diff --git a/tests/Unit/Collector/HttpClientInterfaceProxyTest.php b/tests/Unit/Collector/HttpClientInterfaceProxyTest.php
new file mode 100644
index 00000000..188b2c9f
--- /dev/null
+++ b/tests/Unit/Collector/HttpClientInterfaceProxyTest.php
@@ -0,0 +1,37 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Yii\Debug\Tests\Unit\Collector;
+
+use GuzzleHttp\Psr7\Request;
+use GuzzleHttp\Psr7\Response;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Client\ClientInterface;
+use Yiisoft\Yii\Debug\Collector\HttpClientCollector;
+use Yiisoft\Yii\Debug\Collector\HttpClientInterfaceProxy;
+use Yiisoft\Yii\Debug\Collector\TimelineCollector;
+
+final class HttpClientInterfaceProxyTest extends TestCase
+{
+    public function testSendRequest()
+    {
+        $request = new Request('GET', 'http://example.com');
+        $response = new Response(200, [], 'test');
+
+        $client = $this->createMock(ClientInterface::class);
+        $client->expects($this->once())
+            ->method('sendRequest')
+            ->with($request)
+            ->willReturn($response);
+        $collector = new HttpClientCollector(new TimelineCollector());
+        $collector->startup();
+
+        $proxy = new HttpClientInterfaceProxy($client, $collector);
+
+        $newResponse = $proxy->sendRequest($request);
+
+        $this->assertSame($newResponse, $response);
+        $this->assertCount(1, $collector->getCollected());
+    }
+}