MAGETWO-63626: Remove all usages of serialize/unserilize

- fixed integration test

Author: vgoncharenko

app/code/Magento/Widget/Helper/Conditions.php

@@ -37,7 +37,7 @@ public function __construct(
      */
     public function encode(array $value)
     {
-        $value = str_replace(['{', '}', '"', '\\'], ['[', ']', '`', '|'], $this->serializer->serialize($value));
+        $value = str_replace(['{', '}', '"', '\\\\'], ['[', ']', '`', '|'], $this->serializer->serialize($value));
         return $value;
     }
 
@@ -49,7 +49,7 @@ public function encode(array $value)
      */
     public function decode($value)
     {
-        $value = str_replace(['[', ']', '`', '|'], ['{', '}', '"', '\\'], $value);
+        $value = str_replace(['[', ']', '`', '|'], ['{', '}', '"', '\\\\'], $value);
         $value = $this->serializer->unserialize($value);
         return $value;
     }

dev/tests/integration/testsuite/Magento/Widget/Model/Widget/InstanceTest.php

@@ -136,8 +136,8 @@ public function testGenerateLayoutUpdateXml(\Magento\Widget\Model\Widget\Instanc
         $this->assertContains('<argument name="name" xsi:type="string">types</argument>', $result);
         $this->assertContains('<argument name="value" xsi:type="string">type_1,type_2</argument>', $result);
         $this->assertContains('<argument name="name" xsi:type="string">conditions_encoded</argument>', $result);
-        $this->assertContains('`Magento||CatalogWidget||Model||Rule||Condition||Combine`', $result);
-        $this->assertContains('`Magento||CatalogWidget||Model||Rule||Condition||Product`', $result);
+        $this->assertContains('`Magento|CatalogWidget|Model|Rule|Condition|Combine`', $result);
+        $this->assertContains('`Magento|CatalogWidget|Model|Rule|Condition|Product`', $result);
     }
 
     /**