.../EntityTestTextItemNormalizerTest.php           | 68 +++++++++++++---------
 1 file changed, 40 insertions(+), 28 deletions(-)

diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestTextItemNormalizerTest.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestTextItemNormalizerTest.php
index b41ad7f..0857a4e 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestTextItemNormalizerTest.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityTest/EntityTestTextItemNormalizerTest.php
@@ -32,6 +32,16 @@ class EntityTestTextItemNormalizerTest extends EntityTestResourceTestBase {
   /**
    * {@inheritdoc}
    */
+  protected function setUpAuthorization($method) {
+    parent::setUpAuthorization($method);
+    if ($method === 'POST') {
+      $this->grantPermissionsToTestedRole(['use text format my_text_format']);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   protected function getExpectedNormalizedEntity() {
     $expected = parent::getExpectedNormalizedEntity();
     $expected['field_test_text'] = [
@@ -49,35 +59,37 @@ protected function getExpectedNormalizedEntity() {
    */
   protected function createEntity() {
     $entity = parent::createEntity();
-    FilterFormat::create([
-      'format' => 'my_text_format',
-      'name' => 'My Text Format',
-      'filters' => [
-        'filter_test_assets' => [
-          'weight' => -1,
-          'status' => TRUE,
-        ],
-        'filter_test_cache_tags' => [
-          'weight' => 0,
-          'status' => TRUE,
-        ],
-        'filter_test_cache_contexts' => [
-          'weight' => 0,
-          'status' => TRUE,
-        ],
-        'filter_test_cache_merge' => [
-          'weight' => 0,
-          'status' => TRUE,
-        ],
-        'filter_test_placeholders' => [
-          'weight' => 1,
-          'status' => TRUE,
-        ],
-        'filter_autop' => [
-          'status' => TRUE,
+    if (!FilterFormat::load('my_text_format')) {
+      FilterFormat::create([
+        'format' => 'my_text_format',
+        'name' => 'My Text Format',
+        'filters' => [
+          'filter_test_assets' => [
+            'weight' => -1,
+            'status' => TRUE,
+          ],
+          'filter_test_cache_tags' => [
+            'weight' => 0,
+            'status' => TRUE,
+          ],
+          'filter_test_cache_contexts' => [
+            'weight' => 0,
+            'status' => TRUE,
+          ],
+          'filter_test_cache_merge' => [
+            'weight' => 0,
+            'status' => TRUE,
+          ],
+          'filter_test_placeholders' => [
+            'weight' => 1,
+            'status' => TRUE,
+          ],
+          'filter_autop' => [
+            'status' => TRUE,
+          ],
         ],
-      ],
-    ])->save();
+      ])->save();
+    }
     $entity->field_test_text = [
       'value' => 'Cádiz is the oldest continuously inhabited city in Spain and a nice place to spend a Sunday with friends.',
       'format' => 'my_text_format',