diff --git a/tests/DbTestCase.php b/tests/DbTestCase.php
index 3d528093ace..aeb169ddf01 100644
--- a/tests/DbTestCase.php
+++ b/tests/DbTestCase.php
@@ -347,9 +347,9 @@ protected function initAssetDefinition(
                 'is_active'   => true,
                 'capacities'  => $capacities,
                 'profiles'    => $profiles,
-                'fields_display' => '[]',
+                'fields_display' => [],
             ],
-            skip_fields: ['capacities', 'profiles'] // JSON encoded fields cannot be automatically checked
+            skip_fields: ['capacities', 'profiles', 'fields_display'] // JSON encoded fields cannot be automatically checked
         );
         $this->array($this->callPrivateMethod($definition, 'getDecodedCapacitiesField'))->isEqualTo($capacities);
         $this->array($this->callPrivateMethod($definition, 'getDecodedProfilesField'))->isEqualTo($profiles);