public function testSeeksToPositionByReading()
{
$a = new AppendStream(array(Psr7\stream_for('foo'), Psr7\stream_for('bar'), Psr7\stream_for('baz')));
$a->seek(3);
$this->assertEquals(3, $a->tell());
$this->assertEquals('bar', $a->read(3));
$a->seek(6);
$this->assertEquals(6, $a->tell());
$this->assertEquals('baz', $a->read(3));
}
