diff --git a/core/modules/hal/tests/src/Kernel/NormalizeTest.php b/core/modules/hal/tests/src/Kernel/NormalizeTest.php
index cfffb4a..f73e236 100644
--- a/core/modules/hal/tests/src/Kernel/NormalizeTest.php
+++ b/core/modules/hal/tests/src/Kernel/NormalizeTest.php
@@ -5,6 +5,7 @@
 use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Url;
 use Drupal\entity_test\Entity\EntityTest;
+use Drupal\filter\Entity\FilterFormat;
 
 /**
  * Tests HAL normalization edge cases for EntityResource.
@@ -18,6 +19,28 @@ class NormalizeTest extends NormalizerTestBase {
    */
   protected function setUp() {
     parent::setUp();
+    // Create a text format because it is needed for TextItemBase normalization.
+    // @see \Drupal\text\Normalizer\TextItemBaseNormalizer::normalize().
+    FilterFormat::create([
+      'format' => 'my_text_format',
+      'name' => 'My Text Format',
+      'filters' => [
+        'filter_html' => [
+          'module' => 'filter',
+          'status' => TRUE,
+          'weight' => 10,
+          'settings' => [
+            'allowed_html' => '<p>',
+          ],
+        ],
+        'filter_autop' => [
+          'module' => 'filter',
+          'status' => TRUE,
+          'weight' => 10,
+          'settings' => [],
+        ],
+      ],
+    ])->save();
 
     \Drupal::service('router.builder')->rebuild();
   }
@@ -37,7 +60,7 @@ public function testNormalize() {
       'name' => $this->randomMachineName(),
       'field_test_text' => array(
         'value' => $this->randomMachineName(),
-        'format' => 'full_html',
+        'format' => 'my_text_format',
       ),
       'field_test_entity_reference' => array(
         'target_id' => $target_entity_de->id(),
@@ -152,6 +175,7 @@ public function testNormalize() {
         array(
           'value' => $values['field_test_text']['value'],
           'format' => $values['field_test_text']['format'],
+          'processed' => "<p>{$values['field_test_text']['value']}</p>",
         ),
       ),
     );
diff --git a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
index e14335e..5067c48 100644
--- a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
+++ b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Tests\serialization\Kernel;
 
+use Drupal\Component\Serialization\Json;
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\entity_test\Entity\EntityTestMulRev;
 use Drupal\filter\Entity\FilterFormat;
@@ -153,7 +154,7 @@ public function testNormalize() {
         array(
           'value' => $this->values['field_test_text']['value'],
           'format' => $this->values['field_test_text']['format'],
-          'processed' => "<p>{$this->values['field_test_text']['value']}</p>"
+          'processed' => "<p>{$this->values['field_test_text']['value']}</p>",
         ),
       ),
     );
@@ -194,7 +195,7 @@ public function testSerialize() {
     // JsonEncoder. The output of ComplexDataNormalizer::normalize() is tested
     // elsewhere, so we can just assume that it works properly here.
     $normalized = $this->serializer->normalize($this->entity, 'json');
-    $expected = json_encode($normalized);
+    $expected = Json::encode($normalized);
     // Test 'json'.
     $actual = $this->serializer->serialize($this->entity, 'json');
     $this->assertIdentical($actual, $expected, 'Entity serializes to JSON when "json" is requested.');
diff --git a/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php b/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php
index fc02daa..7064a4f 100644
--- a/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php
+++ b/core/modules/text/tests/src/Kernel/TextWithSummaryItemTest.php
@@ -81,6 +81,8 @@ public function testCrudAndUpdate() {
 
     // Change the format, this should update the processed properties.
     $entity->summary_field->format = 'no_filters';
+    $entity->save();
+    $entity = $storage->load($entity->id());
     $this->assertEqual($entity->summary_field->processed, $value);
     $this->assertEqual($entity->summary_field->summary_processed, $summary);