR = 5;',
+    `
+      import Controller from '@ember/controller';
+      const COUNT = 5;
+      export default class extends Controller {
+        get count() {
+          let listCount = this.module.scope ? this.list.length : COUNT;
+          return listCount;
+        }
+      }
+    `
   ],
 
   invalid: [{
@@ -33,5 +43,25 @@ ruleTester.run('no-const-outside-module-scope', rule, {
     code: 'function foobar() { const FOOBAR = 5; return FOOBAR; }',
     output: 'function foobar() { let FOOBAR = 5; return FOOBAR; }',
     errors: [{ message: '`const` should only be used in module scope (not inside functions/blocks).' }]
+  }, {
+    code: `
+      import Controller from '@ember/controller';
+      export default class extends Controller {
+        get isControllerScope() {
+          const { scope } = this
+          return Boolean(scope)
+        }
+      }
+    `,
+    output: `
+      import Controller from '@ember/controller';
+      export default class extends Controller {
+        get isControllerScope() {
+          let { scope } = this
+          return Boolean(scope)
+        }
+      }
+    `,
+    errors: [{ message: '`const` should only be used in module scope (not inside functions/blocks).' }]
   }]
 });