Added Alias tests

Check if service fetched by alias and by name directly is exactly the
same service

src/AliasTestTrait.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * @see       https://github.com/zendframework/zend-container-test for the canonical source repository
+ * @copyright Copyright (c) 2018 Zend Technologies USA Inc. (https://www.zend.com)
+ * @license   https://github.com/zendframework/zend-container-test/blob/master/LICENSE.md New BSD License
+ */
+
+declare(strict_types=1);
+
+namespace Zend\ContainerTest;
+
+use Generator;
+
+trait AliasTestTrait
+{
+    public function alias() : Generator
+    {
+        yield 'alias-invokable' => [
+            [
+                'aliases' => ['alias' => 'service'],
+                'invokables' => ['service' => TestAsset\Service::class],
+            ]
+        ];
+        yield 'alias-factory' => [
+            [
+                'aliases' => ['alias' => 'service'],
+                'factories' => ['service' => TestAsset\Factory::class],
+            ]
+        ];
+    }
+
+    /**
+     * @dataProvider alias
+     */
+    public function testAliasGetServiceFirst(array $config) : void
+    {
+        $container = $this->createContainer($config);
+
+        self::assertTrue($container->has('service'));
+        self::assertTrue($container->has('alias'));
+        self::assertSame($container->get('service'), $container->get('alias'));
+    }
+
+    /**
+     * @dataProvider alias
+     */
+    public function testAliasGetAliasFirst(array $config) : void
+    {
+        $container = $this->createContainer($config);
+
+        self::assertTrue($container->has('alias'));
+        self::assertTrue($container->has('service'));
+        self::assertSame($container->get('alias'), $container->get('service'));
+    }
+}

test/BaseContainerTest.php

@@ -9,13 +9,15 @@
 
 namespace ZendTest\ContainerTest;
 
+use Zend\ContainerTest\AliasTestTrait;
 use Zend\ContainerTest\ContainerTest;
 use Zend\ContainerTest\FactoryTestTrait;
 use Zend\ContainerTest\InvokableTestTrait;
 use Zend\ContainerTest\SharedTestTrait;
 
 abstract class BaseContainerTest extends ContainerTest
 {
+    use AliasTestTrait;
     use FactoryTestTrait;
     use InvokableTestTrait;
     use SharedTestTrait;