Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/phpunit/php-code-coverage/tests/_files/NotExistingCoveredElementTest.php

@@ -0,0 +1,24 @@
+<?php
+class NotExistingCoveredElementTest extends PHPUnit_Framework_TestCase
+{
+    /**
+     * @covers NotExistingClass
+     */
+    public function testOne()
+    {
+    }
+
+    /**
+     * @covers NotExistingClass::notExistingMethod
+     */
+    public function testTwo()
+    {
+    }
+
+    /**
+     * @covers NotExistingClass::<public>
+     */
+    public function testThree()
+    {
+    }
+}