fix EventMapIterator bug and add tests

tests/ZM/Event/EventMapIteratorTest.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\ZM\Event;
+
+use Module\Example\Hello;
+use PHPUnit\Framework\TestCase;
+use ZM\Annotation\CQ\CommandArgument;
+use ZM\Console\Console;
+use ZM\Event\EventMapIterator;
+
+/**
+ * @internal
+ */
+class EventMapIteratorTest extends TestCase
+{
+    public function testIterator(): void
+    {
+        Console::setLevel(4);
+        $iterator = new EventMapIterator(Hello::class, 'randNum', CommandArgument::class);
+        $arr = iterator_to_array($iterator);
+        $this->assertArrayNotHasKey(0, $arr);
+        $this->assertArrayNotHasKey(1, $arr);
+        $this->assertArrayHasKey(2, $arr);
+        $this->assertArrayHasKey(3, $arr);
+        $this->assertInstanceOf(CommandArgument::class, $arr[2]);
+        $this->assertInstanceOf(CommandArgument::class, $arr[3]);
+        $iterator = new EventMapIterator(Hello::class, 'closeUnknownConn', CommandArgument::class);
+        $ls = iterator_to_array($iterator);
+        $this->assertCount(0, $ls);
+    }
+}