Cover changes with unit test

Author: Nazar65

lib/internal/Magento/Framework/Code/Test/Unit/Reader/https:/github.com/ven-com/magento2/tree/ClassReaderTest.php

@@ -0,0 +1,98 @@
+<?php
+/**
+ *
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Framework\Code\Test\Unit\Reader;
+
+use Magento\Framework\Code\Reader\ClassReader;
+use PHPUnit\Framework\TestCase;
+
+require_once __DIR__ . '/_files/ClassesForArgumentsReader.php';
+
+class ClassReaderTest extends TestCase
+{
+
+    /**
+     * @var ClassReader $model
+     */
+    private $model;
+
+    /**
+     * @inheritDoc
+     */
+    protected function setUp()
+    {
+        $this->model = new ClassReader();
+    }
+
+    /**
+     * Get constructor test
+     *
+     * @param array $testData
+     * @dataProvider getTestData
+     * @throws \ReflectionException
+     */
+    public function testGetConstructor(array $testData)
+    {
+        $this->assertEquals(
+            $testData,
+            $this->model->getConstructor('FirstClassForParentCall')
+        );
+    }
+
+    /**
+     * Ensure that if we have cached class then returns this class
+     */
+    public function testGetParents()
+    {
+        $model = new ClassReader();
+        $this->assertEquals([0 => 'FirstClassForParentCall'], $model->getParents('ThirdClassForParentCall'));
+        $reflection = new \ReflectionClass(ClassReader::class);
+        $expectedClass = $reflection->getProperty('parentsCache');
+        $expectedClass->setAccessible(true);
+        $this->assertEquals(
+            $expectedClass->getValue($model)['ThirdClassForParentCall'],
+            $model->getParents('ThirdClassForParentCall')
+        );
+    }
+
+    /**
+     * Data provider
+     *
+     * @return array
+     */
+    public function getTestData()
+    {
+        return
+            [
+                [
+                    [
+                        0 => [
+                            0 => 'stdClassObject',
+                            1 => 'stdClass',
+                            2 => true,
+                            3 => null,
+                        ],
+                        1 => [
+                            0 => 'runeTimeException',
+                            1 => 'ClassExtendsDefaultPhpType',
+                            2 => true,
+                            3 => null,
+                        ],
+                        2 => [
+                            0 => 'arrayVariable',
+                            1 => null,
+                            2 => false,
+                            3 => [
+                                'key' => 'value',
+                            ]
+                        ]
+                    ]
+                ]
+            ];
+    }
+}