test: add unit tests for ECSConfig and RectorConfig classes

Signed-off-by: Felipe Sayão Lobato Abreu <github@mentordosnerds.com>

Author: coisa

tests/Config/ECSConfigTest.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of fast-forward/dev-tools.
+ *
+ * This source file is subject to the license bundled
+ * with this source code in the file LICENSE.
+ *
+ * @copyright Copyright (c) 2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com>
+ * @license   https://opensource.org/licenses/MIT MIT License
+ *
+ * @see       https://github.com/php-fast-forward/dev-tools
+ * @see       https://github.com/php-fast-forward
+ * @see       https://datatracker.ietf.org/doc/html/rfc2119
+ */
+
+namespace FastForward\DevTools\Tests\Config;
+
+use FastForward\DevTools\Config\ECSConfig;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+use Symplify\EasyCodingStandard\Configuration\ECSConfigBuilder;
+
+#[CoversClass(ECSConfig::class)]
+final class ECSConfigTest extends TestCase
+{
+    /**
+     * @return void
+     */
+    #[Test]
+    public function configureWillReturnECSConfigBuilder(): void
+    {
+        $result = ECSConfig::configure();
+
+        self::assertInstanceOf(ECSConfigBuilder::class, $result);
+    }
+}

tests/Config/RectorConfigTest.php

@@ -0,0 +1,54 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of fast-forward/dev-tools.
+ *
+ * This source file is subject to the license bundled
+ * with this source code in the file LICENSE.
+ *
+ * @copyright Copyright (c) 2026 Felipe Sayão Lobato Abreu <github@mentordosnerds.com>
+ * @license   https://opensource.org/licenses/MIT MIT License
+ *
+ * @see       https://github.com/php-fast-forward/dev-tools
+ * @see       https://github.com/php-fast-forward
+ * @see       https://datatracker.ietf.org/doc/html/rfc2119
+ */
+
+namespace FastForward\DevTools\Tests\Config;
+
+use FastForward\DevTools\Config\RectorConfig;
+use PHPUnit\Framework\Attributes\CoversClass;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+
+#[CoversClass(RectorConfig::class)]
+final class RectorConfigTest extends TestCase
+{
+    /**
+     * @return void
+     */
+    #[Test]
+    public function configureWillReturnCallable(): void
+    {
+        $result = RectorConfig::configure();
+
+        self::assertIsCallable($result);
+    }
+
+    /**
+     * @return void
+     */
+    #[Test]
+    public function configureWithCustomCallbackWillReturnCallable(): void
+    {
+        $customCallback = static function ($config): void {
+            \assert($config instanceof \Rector\Config\RectorConfig);
+        };
+
+        $result = RectorConfig::configure($customCallback);
+
+        self::assertIsCallable($result);
+    }
+}