Add parens about constructor

spec/api-ipc-spec.js

@@ -37,7 +37,7 @@ describe('ipc module', function () {
       assert.equal(a.bar, 1234)
       assert.equal(a.anonymous.constructor.name, '')
       assert.equal(a.getConstructorName(Object.create(null)), '')
-      assert.equal(a.getConstructorName(new class {}), '')
+      assert.equal(a.getConstructorName(new (class {})), '')
     })
 
     it('should search module from the user app', function () {

spec/fixtures/module/no-prototype.js

@@ -4,7 +4,7 @@ foo.baz = false
 module.exports = {
   foo: foo,
   bar: 1234,
-  anonymous: new class {},
+  anonymous: new (class {}),
   getConstructorName: function (value) {
     return value.constructor.name
   }