diff -u b/core/modules/user/tests/src/Unit/SharedTempStoreTest.php b/core/modules/user/tests/src/Unit/SharedTempStoreTest.php
--- b/core/modules/user/tests/src/Unit/SharedTempStoreTest.php
+++ b/core/modules/user/tests/src/Unit/SharedTempStoreTest.php
@@ -78,10 +78,10 @@
     $this->lock = $this->createMock('Drupal\Core\Lock\LockBackendInterface');
     $this->requestStack = new RequestStack();
     $request = Request::createFromGlobals();
-    $session = $this->getMock(SessionInterface::class);
+    $session = $this->createMock(SessionInterface::class);
     $request->setSession($session);
     $this->requestStack->push($request);
-    $current_user = $this->getMock(AccountProxyInterface::class);
+    $current_user = $this->createMock(AccountProxyInterface::class);
 
     $this->tempStore = new SharedTempStore($this->keyValue, $this->lock, $this->owner, $this->requestStack, $current_user, 604800);
 
diff -u b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
--- b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
+++ b/core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php
@@ -78,10 +78,10 @@
     $this->lock = $this->createMock('Drupal\Core\Lock\LockBackendInterface');
     $this->requestStack = new RequestStack();
     $request = Request::createFromGlobals();
-    $session = $this->getMock(SessionInterface::class);
+    $session = $this->createMock(SessionInterface::class);
     $request->setSession($session);
     $this->requestStack->push($request);
-    $current_user = $this->getMock(AccountProxyInterface::class);
+    $current_user = $this->createMock(AccountProxyInterface::class);
 
     $this->tempStore = new SharedTempStore($this->keyValue, $this->lock, $this->owner, $this->requestStack, $current_user, 604800);