ACP2E-682: [Magento Cloud] - Add to cart button translation reverts back to English after clicking

 - Added the test coverage.

Author: devarul

app/code/Magento/Translation/Test/Unit/Model/Js/PreProcessorTest.php

@@ -0,0 +1,114 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Translation\Test\Unit\Model\Js;
+
+use Magento\Framework\App\Area;
+use Magento\Framework\App\AreaList;
+use Magento\Framework\TranslateInterface;
+use Magento\Framework\View\Asset\File;
+use Magento\Framework\View\Asset\File\FallbackContext;
+use Magento\Framework\View\Asset\PreProcessor\Chain;
+use Magento\Translation\Model\Js\Config;
+use Magento\Translation\Model\Js\PreProcessor;
+use PHPUnit\Framework\TestCase;
+
+class PreProcessorTest extends TestCase
+{
+    /**
+     * @var PreProcessor
+     */
+    private PreProcessor $model;
+
+    /**
+     * @var Config|MockObject
+     */
+    private $configMock;
+
+    /**
+     * @var AreaList|MockObject
+     */
+    private $areaListMock;
+
+    /**
+     * @var TranslateInterface|MockObject
+     */
+    private $translateMock;
+
+    /**
+     * @inheritdoc
+     */
+    protected function setUp(): void
+    {
+        $this->configMock = $this->createMock(Config::class);
+        $this->areaListMock = $this->createMock(AreaList::class);
+        $this->translateMock = $this->getMockForAbstractClass(TranslateInterface::class);
+        $this->model = new PreProcessor(
+            $this->configMock,
+            $this->areaListMock,
+            $this->translateMock
+        );
+    }
+
+    /**
+     * Test 'process' method.
+     *
+     */
+    public function testProcess()
+    {
+        $areaCode = 'frontend';
+        $themePath = '*/*';
+
+        $chain = $this->createMock(Chain::class);
+        $asset = $this->createMock(File::class);
+        $context = $this->createMock(FallbackContext::class);
+        $area = $this->createMock(Area::class);
+        $this->configMock->expects($this->once())
+            ->method('isEmbeddedStrategy')
+            ->willReturn(1);
+        $chain->expects($this->once())
+            ->method('getAsset')
+            ->willReturn($asset);
+        $asset->expects($this->once())
+            ->method('getContext')
+            ->willReturn($context);
+        $context->expects($this->atLeastOnce())
+            ->method('getAreaCode')
+            ->willReturn($areaCode);
+        $context->expects($this->atLeastOnce())
+            ->method('getLocale')
+            ->willReturn('nl_NL');
+        $this->translateMock->expects($this->once())
+            ->method('setLocale')
+            ->with('nl_NL')
+            ->willReturnSelf();
+        $context->expects($this->atLeastOnce())
+            ->method('getThemePath')
+            ->willReturn($themePath);
+        $this->translateMock->expects($this->once())
+            ->method('loadData')
+            ->with($areaCode, false)
+            ->willReturnSelf();
+        $area->expects($this->once())->method('load')->willReturnSelf();
+        $this->areaListMock->expects($this->once())
+            ->method('getArea')
+            ->with($areaCode)
+            ->willReturn($area);
+        $chain->expects($this->once())
+            ->method('getContent')
+            ->willReturn('$t("Add to Cart")');
+        $this->configMock->expects($this->any())
+            ->method('getPatterns')
+            ->willReturn(new \ArrayIterator(
+                [
+                    '~(?s)\$t\(\s*([\'"])(\?\<translate\>.+?)(?<!\\\)\1\s*(*SKIP)\)(?s)~',
+                    '~\$\.mage\.__\(([\'"])(.+?)\1\)~'
+                ],
+            ));
+        $this->model->process($chain);
+    }
+}