magento/magento2#: Remove a redundant getMappedNums from a loop

lib/internal/Magento/Framework/GraphQl/Query/EnumLookup.php

@@ -7,6 +7,7 @@
 
 namespace Magento\Framework\GraphQl\Query;
 
+use Magento\Framework\Exception\RuntimeException;
 use Magento\Framework\GraphQl\Config\Element\Enum;
 use Magento\Framework\GraphQl\ConfigInterface;
 use Magento\Framework\GraphQl\Schema\Type\Enum\DataMapperInterface;
@@ -43,23 +44,27 @@ public function __construct(ConfigInterface $typeConfig, DataMapperInterface $en
      * @param string $enumName
      * @param string $fieldValue
      * @return string
-     * @throws \Magento\Framework\Exception\RuntimeException
+     * @throws RuntimeException
      */
     public function getEnumValueFromField(string $enumName, string $fieldValue) : string
     {
-        $priceViewEnum = $this->typeConfig->getConfigElement($enumName);
-        if ($priceViewEnum instanceof Enum) {
-            foreach ($priceViewEnum->getValues() as $enumItem) {
-                $mappedValues = $this->enumDataMapper->getMappedEnums($enumName);
-                if (isset($mappedValues[$enumItem->getName()]) && $mappedValues[$enumItem->getName()] == $fieldValue) {
-                    return $enumItem->getValue();
-                }
-            }
-        } else {
-            throw new \Magento\Framework\Exception\RuntimeException(
+        /** @var Enum $enumObject */
+        $enumObject = $this->typeConfig->getConfigElement($enumName);
+
+        if (!($enumObject instanceof Enum)) {
+            throw new RuntimeException(
                 new Phrase('Enum type "%1" not defined', [$enumName])
             );
         }
+
+        $mappedValues = $this->enumDataMapper->getMappedEnums($enumName);
+
+        foreach ($enumObject->getValues() as $enumItem) {
+            if (isset($mappedValues[$enumItem->getName()]) && $mappedValues[$enumItem->getName()] == $fieldValue) {
+                return $enumItem->getValue();
+            }
+        }
+
         return '';
     }
 }

lib/internal/Magento/Framework/GraphQl/Test/Unit/Query/EnumLookupTest.php

@@ -0,0 +1,154 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Framework\GraphQl\Test\Unit\Query;
+
+use Magento\Framework\Config\DataInterface;
+use Magento\Framework\GraphQl\Config\ConfigElementFactoryInterface;
+use Magento\Framework\GraphQl\Config\Element\Enum;
+use Magento\Framework\GraphQl\Config\Element\EnumValue;
+use Magento\Framework\GraphQl\ConfigInterface;
+use Magento\Framework\GraphQl\Query\EnumLookup;
+use Magento\Framework\GraphQl\Query\Fields as QueryFields;
+use Magento\Framework\GraphQl\Schema\Type\Enum\DataMapperInterface;
+use Magento\Framework\TestFramework\Unit\Helper\ObjectManager;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit test for \Magento\Framework\GraphQl\Query\EnumLookup
+ */
+class EnumLookupTest extends TestCase
+{
+    private const ENUM_NAME = 'SubscriptionStatusesEnum';
+
+    /**
+     * @var DataInterface|MockObject
+     */
+    private $configDataMock;
+
+    /**
+     * @var ConfigElementFactoryInterface|MockObject
+     */
+    private $configElementFactoryMock;
+
+    /**
+     * @var DataMapperInterface|MockObject
+     */
+    private $enumDataMapperMock;
+
+    /**
+     * Testable Object
+     *
+     * @var EnumLookup
+     */
+    private $enumLookup;
+
+    /**
+     * @var Enum|MockObject
+     */
+    private $enumMock;
+
+    /**
+     * Object Manager Instance
+     *
+     * @var ObjectManager
+     */
+    private $objectManager;
+
+    /**
+     * @var QueryFields|MockObject
+     */
+    private $queryFieldsMock;
+
+    /**
+     * @var ConfigInterface|MockObject
+     */
+    private $typeConfigMock;
+
+    /**
+     * @var array
+     */
+    private $map = [];
+
+    /**
+     * @var array
+     */
+    private $values = [];
+
+    protected function setUp(): void
+    {
+        $this->objectManager = new ObjectManager($this);
+
+        $this->map = [
+            self::ENUM_NAME => [
+                'subscribed' => '1',
+                'not_active' => '2',
+                'unsubscribed' => '3',
+                'unconfirmed' => '4',
+            ]
+        ];
+
+        $this->values = [
+            'NOT_ACTIVE' => new EnumValue('not_active', 'NOT_ACTIVE'),
+            'SUBSCRIBED' => new EnumValue('subscribed', 'SUBSCRIBED'),
+            'UNSUBSCRIBED' => new EnumValue('unsubscribed', 'UNSUBSCRIBED'),
+            'UNCONFIRMED' => new EnumValue('unconfirmed', 'UNCONFIRMED'),
+        ];
+
+        $this->enumMock = $this->getMockBuilder(Enum::class)
+            ->setConstructorArgs(
+                [
+                    self::ENUM_NAME,
+                    $this->values,
+                    'Subscription statuses',
+                ]
+            )
+            ->getMock();
+
+        $this->enumDataMapperMock = $this->createMock(DataMapperInterface::class);
+        $this->configDataMock = $this->createMock(DataInterface::class);
+        $this->configElementFactoryMock = $this->createMock(ConfigElementFactoryInterface::class);
+        $this->queryFieldsMock = $this->createMock(QueryFields::class);
+        $this->typeConfigMock = $this->createMock(ConfigInterface::class);
+
+        $this->enumLookup = $this->objectManager->getObject(
+            EnumLookup::class,
+            [
+                'typeConfig' => $this->typeConfigMock,
+                'enumDataMapper' => $this->enumDataMapperMock,
+            ]
+        );
+    }
+
+    public function testGetEnumValueFromField()
+    {
+        $enumName = self::ENUM_NAME;
+        $fieldValue = '1';
+
+        $this->enumDataMapperMock
+            ->expects($this->once())
+            ->method('getMappedEnums')
+            ->willReturn($this->map[$enumName]);
+
+        $this->typeConfigMock
+            ->expects($this->once())
+            ->method('getConfigElement')
+            ->willReturn($this->enumMock);
+
+        $this->enumMock
+            ->expects($this->once())
+            ->method('getValues')
+            ->willReturn($this->values);
+
+        $this->assertEquals(
+            'SUBSCRIBED',
+            $this->enumLookup->getEnumValueFromField($enumName, $fieldValue)
+        );
+    }
+}