diff --git a/src/Singleton/Sample/Singleton.php b/src/Singleton/Sample/Singleton.php
index 5a22848..14d3774 100644
--- a/src/Singleton/Sample/Singleton.php
+++ b/src/Singleton/Sample/Singleton.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace Sockstack\DesignPattern\Singleton\Sample;
 
 class Singleton
@@ -9,11 +10,10 @@ class Singleton
     //将构造函数私有化
     private function __construct()
     {
-        
     }
 
     //获取实例
-    static public function getInstance()
+    public static function getInstance()
     {
         return empty(static::$instance) ? static::$instance = new static() : static::$instance;
     }
@@ -30,4 +30,3 @@ public function __wakeup()
         trigger_error('对象不能被反序列化');
     }
 }
-
diff --git a/tests/SingletonTest.php b/tests/SingletonTest.php
index 78c4c27..f324788 100644
--- a/tests/SingletonTest.php
+++ b/tests/SingletonTest.php
@@ -3,8 +3,9 @@
  * Created by PhpStorm.
  * User: sockstack
  * Date: 2018/11/6
- * Time: 23:36
+ * Time: 23:36.
  */
+
 namespace Sockstack\DesignPattern\Test;
 
 use PHPUnit\Framework\TestCase;
@@ -18,7 +19,7 @@ class SingletonTest extends TestCase
     public function testSingletonByNew()
     {
         $object = new Singleton();
-        $this->fail("create fail");
+        $this->fail('create fail');
     }
 
     /**
@@ -30,7 +31,7 @@ public function testSingletonClone()
         $object = Singleton::getInstance();
         $clone_objecdt = clone $object;
 
-        $this->fail("clone fail");
+        $this->fail('clone fail');
     }
 
     /**
@@ -42,7 +43,7 @@ public function testSingletonUnserialize()
         $object = Singleton::getInstance();
         $unserialize_object = unserialize(serialize($object));
 
-        $this->fail("unserialize fail");
+        $this->fail('unserialize fail');
     }
 
     public function testSingleton()
@@ -52,4 +53,4 @@ public function testSingleton()
 
         $this->assertEquals($object1, $object2);
     }
-}
\ No newline at end of file
+}