diff --git a/tests/src/Functional/BlockTest.php b/tests/src/Functional/BlockTest.php
index e7786fa..7379de9 100644
--- a/tests/src/Functional/BlockTest.php
+++ b/tests/src/Functional/BlockTest.php
@@ -156,7 +156,7 @@ class BlockTest extends ResourceTestBase {
   protected function getExpectedUnauthorizedAccessMessage($method) {
     switch ($method) {
       case 'GET':
-        return '';
+        return "The block visibility condition 'user_role' denied access.";
 
       default:
         return parent::getExpectedUnauthorizedAccessMessage($method);
diff --git a/tests/src/Functional/ConfigTestTest.php b/tests/src/Functional/ConfigTestTest.php
index 64fd91f..e6d873d 100644
--- a/tests/src/Functional/ConfigTestTest.php
+++ b/tests/src/Functional/ConfigTestTest.php
@@ -41,6 +41,19 @@ class ConfigTestTest extends ResourceTestBase {
     $this->grantPermissionsToTestedRole(['view config_test']);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedUnauthorizedAccessMessage($method) {
+    switch ($method) {
+      case 'GET':
+        return "The 'view config_test' permission is required.";
+
+      default:
+        return parent::getExpectedUnauthorizedAccessMessage($method);
+    }
+  }
+
   /**
    * {@inheritdoc}
    */
diff --git a/tests/src/Functional/ResourceTestBase.php b/tests/src/Functional/ResourceTestBase.php
index c04e32f..9dbcd83 100644
--- a/tests/src/Functional/ResourceTestBase.php
+++ b/tests/src/Functional/ResourceTestBase.php
@@ -910,25 +910,8 @@ abstract class ResourceTestBase extends BrowserTestBase {
     if (!static::$anonymousUsersCanViewLabels) {
       $expected_403_cacheability = $this->getExpectedUnauthorizedAccessCacheability();
       $reason = $this->getExpectedUnauthorizedAccessMessage('GET');
-      // @todo Remove $expected + assertResourceResponse() in favor of the commented line below once https://www.drupal.org/project/jsonapi/issues/2943176 lands.
-      $expected_document = [
-        'jsonapi' => static::$jsonApiMember,
-        'errors' => [
-          [
-            'title' => 'Forbidden',
-            'status' => 403,
-            'detail' => "The current user is not allowed to GET the selected resource." . (strlen($reason) ? ' ' . $reason : ''),
-            'links' => [
-              'info' => ['href' => HttpExceptionNormalizer::getInfoUrl(403)],
-              'via' => ['href' => $url->setAbsolute()->toString()],
-            ],
-            'source' => [
-              'pointer' => '/data',
-            ],
-          ],
-        ],
-      ];
-      $this->assertResourceResponse(403, $expected_document, $response, $expected_403_cacheability->getCacheTags(), $expected_403_cacheability->getCacheContexts(), FALSE, 'MISS');
+      $message = trim("The current user is not allowed to GET the selected resource. $reason");
+      $this->assertResourceErrorResponse(403, $message, $url, $response, '/data', $expected_403_cacheability->getCacheTags(), $expected_403_cacheability->getCacheContexts(), FALSE, 'MISS');
       $this->assertArrayNotHasKey('Link', $response->getHeaders());
     }
     else {
diff --git a/tests/src/Functional/ShortcutSetTest.php b/tests/src/Functional/ShortcutSetTest.php
index 6322abd..0ab41a3 100644
--- a/tests/src/Functional/ShortcutSetTest.php
+++ b/tests/src/Functional/ShortcutSetTest.php
@@ -54,6 +54,19 @@ class ShortcutSetTest extends ResourceTestBase {
     }
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function getExpectedUnauthorizedAccessMessage($method) {
+    switch ($method) {
+      case 'GET':
+        return "The 'access shortcuts' permission is required.";
+
+      default:
+        return parent::getExpectedUnauthorizedAccessMessage($method);
+    }
+  }
+
   /**
    * {@inheritdoc}
    */