add test for AsyncLoopBuilder

tests/Lib/Loop/AsyncLoopBuilderTest.php

@@ -0,0 +1,47 @@
+<?php
+
+/**
+ * This file is part of the sj-i/php-profiler package.
+ *
+ * (c) sji <sji@sj-i.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace PhpProfiler\Lib\Loop;
+
+use PhpProfiler\Lib\Loop\AsyncLoopMiddleware\CallableMiddlewareAsync;
+use PHPUnit\Framework\TestCase;
+
+class AsyncLoopBuilderTest extends TestCase
+{
+    public function testBuild(): void
+    {
+        $builder = new AsyncLoopBuilder();
+        $new_builder = $builder->addProcess(CallableMiddlewareAsync::class, [
+            function () {
+                yield 1;
+                yield 2;
+                yield 3;
+            }
+        ]);
+        $loop = $new_builder->build();
+        $result = $loop->invoke();
+        $this->assertSame(1, $result->current());
+        $result->next();
+        $this->assertSame(2, $result->current());
+        $result->next();
+        $this->assertSame(3, $result->current());
+        $result->next();
+        $this->assertSame(1, $result->current());
+        $result->next();
+        $this->assertSame(2, $result->current());
+        $result->next();
+        $this->assertSame(3, $result->current());
+
+        $this->assertNotSame($builder, $new_builder);
+    }
+}