diff --git a/tests/src/Functional/AutomaticUpdatesFunctionalTestBase.php b/tests/src/Functional/AutomaticUpdatesFunctionalTestBase.php
index 9d2608701d56e4da4bd150d9a3abe21ae4128fac..0c3874ce0f2215f63cbfa07230d9ccde9d2f4325 100644
--- a/tests/src/Functional/AutomaticUpdatesFunctionalTestBase.php
+++ b/tests/src/Functional/AutomaticUpdatesFunctionalTestBase.php
@@ -120,12 +120,12 @@ abstract class AutomaticUpdatesFunctionalTestBase extends BrowserTestBase {
   }
 
   /**
-   * Sets the current (running) version of core, as known to the Update module.
+   * Mocks the current (running) version of core, as known to the Update module.
    *
    * @param string $version
-   *   The current version of core.
+   *   The version of core to mock.
    */
-  protected function setCoreVersion(string $version): void {
+  protected function mockActiveCoreVersion(string $version): void {
     $this->config('update_test.settings')
       ->set('system_info.#all.version', $version)
       ->save();
diff --git a/tests/src/Functional/AvailableUpdatesReportTest.php b/tests/src/Functional/AvailableUpdatesReportTest.php
index e11d6c8678fde8be0934770cd1df765ea0b287e1..5b9241285ba9cc52e892e641db86d2a1f18530a9 100644
--- a/tests/src/Functional/AvailableUpdatesReportTest.php
+++ b/tests/src/Functional/AvailableUpdatesReportTest.php
@@ -52,14 +52,14 @@ class AvailableUpdatesReportTest extends AutomaticUpdatesFunctionalTestBase {
     $this->config('automatic_updates.settings')->set('allow_core_minor_updates', TRUE)->save();
     $fixture_directory = __DIR__ . '/../../../package_manager/tests/fixtures/release-history';
     $this->setReleaseMetadata("$fixture_directory/drupal.9.8.1-security.xml");
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $assert->pageTextContains('Security update required! Update now');
     $assert->elementAttributeContains('named', ['link', 'Update now'], 'href', $form_url);
     $this->assertVersionLink('9.8.1', $form_url);
 
     $this->setReleaseMetadata("$fixture_directory/drupal.9.8.2-older-sec-release.xml");
-    $this->setCoreVersion('9.7.0');
+    $this->mockActiveCoreVersion('9.7.0');
     $this->checkForUpdates();
     $assert->pageTextContains('Security update required! Update now');
 
diff --git a/tests/src/Functional/StatusCheckTest.php b/tests/src/Functional/StatusCheckTest.php
index b5bb7b9019342f3ffc5f5710a480e25358d3314d..d915ae10e075769bb46ad0de329009f42f4bd757 100644
--- a/tests/src/Functional/StatusCheckTest.php
+++ b/tests/src/Functional/StatusCheckTest.php
@@ -68,7 +68,7 @@ class StatusCheckTest extends AutomaticUpdatesFunctionalTestBase {
   protected function setUp(): void {
     parent::setUp();
     $this->setReleaseMetadata(__DIR__ . '/../../../package_manager/tests/fixtures/release-history/drupal.9.8.1-security.xml');
-    $this->setCoreVersion('9.8.1');
+    $this->mockActiveCoreVersion('9.8.1');
 
     $this->reportViewerUser = $this->createUser([
       'administer site configuration',
@@ -479,7 +479,7 @@ class StatusCheckTest extends AutomaticUpdatesFunctionalTestBase {
 
     // The current release is 9.8.1 (see ::setUp()), so ensure we're on an older
     // version.
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
 
