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dev/tests/integration/testsuite/Magento/Setup/Module/Dependency/CircularTest.php

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+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento\Setup\Module\Dependency;
+
+class CircularTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var Circular
+     */
+    protected $circular;
+
+    protected function setUp(): void
+    {
+        $this->circular = new Circular();
+    }
+
+    public function testBuildCircularDependencies()
+    {
+        $dependencies = [1 => [2], 2 => [3, 5], 3 => [1], 5 => [2]];
+        $expectedCircularDependencies = [
+            1 => [[1, 2, 3, 1]],
+            2 => [[2, 3, 1, 2], [2, 5, 2]],
+            3 => [[3, 1, 2, 3]],
+            5 => [[5, 2, 5]],
+        ];
+        $this->assertEquals($expectedCircularDependencies, $this->circular->buildCircularDependencies($dependencies));
+    }
+}