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diff --git a/tests/src/WorkerInterface.php b/tests/src/WorkerInterface.php
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+++ b/tests/src/WorkerInterface.php
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+<?php
+
+/**
+ * High-performance PHP process supervisor and load balancer written in Go.
+ *
+ * @author Wolfy-J
+ */
+
+declare(strict_types=1);
+
+namespace Spiral\RoadRunner;
+
+use Spiral\Goridge\Exception\GoridgeException;
+use Spiral\RoadRunner\Exception\RoadRunnerException;
+
+interface WorkerInterface
+{
+    /**
+     * Wait for incoming payload from the server. Must return null when worker stopped.
+     *
+     * @return Payload|null
+     * @throws GoridgeException
+     * @throws RoadRunnerException
+     */
+    public function waitPayload(): ?Payload;
+
+    /**
+     * Respond to the server with the processing result.
+     *
+     * @param Payload $payload
+     * @throws GoridgeException
+     */
+    public function respond(Payload $payload): void;
+
+    /**
+     * Respond to the server with an error. Error must be treated as TaskError and might not cause
+     * worker destruction.
+     *
+     * Example:
+     *
+     * $worker->error("invalid payload");
+     *
+     * @param string $error
+     * @throws GoridgeException
+     */
+    public function error(string $error): void;
+
+    /**
+     * Terminate the process. Server must automatically pass task to the next available process.
+     * Worker will receive stop command after calling this method.
+     *
+     * Attention, you MUST use continue; after invoking this method to let rr to properly stop worker.
+     */
+    public function stop(): void;
+}