test: fix test, we still use php5

Author: adhocore

tests/HigherOrderMessageTest.php

@@ -14,6 +14,16 @@
 use Ahc\Underscore\HigherOrderMessage;
 use PHPUnit\Framework\TestCase as TestCase;
 
+class HOM
+{
+    public $b = 'B';
+
+    public function a()
+    {
+        return 'A';
+    }
+}
+
 /**
  * Auto generated by `phint test`.
  */
@@ -34,23 +44,12 @@ public function setUp()
         parent::setUp();
 
         $this->hom1 = new HigherOrderMessage(
-            underscore([
-                ['a' => 1, 'b' => 2],
-            ]),
+            underscore([['a' => 1, 'b' => 2]]),
             'map'
         );
 
         $this->hom2 = new HigherOrderMessage(
-            underscore([
-                new class {
-                    public $b = 'B';
-
-                    public function a()
-                    {
-                        return 'A';
-                    }
-                },
-            ]),
+            underscore([new HOM]),
             'map'
         );
     }