diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 5e33c14..eaea09b 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -700,10 +700,10 @@ public function testPost() {
     $error = [
       'message' => "Validation of the $entity_type_id entity failed",
       'errors' => [
-        $label_field => "$label_field_capitalized: this field cannot hold more than 1 values.",
+        $label_field => ["$label_field_capitalized: this field cannot hold more than 1 values."],
       ],
     ];
-    $this->assertResourceErrorResponse(422, json_encode($error), $response);
+    $this->assertResourceResponse(422, json_encode($error), $response);
 
 
     $request_options[RequestOptions::BODY] = $parseable_invalid_request_body_2;
@@ -714,10 +714,10 @@ public function testPost() {
     $error = [
       'message' => "Validation of the $entity_type_id entity failed",
       'errors' => [
-        'uuid.0.value' => 'UUID: may not be longer than 128 characters.',
+        'uuid.0.value' => ['UUID: may not be longer than 128 characters.'],
       ],
     ];
-    $this->assertResourceErrorResponse(422, json_encode($error), $response);
+    $this->assertResourceResponse(422, json_encode($error), $response);
 
 
     $request_options[RequestOptions::BODY] = $parseable_invalid_request_body_3;
@@ -901,10 +901,10 @@ public function testPatch() {
     $error = [
       'message' => "Validation of the {$this->entity->getEntityTypeId()} entity failed",
       'errors' => [
-        $label_field => "$label_field_capitalized: this field cannot hold more than 1 values.",
+        $label_field => ["$label_field_capitalized: this field cannot hold more than 1 values."],
       ],
     ];
-    $this->assertResourceErrorResponse(422, json_encode($error), $response);
+    $this->assertResourceResponse(422, json_encode($error), $response);
 
 
     $request_options[RequestOptions::BODY] = $parseable_invalid_request_body_2;