diff --git a/composer.json b/composer.json
index b4ab9ef..a12abe6 100644
--- a/composer.json
+++ b/composer.json
@@ -15,5 +15,8 @@
             "email": "email@sharkk.net"
         }
     ],
-    "minimum-stability": "stable"
+    "minimum-stability": "stable",
+    "require-dev": {
+        "phpunit/phpunit": "^11.5"
+    }
 }
diff --git a/tests/SegmentRouterTest.php b/tests/SegmentRouterTest.php
new file mode 100644
index 0000000..e430bde
--- /dev/null
+++ b/tests/SegmentRouterTest.php
@@ -0,0 +1,84 @@
+<?php declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+use Sharkk\Router\SegmentRouter;
+
+final class SegmentRouterTest extends TestCase
+{
+    private SegmentRouter $router;
+
+    protected function setUp(): void
+    {
+        $this->router = new SegmentRouter();
+    }
+
+    public function testAddAndLookupRoute(): void
+    {
+        $routes = [];
+        SegmentRouter::add($routes, 'GET', '/blog/:id', function($id) {
+            return "Blog post $id";
+        });
+
+        $result = SegmentRouter::lookup($routes, 'GET', '/blog/123');
+        $this->assertEquals(200, $result['code']);
+        $this->assertIsCallable($result['handler']);
+        $this->assertEquals(['123'], $result['params']);
+        $this->assertEquals("Blog post 123", $result['handler'](...$result['params']));
+    }
+
+    public function testLookupNotFound(): void
+    {
+        $routes = [];
+        SegmentRouter::add($routes, 'GET', '/blog/:id', function($id) {
+            return "Blog post $id";
+        });
+
+        $result = SegmentRouter::lookup($routes, 'GET', '/nonexistent');
+        $this->assertEquals(404, $result['code']);
+        $this->assertNull($result['handler']);
+        $this->assertEmpty($result['params']);
+    }
+
+    public function testMethodNotAllowed(): void
+    {
+        $routes = [];
+        SegmentRouter::add($routes, 'GET', '/blog/:id', function($id) {
+            return "Blog post $id";
+        });
+
+        $result = SegmentRouter::lookup($routes, 'POST', '/blog/123');
+        $this->assertEquals(405, $result['code']);
+        $this->assertNull($result['handler']);
+        $this->assertEmpty($result['params']);
+    }
+
+    public function testClearRoutes(): void
+    {
+        $routes = [];
+        SegmentRouter::add($routes, 'GET', '/blog/:id', function($id) {
+            return "Blog post $id";
+        });
+
+        SegmentRouter::clear($routes);
+        $this->assertEmpty($routes);
+    }
+
+    public function testAddMultipleMethods(): void
+    {
+        $routes = [];
+        SegmentRouter::add($routes, 'GET', '/blog/:id', function($id) {
+            return "GET Blog post $id";
+        });
+        SegmentRouter::add($routes, 'POST', '/blog/:id', function($id) {
+            return "POST Blog post $id";
+        });
+
+        $resultGet = SegmentRouter::lookup($routes, 'GET', '/blog/123');
+        $this->assertEquals(200, $resultGet['code']);
+        $this->assertEquals("GET Blog post 123", $resultGet['handler'](...$resultGet['params']));
+
+        $resultPost = SegmentRouter::lookup($routes, 'POST', '/blog/123');
+        $this->assertEquals(200, $resultPost['code']);
+        $this->assertEquals("POST Blog post 123", $resultPost['handler'](...$resultPost['params']));
+    }
+}
\ No newline at end of file
diff --git a/tests/test.php b/tests/test.php
index f6c08c0..3c0f945 100644
--- a/tests/test.php
+++ b/tests/test.php
@@ -70,7 +70,11 @@ $testRoutes = [
     }],
 ];
 
-array_walk($testRoutes, fn($route) => SegmentRouter::add($routes, $route[0], $route[1], $route[2]));
+$routes = array_map(function($route) use (&$routes) {
+	[$method, $path, $handler] = $route;
+	SegmentRouter::add($routes, $method, $path, $handler);
+	return [$method, $path, $handler];
+}, $testRoutes);
 
 
 for ($i = 0; $i < 10; $i++) {