MAGETWO-64898: [GitHub][PR] Remove Zend_Json from Customer module magento#8617

 - fixed typo in unit test
 - added method description

Author: Oleksii Korshenko

app/code/Magento/Customer/Block/Account/AuthenticationPopup.php

@@ -61,6 +61,10 @@ public function getConfig()
     }
 
     /**
+     * Returns popup config in JSON format.
+     *
+     * Added in scope of https://github.com/magento/magento2/pull/8617
+     *
      * @return bool|string
      */
     public function getSerializedConfig()

app/code/Magento/Customer/Test/Unit/Block/Account/AuthenticationPopupTest.php

@@ -32,7 +32,7 @@ class AuthenticationPopupTest extends \PHPUnit_Framework_TestCase
     private $urlBuilderMock;
 
     /** @var \Magento\Framework\Serialize\Serializer\Json|\PHPUnit_Framework_MockObject_MockObject */
-    private $serilizerMock;
+    private $serializerMock;
 
     protected function setUp()
     {
@@ -75,13 +75,13 @@ function ($string) {
             ->method('getEscaper')
             ->willReturn($escaperMock);
 
-        $this->serilizerMock = $this->getMockBuilder(\Magento\Framework\Serialize\Serializer\Json::class)
+        $this->serializerMock = $this->getMockBuilder(\Magento\Framework\Serialize\Serializer\Json::class)
             ->getMock();
 
         $this->model = new AuthenticationPopup(
             $this->contextMock,
             [],
-            $this->serilizerMock
+            $this->serializerMock
         );
     }
 
@@ -221,7 +221,7 @@ public function testGetSerializedConfig($isAutocomplete, $baseUrl, $registerUrl,
                     ['customer/account/forgotpassword', [], $forgotUrl],
                 ]
             );
-        $this->serilizerMock->expects($this->any())->method('serialize')
+        $this->serializerMock->expects($this->any())->method('serialize')
             ->willReturn(
                 json_encode($this->model->getConfig())
             );