diff --git a/core/modules/simpletest/tests/src/Unit/SimpletestUiPrinterTest.php b/core/modules/simpletest/tests/src/Unit/SimpletestUiPrinterTest.php
index 03aeda66f0..1c311b8785 100644
--- a/core/modules/simpletest/tests/src/Unit/SimpletestUiPrinterTest.php
+++ b/core/modules/simpletest/tests/src/Unit/SimpletestUiPrinterTest.php
@@ -6,6 +6,8 @@
 use Drupal\Tests\UnitTestCase;
 
 /**
+ * @coversDefaultClass \Drupal\Tests\Listeners\SimpletestUiPrinter
+ *
  * @group simpletest
  */
 class SimpletestUiPrinterTest extends UnitTestCase {
@@ -21,6 +23,8 @@ public function provideBuffer() {
   }
 
   /**
+   * @covers ::write
+   *
    * @dataProvider provideBuffer
    */
   public function testWrite($expected, $buffer) {
diff --git a/core/tests/Drupal/Tests/Listeners/Legacy/HtmlOutputPrinter.php b/core/tests/Drupal/Tests/Listeners/Legacy/HtmlOutputPrinter.php
index 53bb0e2347..7a332bc2de 100644
--- a/core/tests/Drupal/Tests/Listeners/Legacy/HtmlOutputPrinter.php
+++ b/core/tests/Drupal/Tests/Listeners/Legacy/HtmlOutputPrinter.php
@@ -15,7 +15,7 @@ class HtmlOutputPrinter extends \PHPUnit_TextUI_ResultPrinter {
   /**
    * {@inheritdoc}
    */
-  public function __construct($out = null, $verbose = false, $colors = self::COLOR_DEFAULT, $debug = false, $numberOfColumns = 80) {
+  public function __construct($out = NULL, $verbose = FALSE, $colors = self::COLOR_DEFAULT, $debug = FALSE, $numberOfColumns = 80) {
     parent::__construct($out, $verbose, $colors, $debug, $numberOfColumns);
 
     $this->setUpHtmlOutput();