MAGETWO-36982: Create Search Module API to support search functionality.

 - MAGETWO-39542: Implement Product::search method

 - Removed test testSave in EngineTest

Author: aohorodnyk

app/code/Magento/CatalogSearch/Test/Unit/Model/Resource/EngineTest.php

@@ -49,64 +49,6 @@ protected function setUp()
         );
     }
 
-    /**
-     * @dataProvider saveDataProvider
-     */
-    public function testSaveIndex($storeId, $entityIndexes, $expected)
-    {
-        $dimension = $this->getMockBuilder('\Magento\Framework\Search\Request\Dimension')
-            ->disableOriginalConstructor()
-            ->setMethods(['getName', 'getValue'])
-            ->getMock();
-        $dimension->expects($this->any())->method('getName')->willReturn('scope');
-        $dimension->expects($this->any())->method('getValue')->willReturn($storeId);
-        if ($expected) {
-            $this->connection->expects($this->once())
-                ->method('insertOnDuplicate')
-                ->with(null, $expected, ['data_index'])
-                ->willReturnSelf();
-        }
-        $this->target->saveIndex([$dimension], $entityIndexes);
-    }
-
-    public function saveDataProvider()
-    {
-        return [
-            'empty' => [
-                null,
-                new \ArrayIterator([]),
-                []
-            ],
-            'correctData' => [
-                13,
-                new \ArrayIterator([
-                    28 => [
-                        123 => 'Value of 123',
-                        845 => 'Value of 845',
-                        'options' => 'Some | Index | Value'
-                    ]
-                ]),
-                [
-                    [
-                        'product_id' => 28,
-                        'attribute_id' => 123,
-                        'data_index' => 'Value of 123'
-                    ],
-                    [
-                        'product_id' => 28,
-                        'attribute_id' => 845,
-                        'data_index' => 'Value of 845'
-                    ],
-                    [
-                        'product_id' => 28,
-                        'attribute_id' => 0,
-                        'data_index' => 'Some | Index | Value'
-                   ]
-                ]
-            ]
-        ];
-    }
-
     /**
      * @param null|string $expected
      * @param array $data