Upgrade PHPUnit version

composer.json

@@ -18,7 +18,7 @@
         "egulias/email-validator": "~1.2",
         "malkusch/bav": "~1.0",
         "mikey179/vfsStream": "^1.5",
-        "phpunit/phpunit": "~4.0",
+        "phpunit/phpunit": "~5.3",
         "symfony/validator": "~2.6.9",
         "zendframework/zend-validator": "~2.3"
     },

tests/unit/Rules/AbstractRuleTest.php

@@ -59,7 +59,7 @@ class AbstractRuleTest extends \PHPUnit_Framework_TestCase
 
         $abstractRuleMock = $this
             ->getMockBuilder('Respect\Validation\Rules\AbstractRule')
-            ->setMethods(['validate'])
+            ->setMethods(['validate', 'reportError'])
             ->getMockForAbstractClass();
 
         $abstractRuleMock