     // Flag a validation error, which will be displayed in the messages area.
     $results = [$this->createValidationResult(SystemManager::REQUIREMENT_ERROR)];
diff --git a/tests/src/Functional/UpdateLockTest.php b/tests/src/Functional/UpdateLockTest.php
index 2fd681da2754ecb83015bc776d290a544987874b..165746ad62d6b07dbc83fbf307917883370784cf 100644
--- a/tests/src/Functional/UpdateLockTest.php
+++ b/tests/src/Functional/UpdateLockTest.php
@@ -49,7 +49,7 @@ class UpdateLockTest extends AutomaticUpdatesFunctionalTestBase {
       ->setReadyToCommit();
     $page = $this->getSession()->getPage();
     $assert_session = $this->assertSession();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $permissions = ['administer software updates'];
     $user_1 = $this->createUser($permissions);
diff --git a/tests/src/Functional/UpdaterFormNoRecommendedReleaseMessageTest.php b/tests/src/Functional/UpdaterFormNoRecommendedReleaseMessageTest.php
index d5990456919a028128e4fa02c09c52442dbca982..f5be5aa0352868d614a23d262db9bebc75c2080c 100644
--- a/tests/src/Functional/UpdaterFormNoRecommendedReleaseMessageTest.php
+++ b/tests/src/Functional/UpdaterFormNoRecommendedReleaseMessageTest.php
@@ -85,7 +85,7 @@ class UpdaterFormNoRecommendedReleaseMessageTest extends AutomaticUpdatesFunctio
    */
   public function testMessages(string $release_metadata, string $installed_version, bool $updates_available, string $expected_message_type): void {
     $this->setReleaseMetadata($release_metadata);
-    $this->setCoreVersion($installed_version);
+    $this->mockActiveCoreVersion($installed_version);
     $this->checkForUpdates();
     $this->drupalGet('/admin/reports/updates/update');
 
diff --git a/tests/src/Functional/UpdaterFormTest.php b/tests/src/Functional/UpdaterFormTest.php
index 0e6330dd32ae3ed889def931daae62f141d8661f..f8350d13b143e08cd266bfc17aa20c397a325039 100644
--- a/tests/src/Functional/UpdaterFormTest.php
+++ b/tests/src/Functional/UpdaterFormTest.php
@@ -108,7 +108,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
    * @dataProvider providerUpdateFormReferringUrl
    */
   public function testFormNotDisplayedIfAlreadyCurrent(string $update_form_url): void {
-    $this->setCoreVersion('9.8.1');
+    $this->mockActiveCoreVersion('9.8.1');
     $this->checkForUpdates();
 
     $this->drupalGet($update_form_url);
@@ -141,7 +141,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
 
     $page = $this->getSession()->getPage();
     $this->drupalPlaceBlock('local_tasks_block', ['primary' => TRUE]);
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
 
     // Navigate to the automatic updates form.
@@ -165,7 +165,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
 
     // Check the form when there is an update in the next minor only.
     $this->config('automatic_updates.settings')->set('allow_core_minor_updates', TRUE)->save();
-    $this->setCoreVersion('9.7.0');
+    $this->mockActiveCoreVersion('9.7.0');
     $page->clickLink('Check manually');
     $this->checkForMetaRefresh();
     $this->checkReleaseTable('#edit-next-minor-1', '.update-update-recommended', '9.8.1', TRUE, 'Latest version of Drupal 9.8 (next minor) (Release notes):');
@@ -194,7 +194,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $this->assertReleaseNotesLink(9, 8, '#edit-next-minor-1');
     $assert_minor_update_help();
 
-    $this->setCoreVersion('9.7.1');
+    $this->mockActiveCoreVersion('9.7.1');
     $page->clickLink('Check manually');
     $this->checkForMetaRefresh();
     $assert_session->pageTextContainsOnce('Currently installed: 9.7.1 (Update available)');
@@ -207,7 +207,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     // are visible.
     $this->config('automatic_updates.settings')->set('allow_core_minor_updates', TRUE)->save();
     $this->setReleaseMetadata(__DIR__ . '/../../../package_manager/tests/fixtures/release-history/drupal.10.0.0.xml');
-    $this->setCoreVersion('9.5.0');
+    $this->mockActiveCoreVersion('9.5.0');
     $page->clickLink('Check manually');
     $this->checkForMetaRefresh();
     $assert_session->pageTextNotContains('10.0.0');
@@ -221,7 +221,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
 
