Rewrite jsx-uses-var tests with template literals

Author: jseminck

tests/lib/rules/jsx-uses-vars.js

@@ -209,18 +209,18 @@ ruleTester.run('no-unused-vars', ruleNoUnusedVars, {
 ruleTester.run('prefer-const', rulePreferConst, {
   valid: [],
   invalid: [{
-    code: [
-      '/* eslint jsx-uses-vars:1 */',
-      'let App = <div />;',
-      '<App />;'
-    ].join('\n'),
+    code: `
+      /* eslint jsx-uses-vars:1 */
+      let App = <div />;
+      <App />;
+    `,
     errors: [{message: '\'App\' is never reassigned. Use \'const\' instead.'}]
   }, {
-    code: [
-      '/* eslint jsx-uses-vars:1 */',
-      'let filters = \'foo\';',
-      '<div>{filters}</div>;'
-    ].join('\n'),
+    code: `
+      /* eslint jsx-uses-vars:1 */
+      let filters = 'foo';
+      <div>{filters}</div>;
+    `,
     errors: [{message: '\'filters\' is never reassigned. Use \'const\' instead.'}]
   }]
 });