Update core 8.3.0

web/core/modules/simpletest/tests/fixtures/simpletest_phpunit_browsertest.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Drupal\Tests\simpletest\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * A PHPUnit-based browser test that will be run from Simpletest.
+ *
+ * To avoid accidentally running it is not in a normal PSR-4 directory.
+ *
+ * @group simpletest
+ */
+class SimpletestPhpunitBrowserTest extends BrowserTestBase {
+
+  /**
+   * Dummy test that logs the visited front page for HTML output.
+   */
+  public function testOutput() {
+    $this->drupalGet('<front>');
+    $this->assertSession()->responseContains('<h2>TEST escaping</h2>');
+  }
+
+}