.../tests/src/Functional/EntityResource/EntityResourceTestBase.php    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 735ba83..e4c7ce8 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -928,7 +928,7 @@ public function testPost() {
         if ($created_entity->hasField($field_name)) {
           // Subset, not same, because we can e.g. send just the target_id for the
           // bundle in a POST request; the response will include more properties.
-          $this->assertArraySubset(static::castToString($field_normalization), $created_entity_normalization[$field_name], TRUE);
+          $this->assertArraySubset(static::castToString($field_normalization), static::castToString($created_entity_normalization[$field_name]), TRUE);
         }
       }
     }
@@ -1188,7 +1188,7 @@ public function testPatch() {
       if ($updated_entity->hasField($field_name)) {
         // Subset, not same, because we can e.g. send just the target_id for the
         // bundle in a PATCH request; the response will include more properties.
-        $this->assertArraySubset(static::castToString($field_normalization), $updated_entity_normalization[$field_name], TRUE);
+        $this->assertArraySubset(static::castToString($field_normalization), static::castToString($updated_entity_normalization[$field_name]), TRUE);
       }
     }
     // Ensure that fields do not get deleted if they're not present in the PATCH