35481:Modified the implementation and automation test case

Author: engcom-Charlie

app/code/Magento/Theme/Test/Unit/Block/Html/HeaderTest.php

@@ -14,6 +14,7 @@
 use Magento\Theme\Block\Html\Header;
 use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
+use Magento\Framework\Escaper;
 
 class HeaderTest extends TestCase
 {
@@ -27,6 +28,11 @@ class HeaderTest extends TestCase
      */
     protected $scopeConfig;
 
+    /**
+     * @var Escaper|MockObject
+     */
+    private $escaper;
+
     protected function setUp(): void
     {
         $context = $this->getMockBuilder(Context::class)
@@ -38,10 +44,13 @@ protected function setUp(): void
             ->disableOriginalConstructor()
             ->getMock();
         $context->expects($this->once())->method('getScopeConfig')->willReturn($this->scopeConfig);
-
+        $this->escaper = $this->createPartialMock(Escaper::class, ['escapeQuote']);
         $this->unit = (new ObjectManager($this))->getObject(
             Header::class,
-            ['context' => $context]
+            [
+               'context' => $context,
+               'escaper' => $this->escaper
+            ]
         );
     }
 
@@ -51,6 +60,11 @@ public function testGetWelcomeDefault()
             ->with('design/header/welcome', ScopeInterface::SCOPE_STORE)
             ->willReturn('Welcome Message');
 
+        $this->escaper->expects($this->once())
+            ->method('escapeQuote')
+            ->with('Welcome Message', true)
+            ->willReturn('Welcome Message');
+
         $this->assertEquals('Welcome Message', $this->unit->getWelcome());
     }
 }