GuzzleHttp\Tests\Psr7\FunctionsTest::testCopyToStreamReadsInChunksInsteadOfAllInMemory PHP Метод

    public function testCopyToStreamReadsInChunksInsteadOfAllInMemory()
    {
        $sizes = [];
        $s1 = new Psr7\FnStream(['eof' => function () {
            return false;
        }, 'read' => function ($size) use(&$sizes) {
            $sizes[] = $size;
            return str_repeat('.', $size);
        }]);
        $s2 = Psr7\stream_for('');
        Psr7\copy_to_stream($s1, $s2, 16394);
        $s2->seek(0);
        $this->assertEquals(16394, strlen($s2->getContents()));
        $this->assertEquals(8192, $sizes[0]);
        $this->assertEquals(8192, $sizes[1]);
        $this->assertEquals(10, $sizes[2]);
    }