Add unit test

tests/unit/WooCommerce/TransactionalEmailsTest.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace MailPoet\WooCommerce;
+
+use Codeception\Stub;
+use MailPoet\Settings\SettingsController;
+use MailPoet\WP\Functions as WPFunctions;
+
+class TransactionalEmailsTest extends \MailPoetUnitTest {
+
+  function testGetEmailHeadings() {
+    $wp = Stub::make(new WPFunctions, [
+      'getOption' => function($name) {
+        if ($name === 'woocommerce_new_order_settings')
+        return ['heading' => '{site_title}: New Order: #{order_number}'];
+        if ($name === 'woocommerce_customer_completed_order_settings')
+        return ['heading' => 'Thanks for shopping at {site_address}'];
+        if ($name === 'woocommerce_customer_note_settings')
+          return ['heading' => 'Note added to order #{order_number} - {order_date}'];
+        if ($name === 'blogname')
+          return 'Test';
+        return false;
+      },
+      'homeUrl' => 'http://test.loc',
+      'wpSpecialcharsDecode' => function($text) {
+        expect($text)->equals('Test');
+        return $text;
+      },
+      'wpParseUrl' => function($url) {
+        expect($url)->equals('http://test.loc');
+        return 'test.loc';
+      },
+    ]);
+    $settings = Stub::make(SettingsController::class);
+    $transactional_emails = new TransactionalEmails($wp, $settings);
+    expect($transactional_emails->getEmailHeadings())->equals([
+      'new_account' => 'Test: New Order: #0001',
+      'processing_order' => 'Thank you for your order',
+      'completed_order' => 'Thanks for shopping at test.loc',
+      'customer_note' => 'Note added to order #0001 - ' . date('Y-m-d'),
+    ]);
+  }
+
+}