MC-16926: [Backport for 2.2.x] Use Escaper methods

- clean up code

Author: anthoula

app/code/Magento/Analytics/Test/Unit/Block/Adminhtml/System/Config/SubscriptionStatusLabelTest.php

@@ -57,10 +57,11 @@ protected function setUp()
 
         $objectManager = new ObjectManager($this);
         $escaper = $objectManager->getObject(\Magento\Framework\Escaper::class);
-        $reflection = new \ReflectionClass($this->abstractElementMock);
-        $reflection_property = $reflection->getProperty('_escaper');
-        $reflection_property->setAccessible(true);
-        $reflection_property->setValue($this->abstractElementMock, $escaper);
+        $objectManager->setBackwardCompatibleProperty(
+            $this->abstractElementMock,
+            '_escaper',
+            $escaper
+        );
 
         $this->formMock = $this->getMockBuilder(Form::class)
             ->disableOriginalConstructor()

app/code/Magento/Analytics/Test/Unit/Block/Adminhtml/System/Config/VerticalTest.php

@@ -42,10 +42,11 @@ protected function setUp()
 
         $objectManager = new ObjectManager($this);
         $escaper = $objectManager->getObject(\Magento\Framework\Escaper::class);
-        $reflection = new \ReflectionClass($this->abstractElementMock);
-        $reflection_property = $reflection->getProperty('_escaper');
-        $reflection_property->setAccessible(true);
-        $reflection_property->setValue($this->abstractElementMock, $escaper);
+        $objectManager->setBackwardCompatibleProperty(
+            $this->abstractElementMock,
+            '_escaper',
+            $escaper
+        );
 
         $this->contextMock = $this->getMockBuilder(Context::class)
             ->disableOriginalConstructor()

app/code/Magento/Customer/Test/Unit/Model/Renderer/RegionTest.php

@@ -63,10 +63,11 @@ public function testRender($regionCollection)
 
         $objectManager = new ObjectManager($this);
         $escaper = $objectManager->getObject(\Magento\Framework\Escaper::class);
-        $reflection = new \ReflectionClass($elementMock);
-        $reflection_property = $reflection->getProperty('_escaper');
-        $reflection_property->setAccessible(true);
-        $reflection_property->setValue($elementMock, $escaper);
+        $objectManager->setBackwardCompatibleProperty(
+            $elementMock,
+            '_escaper',
+            $escaper
+        );
 
         $formMock->expects(
             $this->any()

app/code/Magento/Paypal/Test/Unit/Block/Adminhtml/System/Config/Field/Enable/AbstractEnableTest.php

@@ -33,8 +33,6 @@ class AbstractEnableTest extends \PHPUnit\Framework\TestCase
      */
     protected function setUp()
     {
-        $objectManager = new \Magento\Framework\TestFramework\Unit\Helper\ObjectManager($this);
-
         $this->elementMock = $this->getMockBuilder(\Magento\Framework\Data\Form\Element\AbstractElement::class)
             ->setMethods(
                 [
@@ -48,10 +46,11 @@ protected function setUp()
 
         $objectManager = new ObjectManager($this);
         $escaper = $objectManager->getObject(\Magento\Framework\Escaper::class);
-        $reflection = new \ReflectionClass($this->elementMock);
-        $reflection_property = $reflection->getProperty('_escaper');
-        $reflection_property->setAccessible(true);
-        $reflection_property->setValue($this->elementMock, $escaper);
+        $objectManager->setBackwardCompatibleProperty(
+            $this->elementMock,
+            '_escaper',
+            $escaper
+        );
 
         $this->abstractEnable = $objectManager->getObject(
             \Magento\Paypal\Test\Unit\Block\Adminhtml\System\Config\Field\Enable\AbstractEnable\Stub::class,