diff --git a/core/modules/hal/tests/src/Kernel/NormalizeTest.php b/core/modules/hal/tests/src/Kernel/NormalizeTest.php
index e77d4b464a..d837b79a02 100644
--- a/core/modules/hal/tests/src/Kernel/NormalizeTest.php
+++ b/core/modules/hal/tests/src/Kernel/NormalizeTest.php
@@ -5,7 +5,6 @@
 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.
@@ -19,28 +18,6 @@ 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();
   }
@@ -60,7 +37,7 @@ public function testNormalize() {
       'name' => $this->randomMachineName(),
       'field_test_text' => [
         'value' => $this->randomMachineName(),
-        'format' => 'my_text_format',
+        'format' => 'full_html',
       ],
       'field_test_entity_reference' => [
         'target_id' => $target_entity_de->id(),
@@ -175,7 +152,6 @@ public function testNormalize() {
         [
           'value' => $values['field_test_text']['value'],
           'format' => $values['field_test_text']['format'],
-          'process_result' => "<p>{$values['field_test_text']['value']}</p>",
         ],
       ],
     ];
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php
index d3de35e771..7b65c848b7 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Comment/CommentResourceTestBase.php
@@ -5,7 +5,6 @@
 use Drupal\comment\Entity\Comment;
 use Drupal\comment\Entity\CommentType;
 use Drupal\comment\Tests\CommentTestTrait;
-use Drupal\Core\Cache\Cache;
 use Drupal\entity_test\Entity\EntityTest;
 use Drupal\Tests\rest\Functional\BcTimestampNormalizerUnixTestTrait;
 use Drupal\Tests\rest\Functional\EntityResource\EntityResourceTestBase;
@@ -198,7 +197,6 @@ protected function getExpectedNormalizedEntity() {
         [
           'value' => 'The name "llama" was adopted by European settlers from native Peruvians.',
           'format' => 'plain_text',
-          'process_result' => '<p>The name &quot;llama&quot; was adopted by European settlers from native Peruvians.</p>' . "\n",
         ],
       ],
     ];
@@ -251,20 +249,6 @@ protected function getNormalizedPatchEntity() {
   }
 
   /**
-   * {@inheritdoc}
-   */
-  protected function getExpectedCacheTags() {
-    return Cache::mergeTags(parent::getExpectedCacheTags(), ['config:filter.format.plain_text']);
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function getExpectedCacheContexts() {
-    return Cache::mergeContexts(['languages:language_interface', 'theme'], parent::getExpectedCacheContexts());
-  }
-
-  /**
    * Tests POSTing a comment without critical base fields.
    *
    * testPost() is testing with the most minimal normalization possible: the one
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 6cdcf2bf2d..277c47042b 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -465,7 +465,7 @@ public function testGet() {
     // for the keys with the array order the same (it needs to match with
     // identical comparison).
     $expected = $this->getExpectedNormalizedEntity();
-    static::recursiveKSort($actual);
+    static::recursiveKSort($expected);
     $actual = $this->serializer->decode((string) $response->getBody(), static::$format);
     static::recursiveKSort($actual);
     $this->assertSame($expected, $actual);
@@ -530,7 +530,7 @@ public function testGet() {
       // Config entities are not affected.
       // @see \Drupal\serialization\Normalizer\ConfigEntityNormalizer::normalize()
       $expected = static::castToString($expected);
-      static::recursiveKSort($actual);
+      static::recursiveKSort($expected);
       $actual = $this->serializer->decode((string) $response->getBody(), static::$format);
       static::recursiveKSort($actual);
       $this->assertSame($expected, $actual);
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/Term/TermResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/Term/TermResourceTestBase.php
index 5d5d030c38..cdf446823e 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/Term/TermResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/Term/TermResourceTestBase.php
@@ -2,7 +2,6 @@
 
 namespace Drupal\Tests\rest\Functional\EntityResource\Term;
 
