#8647: [GitHub] Order of how arguments are merged in multiple di.xml-files causes unexpected results

Author: serhii-balko

lib/internal/Magento/Framework/Webapi/Rest/Response/RendererFactory.php

@@ -71,7 +71,12 @@ protected function _getRendererClass()
         if (!is_array($acceptTypes)) {
             $acceptTypes = [$acceptTypes];
         }
+        // If Accept type = '*/*' then return default renderer.
+        $defaultRenderer = isset($this->_renders['default']) ? $this->_renders['default'] : null; 
         foreach ($acceptTypes as $acceptType) {
+            if ($acceptType == '*/*' && $defaultRenderer) {
+                return $defaultRenderer['model'];
+            }
             foreach ($this->_renders as $rendererConfig) {
                 $rendererType = $rendererConfig['type'];
                 if ($acceptType == $rendererType || $acceptType == current(

lib/internal/Magento/Framework/Webapi/Test/Unit/Rest/Response/RendererFactoryTest.php

@@ -26,11 +26,18 @@ protected function setUp()
         )->disableOriginalConstructor()->getMock();
 
         $renders = [
-            'default' => ['type' => '*/*', 'model' => \Magento\Framework\Webapi\Rest\Response\Renderer\Json::class],
+            'application_xml' => [
+                'type' => 'application/xml',
+                'model' => \Magento\Framework\Webapi\Rest\Response\Renderer\Xml::class,
+            ],
             'application_json' => [
                 'type' => 'application/json',
                 'model' => \Magento\Framework\Webapi\Rest\Response\Renderer\Json::class,
             ],
+            'default' => [
+                'type' => '*/*', 
+                'model' => \Magento\Framework\Webapi\Rest\Response\Renderer\Json::class
+            ],
         ];
 
         $this->_factory = new \Magento\Framework\Webapi\Rest\Response\RendererFactory(
@@ -42,29 +49,43 @@ protected function setUp()
 
     /**
      * Test GET method.
+     *
+     * @param array $acceptTypes
+     * @param string $model
+     * @dataProvider getTestDataProvider
      */
-    public function testGet()
+    public function testGet($acceptTypes, $model)
     {
-        $acceptTypes = ['application/json'];
-
         /** Mock request getAcceptTypes method to return specified value. */
         $this->_requestMock->expects($this->once())->method('getAcceptTypes')->will($this->returnValue($acceptTypes));
         /** Mock renderer. */
-        $rendererMock = $this->getMockBuilder(
-            \Magento\Framework\Webapi\Rest\Response\Renderer\Json::class
-        )->disableOriginalConstructor()->getMock();
+        $rendererMock = $this->getMockBuilder($model)->disableOriginalConstructor()->getMock();
         /** Mock object to return mocked renderer. */
         $this->_objectManagerMock->expects(
             $this->once()
         )->method(
             'get'
         )->with(
-            \Magento\Framework\Webapi\Rest\Response\Renderer\Json::class
+            $model
         )->will(
             $this->returnValue($rendererMock)
         );
         $this->_factory->get();
     }
+    
+    /**
+     * Data provider for method testGet
+     *
+     * @return array
+     */
+    public function getTestDataProvider()
+    {
+        return [
+            [['*/*'], \Magento\Framework\Webapi\Rest\Response\Renderer\Json::class],
+            [['application/json'], \Magento\Framework\Webapi\Rest\Response\Renderer\Json::class],
+            [['application/xml'], \Magento\Framework\Webapi\Rest\Response\Renderer\Xml::class],
+        ];
+    }
 
     /**
      * Test GET method with wrong Accept HTTP Header.