Added test case for PR #43

Author: koza4ok

test/ZendViewRendererTest.php

@@ -430,4 +430,27 @@ public function testWillRenderAViewModel()
         $content = str_replace('<?php echo $name ?>', 'Zend', $content);
         $this->assertEquals($content, $result);
     }
+    
+    public function testCanRenderWithChildViewModel()
+    {
+        $path = __DIR__ . '/TestAsset';
+        $renderer = new ZendViewRenderer();
+        $renderer->addPath($path);
+        $viewModelParent = new ViewModel();
+        $viewModelChild = new ViewModel();
+        $viewModelChild->setTemplate('zendview-null');
+        $viewModelParent->setVariables([
+                'layout' => 'zendview-layout',
+        ]);
+        $viewModelParent->addChild($viewModelChild, 'name');
+        $result = $renderer->render('zendview', $viewModelParent);
+        
+        $content = file_get_contents("$path/zendview-null.phtml");
+        $contentParent = file_get_contents("$path/zendview.phtml");
+        $contentParentLayout = file_get_contents("$path/zendview-layout.phtml");
+        //trim is used here, because rendering engine is trimming content too 
+        $content = trim(str_replace('<?php echo $name ?>', $content, $contentParent));
+        $content = str_replace('<?= $this->content ?>', $content, $contentParentLayout);
+        $this->assertEquals($content, $result);
+    }
 }