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vendor/symfony/dependency-injection/Tests/Argument/RewindableGeneratorTest.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Tests\Argument;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+
+class RewindableGeneratorTest extends TestCase
+{
+    public function testImplementsCountable()
+    {
+        $this->assertInstanceOf(\Countable::class, new RewindableGenerator(function () {
+            yield 1;
+        }, 1));
+    }
+
+    public function testCountUsesProvidedValue()
+    {
+        $generator = new RewindableGenerator(function () {
+            yield 1;
+        }, 3);
+
+        $this->assertCount(3, $generator);
+    }
+
+    public function testCountUsesProvidedValueAsCallback()
+    {
+        $called = 0;
+        $generator = new RewindableGenerator(function () {
+            yield 1;
+        }, function () use (&$called) {
+            ++$called;
+
+            return 3;
+        });
+
+        $this->assertSame(0, $called, 'Count callback is called lazily');
+        $this->assertCount(3, $generator);
+
+        \count($generator);
+
+        $this->assertSame(1, $called, 'Count callback is called only once');
+    }
+}