MAGETWO-59088: [MySQL] Layered navigation contains filters for out of stock products

  - Add unit test for AliasResolver

Author: igrybkov

app/code/Magento/CatalogSearch/Test/Unit/Model/Adapter/Mysql/Filter/AliasResolverTest.php

@@ -0,0 +1,68 @@
+<?php
+/**
+ * Copyright © 2016 Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\CatalogSearch\Test\Unit\Model\Adapter\Mysql\Filter;
+
+use Magento\CatalogSearch\Model\Search\RequestGenerator;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager as ObjectManagerHelper;
+
+class AliasResolverTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \Magento\CatalogSearch\Model\Adapter\Mysql\Filter\AliasResolver
+     */
+    private $aliasResolver;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp()
+    {
+        $objectManagerHelper = new ObjectManagerHelper($this);
+        $this->aliasResolver = $objectManagerHelper->getObject(
+            \Magento\CatalogSearch\Model\Adapter\Mysql\Filter\AliasResolver::class,
+            []
+        );
+    }
+
+    /**
+     * @param string $field
+     * @param string $expectedAlias
+     * @dataProvider aliasDataProvider
+     */
+    public function testGetFilterAlias($field, $expectedAlias)
+    {
+        $filter = $this->getMockBuilder(\Magento\Framework\Search\Request\Filter\Term::class)
+            ->setMethods(['getField'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $filter->expects($this->once())
+            ->method('getField')
+            ->willReturn($field);
+        $this->assertSame($expectedAlias, $this->aliasResolver->getAlias($filter));
+    }
+
+    /**
+     * @return array
+     */
+    public function aliasDataProvider()
+    {
+        return [
+            'general' => [
+                'field' => 'general',
+                'alias' => 'general' . RequestGenerator::FILTER_SUFFIX,
+            ],
+            'price' => [
+                'field' => 'price',
+                'alias' => 'price_index',
+            ],
+            'category_ids' => [
+                'field' => 'category_ids',
+                'alias' => 'category_ids_index',
+            ],
+        ];
+    }
+}