Issue #2159737 by damiankloip: Unit test the Drupal\serialization\Normalizer\NormalizerBase class.

core/modules/serialization/lib/Drupal/serialization/Normalizer/NormalizerBase.php

@@ -7,7 +7,6 @@
 
 namespace Drupal\serialization\Normalizer;
 
-use Symfony\Component\Serializer\Exception\RuntimeException;
 use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
 use Symfony\Component\Serializer\Normalizer\SerializerAwareNormalizer;
 
@@ -27,7 +26,7 @@ abstract class NormalizerBase extends SerializerAwareNormalizer implements Norma
    * Implements \Symfony\Component\Serializer\Normalizer\NormalizerInterface::supportsNormalization().
    */
   public function supportsNormalization($data, $format = NULL) {
-    return is_object($data) && ($data instanceof $this->supportedInterfaceOrClass);
+    return is_object($data) && (isset($this->supportedInterfaceOrClass) && ($data instanceof $this->supportedInterfaceOrClass));
   }
 
 }

core/modules/serialization/tests/Drupal/serialization/Tests/Normalizer/NormalizerBaseTest.php

@@ -0,0 +1,95 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\serialization\Tests\Normalizer\NormalizerBaseTest.
+ */
+
+namespace Drupal\serialization\Tests\Normalizer;
+
+use Drupal\Tests\UnitTestCase;
+use Drupal\serialization\Normalizer\NormalizerBase;
+
+/**
+ * Tests the NormalizerBase class.
+ *
+ * @see \Drupal\serialization\Normalizer\NormalizerBase
+ *
+ * @group Serialization
+ */
+class NormalizerBaseTest extends UnitTestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getInfo() {
+    return array(
+      'name' => 'NormalizerBase',
+      'description' => 'Tests the abstract NormalizerBase class.',
+      'group' => 'Serialization',
+    );
+  }
+
+  /**
+   * Tests the supportsNormalization method.
+   *
+   * @dataProvider providerTestSupportsNormalization
+   *
+   * @param bool $expected_return
+   *   The expected boolean return value from supportNormalization.
+   * @param mixed $data
+   *   The data passed to supportsNormalization.
+   * @param string $supported_interface_or_class
+   *   (optional) the supported interface or class to set on the normalizer.
+   */
+  public function testSupportsNormalization($expected_return, $data, $supported_interface_or_class = NULL) {
+    $normalizer_base = $this->getMockForAbstractClass('Drupal\serialization\Tests\Normalizer\TestNormalizerBase');
+
+    if (isset($supported_interface_or_class)) {
+      $normalizer_base->setSupportedInterfaceOrClass($supported_interface_or_class);
+    }
+
+    $this->assertSame($expected_return, $normalizer_base->supportsNormalization($data));
+  }
+
+  /**
+   * Data provider for testSupportsNormalization.
+   *
+   * @return array
+   *   An array of provider data for testSupportsNormalization.
+   */
+  public function providerTestSupportsNormalization() {
+    return array(
+      // Something that is not an object should return FALSE immediately.
+      array(FALSE, array()),
+      // An object with no class set should return FALSE.
+      array(FALSE, new \stdClass()),
+      // Set a supported Class.
+      array(TRUE, new \stdClass(), 'stdClass'),
+      // Set a supported interface.
+      array(TRUE, new \RecursiveArrayIterator(), 'RecursiveIterator'),
+      // Set a different class.
+      array(FALSE, new \stdClass(), 'ArrayIterator'),
+      // Set a different interface.
+      array(FALSE, new \stdClass(), 'RecursiveIterator'),
+    );
+  }
+
+}
+
+/**
+ * Test class for NormalizerBase.
+ */
+abstract class TestNormalizerBase extends NormalizerBase {
+
+  /**
+   * Sets the protected supportedInterfaceOrClass property.
+   *
+   * @param string $supported_interface_or_class
+   *   The class name to set.
+   */
+  public function setSupportedInterfaceOrClass($supported_interface_or_class) {
+    $this->supportedInterfaceOrClass = $supported_interface_or_class;
+  }
+
+}