Adding unit test

Author: Bartosz Kubicki

lib/internal/Magento/Framework/Amqp/Test/Unit/Topology/ArgumentProcessorTest.php

@@ -0,0 +1,73 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Framework\Amqp\Test\Unit\Topology;
+
+use InvalidArgumentException;
+use Magento\Framework\Amqp\Topology\ArgumentProcessor;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Class ArgumentProcessorTest
+ */
+class ArgumentProcessorTest extends TestCase
+{
+    /**
+     * @var ArgumentProcessor|MockObject
+     */
+    private $argumentProcessor;
+
+    /**
+     * @return void
+     */
+    public function testProcessArgumentsWhenAnyArgumentIsIncorrect(): void
+    {
+        $arguments = [
+            'test' => new class {
+            }
+        ];
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->argumentProcessor->processArguments($arguments);
+    }
+
+    /**
+     * @return void
+     */
+    public function testProcessArgumentsWhenAllArgumentAreCorrect(): void
+    {
+        $arguments = [
+            'array_type' => ['some_key' => 'some_value'],
+            'numeric_value' => '25',
+            'integer_value' => 26,
+            'boolean_value' => false,
+            'string_value' => 'test'
+        ];
+
+        $expected = [
+            'array_type' => ['A', ['some_key' => 'some_value']],
+            'numeric_value' => ['I', 25],
+            'integer_value' => ['I', 26],
+            'boolean_value' => ['t', false],
+            'string_value' => ['S', 'test']
+        ];
+
+        $this->assertSame($expected, $this->argumentProcessor->processArguments($arguments));
+    }
+
+    /**
+     * @return void
+     */
+    protected function setUp(): void
+    {
+        parent::setUp();
+        $this->argumentProcessor = $this->getMockForTrait(ArgumentProcessor::class);
+    }
+}