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        <textarea name='content' rows='20' cols='100'>&lt;?php

namespace GuzzleHttp\Tests\Psr7;

use GuzzleHttp\Psr7;
use GuzzleHttp\Psr7\FnStream;

/**
 * @covers GuzzleHttp\Psr7\FnStream
 */
class FnStreamTest extends BaseTest
{
    public function testThrowsWhenNotImplemented()
    {
        $this-&gt;expectExceptionGuzzle('BadMethodCallException', 'seek() is not implemented in the FnStream');

        (new FnStream([]))-&gt;seek(1);
    }

    public function testProxiesToFunction()
    {
        $s = new FnStream([
            'read' =&gt; function ($len) {
                $this-&gt;assertSame(3, $len);
                return 'foo';
            }
        ]);

        self::assertSame('foo', $s-&gt;read(3));
    }

    public function testCanCloseOnDestruct()
    {
        $called = false;
        $s = new FnStream([
            'close' =&gt; function () use (&amp;$called) {
                $called = true;
            }
        ]);
        unset($s);
        self::assertTrue($called);
    }

    public function testDoesNotRequireClose()
    {
        $s = new FnStream([]);
        unset($s);
        self::assertTrue(true); // strict mode requires an assertion
    }

    public function testDecoratesStream()
    {
        $a = Psr7\Utils::streamFor('foo');
        $b = FnStream::decorate($a, []);
        self::assertSame(3, $b-&gt;getSize());
        self::assertSame($b-&gt;isWritable(), true);
        self::assertSame($b-&gt;isReadable(), true);
        self::assertSame($b-&gt;isSeekable(), true);
        self::assertSame($b-&gt;read(3), 'foo');
        self::assertSame($b-&gt;tell(), 3);
        self::assertSame($a-&gt;tell(), 3);
        self::assertSame('', $a-&gt;read(1));
        self::assertSame($b-&gt;eof(), true);
        self::assertSame($a-&gt;eof(), true);
        $b-&gt;seek(0);
        self::assertSame('foo', (string) $b);
        $b-&gt;seek(0);
        self::assertSame('foo', $b-&gt;getContents());
        self::assertSame($a-&gt;getMetadata(), $b-&gt;getMetadata());
        $b-&gt;seek(0, SEEK_END);
        $b-&gt;write('bar');
        self::assertSame('foobar', (string) $b);
        $this-&gt;assertInternalTypeGuzzle('resource', $b-&gt;detach());
        $b-&gt;close();
    }

    public function testDecoratesWithCustomizations()
    {
        $called = false;
        $a = Psr7\Utils::streamFor('foo');
        $b = FnStream::decorate($a, [
            'read' =&gt; function ($len) use (&amp;$called, $a) {
                $called = true;
                return $a-&gt;read($len);
            }
        ]);
        self::assertSame('foo', $b-&gt;read(3));
        self::assertTrue($called);
    }

    public function testDoNotAllowUnserialization()
    {
        $a = new FnStream([]);
        $b = serialize($a);
        $this-&gt;expectExceptionGuzzle('\LogicException', 'FnStream should never be unserialized');
        unserialize($b);
    }
}
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