Added services configuration test

Author: michalbundyra

README.md

@@ -40,6 +40,7 @@ following traits into your test case:
 - `Zend\ContainerTest\AliasTestTrait` - to support `aliases` configuration,
 - `Zend\ContainerTest\FactoryTestTrait` - to support `factories` configuration,
 - `Zend\ContainerTest\InvokableTestTrait` - to support `invokables` configuration,
+- `Zend\ContainerTest\ServiceTestTrait` - to support `services` configuration,
 - `Zend\ContainerTest\SharedTestTrait` - to support `shared` and `shared_by_default` configurations,
 
 or use `Zend\ContainerTest\AllTestTrait` to support whole `zend-servicemanager` configuration.

src/AllTestTrait.php

@@ -14,5 +14,6 @@ trait AllTestTrait
     use AliasTestTrait;
     use FactoryTestTrait;
     use InvokableTestTrait;
+    use ServiceTestTrait;
     use SharedTestTrait;
 }

src/ServiceTestTrait.php

@@ -0,0 +1,28 @@
+<?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;
+
+trait ServiceTestTrait
+{
+    public function testService()
+    {
+        $service = new TestAsset\Service();
+        $config = [
+            'services' => [
+                'foo-bar' => $service,
+            ],
+        ];
+
+        $container = $this->createContainer($config);
+
+        self::assertTrue($container->has('foo-bar'));
+        self::assertSame($service, $container->get('foo-bar'));
+    }
+}