MAGETWO-71373: Cannot Install Magento without Some Modules

Author: aakimov

lib/internal/Magento/Framework/EntityManager/OperationPool.php

@@ -8,12 +8,28 @@
 
 use Magento\Framework\ObjectManagerInterface as ObjectManager;
 use Magento\Framework\EntityManager\OperationInterface;
+use Magento\Framework\EntityManager\Operation\CheckIfExists;
+use Magento\Framework\EntityManager\Operation\Read;
+use Magento\Framework\EntityManager\Operation\Create;
+use Magento\Framework\EntityManager\Operation\Update;
+use Magento\Framework\EntityManager\Operation\Delete;
 
 /**
  * Class OperationPool
  */
 class OperationPool
 {
+    /**
+     * @var array
+     */
+    private $defaultOperations = [
+        'checkIfExists' => CheckIfExists::class,
+        'read' => Read::class,
+        'create' => Create::class,
+        'update' => Update::class,
+        'delete' => Delete::class,
+    ];
+
     /**
      * @var array
      */
@@ -31,10 +47,13 @@ class OperationPool
      */
     public function __construct(
         ObjectManager $objectManager,
-        $operations
+        $operations = []
     ) {
         $this->objectManager = $objectManager;
-        $this->operations = $operations;
+        $this->operations = array_replace_recursive(
+            ['default' => $this->defaultOperations],
+            $operations
+        );
     }
 
     /**

lib/internal/Magento/Framework/EntityManager/Test/Unit/OperationPoolTest.php

@@ -0,0 +1,47 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Framework\EntityManager\Test\Unit;
+
+use PHPUnit\Framework\TestCase;
+use Magento\Framework\ObjectManagerInterface;
+use Magento\Framework\EntityManager\OperationPool;
+
+class OperationPoolTest extends TestCase
+{
+    public function testGetOperationUsesDefaultValueForEntityThatDoesNotProvideCustomMapping()
+    {
+        $objectManagerMock = $this->createMock(ObjectManagerInterface::class);
+        $operationPool = new OperationPool(
+            $objectManagerMock,
+            []
+        );
+
+        $objectManagerMock->expects($this->once())
+            ->method('get')
+            ->with('Magento\Framework\EntityManager\Operation\Read');
+        $operationPool->getOperation('entity_type', 'read');
+    }
+
+    public function testGetOperationUsesOverriddenDefaultValueForEntityThatDoesNotProvideCustomMapping()
+    {
+        $customReadOperation = 'CustomReadOperation';
+        $objectManagerMock = $this->createMock(ObjectManagerInterface::class);
+        $operationPool = new OperationPool(
+            $objectManagerMock,
+            [
+                'default' => [
+                    'read' => $customReadOperation,
+                    'new' => 'CustomNewOperation',
+                ],
+            ]
+        );
+
+        $objectManagerMock->expects($this->once())
+            ->method('get')
+            ->with($customReadOperation);
+        $operationPool->getOperation('entity_type', 'read');
+    }
+}