-use Drupal\Core\Cache\Cache;
 use Drupal\taxonomy\Entity\Term;
 use Drupal\taxonomy\Entity\Vocabulary;
 use Drupal\Tests\rest\Functional\BcTimestampNormalizerUnixTestTrait;
@@ -72,7 +71,6 @@ protected function createEntity() {
     // Create a "Llama" taxonomy term.
     $term = Term::create(['vid' => $vocabulary->id()])
       ->setName('Llama')
-      ->setDescription("It is a little known fact that llamas cannot count higher the seven.")
       ->setChangedTime(123456789)
       ->set('path', '/llama');
     $term->save();
@@ -103,9 +101,8 @@ protected function getExpectedNormalizedEntity() {
       ],
       'description' => [
         [
-          'value' => 'It is a little known fact that llamas cannot count higher the seven.',
+          'value' => NULL,
           'format' => NULL,
-          'process_result' => "<p>It is a little known fact that llamas cannot count higher the seven.</p>\n",
         ],
       ],
       'parent' => [],
@@ -175,18 +172,4 @@ protected function getExpectedUnauthorizedAccessMessage($method) {
     }
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function getExpectedCacheTags() {
-    return Cache::mergeTags(parent::getExpectedCacheTags(), ['config:filter.format.plain_text', 'config:filter.settings']);
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function getExpectedCacheContexts() {
-    return Cache::mergeContexts(['url.site'], $this->container->getParameter('renderer.config')['required_cache_contexts']);
-  }
-
 }
diff --git a/core/modules/serialization/tests/modules/field_normalization_test/field_normalization_test.services.yml b/core/modules/serialization/tests/modules/field_normalization_test/field_normalization_test.services.yml
index 51fdd4a5fa..36243e7954 100644
--- a/core/modules/serialization/tests/modules/field_normalization_test/field_normalization_test.services.yml
+++ b/core/modules/serialization/tests/modules/field_normalization_test/field_normalization_test.services.yml
@@ -2,5 +2,5 @@ services:
   serializer.normalizer.silly_fielditem:
     class: Drupal\field_normalization_test\Normalization\TextItemSillyNormalizer
     tags:
-      # The priority must be higher than serializer.normalizer.text_item_base.
-      - { name: normalizer , priority: 30 }
+      # The priority must be higher than serialization.normalizer.field_item.
+      - { name: normalizer , priority: 9 }
diff --git a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
index ac676fc0f0..ebd4e03317 100644
--- a/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
+++ b/core/modules/serialization/tests/src/Kernel/EntitySerializationTest.php
@@ -2,10 +2,8 @@
 
 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;
 use Drupal\Tests\rest\Functional\BcTimestampNormalizerUnixTestTrait;
 
 /**
@@ -65,29 +63,6 @@ protected function setUp() {
     // User create needs sequence table.
     $this->installSchema('system', ['sequences']);
 
-    // 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();
-
     // Create a test user to use as the entity owner.
     $this->user = \Drupal::entityManager()->getStorage('user')->create([
       'name' => 'serialization_test_user',
@@ -97,13 +72,12 @@ protected function setUp() {
     $this->user->save();
 
     // Create a test entity to serialize.
-    $test_text_value = $this->randomMachineName();
     $this->values = [
       'name' => $this->randomMachineName(),
       'user_id' => $this->user->id(),
       'field_test_text' => [
-        'value' => $test_text_value,
-        'format' => 'my_text_format',
+        'value' => $this->randomMachineName(),
+        'format' => 'full_html',
       ],
     ];
     $this->entity = EntityTestMulRev::create($this->values);
@@ -157,7 +131,6 @@ public function testNormalize() {
         [
           'value' => $this->values['field_test_text']['value'],
           'format' => $this->values['field_test_text']['format'],
-          'process_result' => "<p>{$this->values['field_test_text']['value']}</p>",
         ],
       ],
     ];
@@ -198,7 +171,7 @@ 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.');
@@ -225,7 +198,7 @@ public function testSerialize() {
       'revision_id' => '<revision_id><value>' . $this->entity->getRevisionId() . '</value></revision_id>',
       'default_langcode' => '<default_langcode><value>1</value></default_langcode>',
       'non_rev_field' => '<non_rev_field/>',
-      'field_test_text' => '<field_test_text><value>' . $this->values['field_test_text']['value'] . '</value><format>' . $this->values['field_test_text']['format'] . '</format><process_result><![CDATA[<p>' . $this->values['field_test_text']['value'] . '</p>]]></process_result></field_test_text>',
+      'field_test_text' => '<field_test_text><value>' . $this->values['field_test_text']['value'] . '</value><format>' . $this->values['field_test_text']['format'] . '</format></field_test_text>',
     ];
     // Sort it in the same order as normalised.
     $expected = array_merge($normalized, $expected);