Extract ProducerTest from NsqTest

tests/ProducerTest.php

@@ -0,0 +1,30 @@
+<?php
+
+declare(strict_types=1);
+
+use Nsq\Producer;
+use PHPUnit\Framework\TestCase;
+
+final class ProducerTest extends TestCase
+{
+    /**
+     * @dataProvider pubFails
+     */
+    public function testPubFail(string $topic, string $body, string $exceptionMessage): void
+    {
+        $this->expectException(Exception::class);
+        $this->expectExceptionMessage($exceptionMessage);
+
+        $producer = new Producer('tcp://localhost:4150');
+        $producer->pub($topic, $body);
+    }
+
+    /**
+     * @return Generator<string, array>
+     */
+    public function pubFails(): Generator
+    {
+        yield 'Empty body' => ['test', '', 'E_BAD_MESSAGE PUB invalid message body size 0'];
+        yield 'Invalid topic' => ['test$%^&', '', 'E_BAD_TOPIC PUB topic name "test$%^&" is not valid'];
+    }
+}