.../EntityResource/EntityTest/EntityTestDatetimeTest.php       | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/core/modules/datetime/tests/src/Functional/EntityResource/EntityTest/EntityTestDatetimeTest.php b/core/modules/datetime/tests/src/Functional/EntityResource/EntityTest/EntityTestDatetimeTest.php
index 4c92213..f5efce5 100644
--- a/core/modules/datetime/tests/src/Functional/EntityResource/EntityTest/EntityTestDatetimeTest.php
+++ b/core/modules/datetime/tests/src/Functional/EntityResource/EntityTest/EntityTestDatetimeTest.php
@@ -179,4 +179,14 @@ protected function assertNormalizationEdgeCases($method, Url $url, array $reques
     }
   }
 
+  /**
+   * {@inheritdoc}
+   *
+   * @group legacy
+   * @expectedDeprecation The provided datetime string format (Y-m-d\TH:i:s) is deprecated and will be removed before Drupal 9.0.0. Use the RFC3339 format instead (Y-m-d\TH:i:sP).
+   */
+  public function testPatch() {
+    return parent::testPatch();
+  }
+
 }