MC-41153: Fix broken builds on 2.3.7-develop

Author: dvoskoboinikov

app/code/Magento/Customer/Test/Unit/Model/Address/Validator/CustomerTest.php

@@ -29,7 +29,7 @@ class CustomerTest extends TestCase
     /**
      * @inheritDoc
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->addressFactoryMock = $this->createMock(AddressFactory::class);
         $objectManager = new ObjectManager($this);

app/code/Magento/Customer/Test/Unit/Model/Webapi/ParamOverriderCustomerGroupIdTest.php

@@ -38,7 +38,7 @@ class ParamOverriderCustomerGroupIdTest extends TestCase
     /**
      * @inheritDoc
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->userContextMock = $this->createMock(UserContextInterface::class);
         $this->customerRepositoryMock = $this->createMock(CustomerRepositoryInterface::class);

app/code/Magento/Customer/Test/Unit/Model/Webapi/ParamOverriderCustomerStoreIdTest.php

@@ -38,7 +38,7 @@ class ParamOverriderCustomerStoreIdTest extends TestCase
     /**
      * @inheritDoc
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->userContextMock = $this->createMock(UserContextInterface::class);
         $this->customerRepositoryMock = $this->createMock(CustomerRepositoryInterface::class);

app/code/Magento/Customer/Test/Unit/Model/Webapi/ParamOverriderCustomerWebsiteIdTest.php

@@ -38,7 +38,7 @@ class ParamOverriderCustomerWebsiteIdTest extends TestCase
     /**
      * @inheritDoc
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->userContextMock = $this->createMock(UserContextInterface::class);
         $this->customerRepositoryMock = $this->createMock(CustomerRepositoryInterface::class);

dev/tests/functional/tests/app/Magento/CatalogUrlRewrite/Test/TestCase/CreateDuplicateUrlProductEntity.php

@@ -108,7 +108,7 @@ public function testCreate(
      *
      * @return void
      */
-    public function tearDown()
+    public function tearDown(): void
     {
         $this->objectManager->create(
             \Magento\Config\Test\TestStep\SetupConfigurationStep::class,

dev/tests/functional/tests/app/Magento/Customer/Test/TestCase/CreateExistingCustomerFrontendEntity.php

@@ -94,7 +94,7 @@ public function testCreateExistingCustomer(Customer $customer)
      *
      * @return void
      */
-    public function tearDown()
+    public function tearDown(): void
     {
         $this->objectManager->create(\Magento\Customer\Test\TestStep\LogoutCustomerOnFrontendStep::class)->run();
     }

dev/tests/integration/testsuite/Magento/Framework/View/LayoutTestWithExceptions.php

@@ -14,7 +14,7 @@ class LayoutTestWithExceptions extends \PHPUnit\Framework\TestCase
      */
     protected $layout;
 
-    public function setUp()
+    public function setUp(): void
     {
         $objectManager = \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
         $layoutFactory = $objectManager->get(\Magento\Framework\View\LayoutFactory::class);