Add AppListStrings Legacy Handler

- Add AppListStrings Legacy handler
- Update AppListStrings Item data provider to use legacy handler
- Add unit tests for legacy handler

tests/unit/legacy/AppListStringsHandlerTest.php

@@ -0,0 +1,67 @@
+<?php namespace App\Tests;
+
+use ApiPlatform\Core\Exception\ItemNotFoundException;
+use App\Entity\AppListStrings;
+use Codeception\Test\Unit;
+use SuiteCRM\Core\Legacy\AppListStringsHandler;
+
+class AppListStringsHandlerTest extends Unit
+{
+    /**
+     * @var UnitTester
+     */
+    protected $tester;
+
+    /**
+     * @var AppListStringsHandler
+     */
+    protected $handler;
+
+    protected function _before()
+    {
+        $projectDir = codecept_root_dir();
+        $legacyDir = $projectDir . '/legacy';
+        $legacySessionName = 'LEGACYSESSID';
+        $defaultSessionName = 'PHPSESSID';
+        $this->handler = new AppListStringsHandler($projectDir, $legacyDir, $legacySessionName, $defaultSessionName);
+    }
+
+    // tests
+
+    /**
+     * Test Invalid language handling in AppListStringsHandler
+     */
+    public function testInvalidLanguageCheck()
+    {
+        $this->expectException(ItemNotFoundException::class);
+        $this->handler->getAppListStrings('invalid_lang');
+    }
+
+    /**
+     * Test default language retrieval in AppListStringsHandler
+     */
+    public function testDefaultLanguageKey()
+    {
+        $appListStrings = $this->handler->getAppListStrings('en_us');
+        static::assertNotNull($appListStrings);
+        static::assertEquals('en_us', $appListStrings->getId());
+        static::assertIsArray($appListStrings->getItems());
+        $this->assertLanguageListKey('moduleListSingular', 'Home', $appListStrings);
+        $this->assertLanguageListKey('moduleList', 'Home', $appListStrings);
+    }
+
+    /**
+     * Asserts that the given label $labelKey exists within the given list with $listKey in appListStrings
+     * @param string $listKey
+     * @param string $labelKey
+     * @param AppListStrings $appStrings
+     */
+    protected function assertLanguageListKey(string $listKey, string $labelKey, AppListStrings $appStrings)
+    {
+        static::assertArrayHasKey($listKey, $appStrings->getItems());
+        static::assertNotEmpty($appStrings->getItems()[$listKey]);
+        static::assertIsArray($appStrings->getItems()[$listKey]);
+        static::assertNotEmpty($appStrings->getItems()[$listKey][$labelKey]);
+    }
+
+}