ENGCOM-6250: [Instant Purchase] Cover Button block with Unit Test #25504

 - Merge Pull Request #25504 from edenduong/magento2:2.3-testcover/cover_button_block_instant_purchased
 - Merged commits:
   1. c3bf354

Author: magento-engcom-team

app/code/Magento/InstantPurchase/Test/Unit/Block/ButtonTest.php

@@ -0,0 +1,138 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\InstantPurchase\Test\Unit\Block;
+
+use Magento\InstantPurchase\Block\Button;
+use Magento\InstantPurchase\Model\Config;
+use Magento\Framework\View\Element\Template\Context;
+use Magento\Store\Model\StoreManagerInterface;
+use Magento\Store\Api\Data\StoreInterface;
+
+/**
+ * Test class for button block
+ *
+ * Class \Magento\InstantPurchase\Test\Unit\Block\ButtonTest
+ */
+class ButtonTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var Button | \PHPUnit_Framework_MockObject_MockObject
+     */
+    private $block;
+
+    /**
+     * @var Config | \PHPUnit_Framework_MockObject_MockObject
+     */
+    private $config;
+
+    /**
+     * @var StoreManagerInterface | \PHPUnit_Framework_MockObject_MockObject
+     */
+    private $storeManager;
+
+    /**
+     * @var StoreInterface | \PHPUnit_Framework_MockObject_MockObject
+     */
+    private $store;
+
+    /**
+     * @var Context | \PHPUnit_Framework_MockObject_MockObject
+     */
+    private $context;
+
+    /**
+     * Setup environment for testing
+     */
+    protected function setUp()
+    {
+        $this->context = $this->createMock(Context::class);
+        $this->storeManager = $this->createMock(StoreManagerInterface::class);
+        $this->store = $this->createMock(StoreInterface::class);
+
+        $this->storeManager->expects($this->any())->method('getStore')
+            ->willReturn($this->store);
+
+        $this->config = $this->createMock(Config::class);
+
+        $this->context->expects($this->any())->method('getStoreManager')
+            ->willReturn($this->storeManager);
+
+        $this->block = $this->getMockBuilder(Button::class)
+            ->setConstructorArgs(
+                [
+                    'context' => $this->context,
+                    'instantPurchaseConfig' => $this->config
+                ]
+            )
+            ->setMethods(['getUrl'])
+            ->getMock();
+    }
+
+    /**
+     * Test isEnabled() function
+     *
+     * @param $currentStoreId
+     * @param $isModuleEnabled
+     * @param $expected
+     * @dataProvider isEnabledDataProvider
+     */
+    public function testIsEnabled($currentStoreId, $isModuleEnabled, $expected)
+    {
+        $this->store->expects($this->any())->method('getId')
+            ->willReturn($currentStoreId);
+
+        $this->config->expects($this->any())->method('isModuleEnabled')
+            ->willReturn($isModuleEnabled);
+
+        $this->assertEquals($expected, $this->block->isEnabled());
+    }
+
+    /**
+     * Data Provider for test isEnabled()
+     *
+     * @return array
+     */
+    public function isEnabledDataProvider()
+    {
+        return [
+            'Store With ID = 1 and enable module' => [
+                1,
+                true,
+                true
+            ],
+            'Store With ID = 1 and disable module' => [
+                1,
+                false,
+                false
+            ]
+        ];
+    }
+
+    /**
+     * Test getJsLayout() function
+     */
+    public function testGetJsLayout()
+    {
+        $currentStoreId = 1;
+        $buttonText = 'Instant Purchased';
+        $url = 'https://magento2.com/instantpurchase/button/placeOrder';
+        $expected = '{"components":{"instant-purchase":{"config":{"buttonText":"Instant Purchased",' .
+            '"purchaseUrl":"https:\/\/magento2.com\/instantpurchase\/button\/placeOrder"}}}}';
+
+        $this->store->expects($this->any())->method('getId')
+            ->willReturn($currentStoreId);
+        $this->config->expects($this->any())->method('getButtonText')
+            ->willReturn($buttonText);
+        $this->block->expects($this->any())->method('getUrl')
+            ->with('instantpurchase/button/placeOrder', ['_secure' => true])
+            ->willReturn($url);
+
+        $this->assertEquals($expected, $this->block->getJsLayout());
+    }
+}