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

    public function testCopiesToString()
    {
        $s = Psr7\stream_for('foobaz');
        $this->assertEquals('foobaz', Psr7\copy_to_string($s));
        $s->seek(0);
        $this->assertEquals('foo', Psr7\copy_to_string($s, 3));
        $this->assertEquals('baz', Psr7\copy_to_string($s, 3));
        $this->assertEquals('', Psr7\copy_to_string($s));
    }