--- /dev/null
+<?php
+
+namespace Drupal\Tests\serialization\Unit\Normalizer;
+
+use Drupal\serialization\Normalizer\ConfigEntityNormalizer;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\serialization\Normalizer\ConfigEntityNormalizer
+ * @group serialization
+ */
+class ConfigEntityNormalizerTest extends UnitTestCase {
+
+ /**
+ * Tests the normalize() method.
+ *
+ * @covers ::normalize
+ */
+ public function testNormalize() {
+ $test_export_properties = ['test' => 'test'];
+
+ $entity_manager = $this->getMock('Drupal\Core\Entity\EntityManagerInterface');
+ $normalizer = new ConfigEntityNormalizer($entity_manager);
+
+ $config_entity = $this->getMock('Drupal\Core\Config\Entity\ConfigEntityInterface');
+ $config_entity->expects($this->once())
+ ->method('toArray')
+ ->will($this->returnValue($test_export_properties));
+
+ $this->assertSame($test_export_properties, $normalizer->normalize($config_entity));
+ }
+
+}