     // Check that if installed version is unsupported and minor updates are
     // enabled then updates in the next minors are visible.
-    $this->setCoreVersion('9.4.0');
+    $this->mockActiveCoreVersion('9.4.0');
     $page->clickLink('Check manually');
     $this->checkForMetaRefresh();
     $assert_session->pageTextNotContains('10.0.0');
@@ -251,7 +251,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
    */
   public function testStatusCheckFailureWhenNoUpdateExists() {
     $assert_session = $this->assertSession();
-    $this->setCoreVersion('9.8.1');
+    $this->mockActiveCoreVersion('9.8.1');
     $message = "You've not experienced Shakespeare until you have read him in the original Klingon.";
     $result = ValidationResult::createError([$message]);
     TestSubscriber1::setTestResult([$result], StatusCheckEvent::class);
@@ -266,7 +266,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
    */
   public function testNextMinorPreRelease(): void {
     $this->setReleaseMetadata(__DIR__ . '/../../../package_manager/tests/fixtures/release-history/drupal.9.8.0-beta1.xml');
-    $this->setCoreVersion('9.7.0');
+    $this->mockActiveCoreVersion('9.7.0');
     $this->config('automatic_updates.settings')
       ->set('allow_core_minor_updates', TRUE)
       ->save();
@@ -326,7 +326,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $session->reload();
     $assert_session->pageTextContainsOnce($cached_message);
 
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
 
     // Set up a new fake error. Use an error with multiple messages so we can
@@ -397,7 +397,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $session = $this->getSession();
     $assert_session = $this->assertSession();
     $page = $session->getPage();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
 
     $this->drupalGet('/admin/modules/automatic-update');
@@ -436,7 +436,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
    * @dataProvider providerUpdateFormReferringUrl
    */
   public function testMinorVersionUpdateNotSupported(string $update_form_url): void {
-    $this->setCoreVersion('9.7.1');
+    $this->mockActiveCoreVersion('9.7.1');
     $this->checkForUpdates();
 
     $this->drupalGet($update_form_url);
@@ -460,7 +460,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
 
     $assert_session = $this->assertSession();
     $page = $this->getSession()->getPage();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
 
     $this->drupalGet('/admin/modules/update');
@@ -585,7 +585,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     (new StageFixtureManipulator())
       ->setCorePackageVersion('9.8.1')
       ->setReadyToCommit();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $this->container->get('theme_installer')->install(['automatic_updates_theme_with_updates']);
     $cached_message = $this->setAndAssertCachedMessage();
@@ -706,7 +706,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
       ->setCorePackageVersion('9.8.1')
       ->setReadyToCommit();
     $assert_session = $this->assertSession();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $state = $this->container->get('state');
     $state->set('system.maintenance_mode', $maintenance_mode_on);
@@ -769,7 +769,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
       ->setCorePackageVersion('9.8.1')
       ->setReadyToCommit();
     $assert_session = $this->assertSession();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $page = $this->getSession()->getPage();
     // Navigate to the automatic updates form.
@@ -849,7 +849,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
       ->setCorePackageVersion('9.8.1')
       ->setReadyToCommit();
     $assert_session = $this->assertSession();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $state = $this->container->get('state');
     $state->set('system.maintenance_mode', $maintenance_mode_on);
@@ -874,7 +874,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     (new StageFixtureManipulator())
       ->setCorePackageVersion('9.8.1')
       ->setReadyToCommit();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
 
     $page = $this->getSession()->getPage();
@@ -911,7 +911,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $session = $this->getSession();
     $assert_session = $this->assertSession();
     $page = $session->getPage();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
 
     $this->drupalGet('/admin/modules/update');
@@ -938,7 +938,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
     $session = $this->getSession();
     $assert_session = $this->assertSession();
     $page = $session->getPage();
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $this->drupalGet('/admin/modules/automatic-update');
     $page->pressButton('Update to 9.8.1');
@@ -968,7 +968,7 @@ class UpdaterFormTest extends AutomaticUpdatesFunctionalTestBase {
   public function testContinueOnWarning(): void {
     $session = $this->getSession();
 
-    $this->setCoreVersion('9.8.0');
+    $this->mockActiveCoreVersion('9.8.0');
     $this->checkForUpdates();
     $this->drupalGet('/admin/modules/automatic-update');
     $session->getPage()->pressButton('Update to 9.8.1');