diff -u b/core/modules/update/tests/src/Unit/ProjectCoreCompatibilityTest.php b/core/modules/update/tests/src/Unit/ProjectCoreCompatibilityTest.php
--- b/core/modules/update/tests/src/Unit/ProjectCoreCompatibilityTest.php
+++ b/core/modules/update/tests/src/Unit/ProjectCoreCompatibilityTest.php
@@ -22,7 +22,7 @@
     $project_compatibility->setReleaseMessage($project_data);
     // Ignore the <details> markup, and only assert that the core compatibility
     // constraint, range message and core compatible boolean matches.
-    $purge_compatibility_details = function($release) {
+    $purge_compatibility_details = function ($release) {
       unset($release['core_compatibility_details']);
       return $release;
     };
only in patch2:
unchanged:
--- a/core/modules/update/tests/src/Functional/UpdateContribTest.php
+++ b/core/modules/update/tests/src/Functional/UpdateContribTest.php
@@ -719,7 +719,8 @@ public function securityUpdateAvailabilityProvider() {
   protected function assertCoreCompatibilityMessage($version, $expected_compatibility_range, $expected_release_title) {
     $link = $this->getSession()->getPage()->findLink($version);
     $update_info_element = $link->getParent();
-    $this->assertContains("This module is compatible with Drupal core: $expected_compatibility_range", $update_info_element->getText());
+    $update_compatibility_details_element = $update_info_element->getParent()->find('css', '.project-update__compatibility-details');
+    $this->assertContains("Requires Drupal core: $expected_compatibility_range", $update_compatibility_details_element->getText());
     $update_title_element = $update_info_element->getParent()->find('css', '.project-update__version-title');
     $this->assertSame($expected_release_title, $update_title_element->getText());
   }