public function testCanDetermineSizeFromMultipleStreams()
{
$a = new AppendStream(array(Psr7\stream_for('foo'), Psr7\stream_for('bar')));
$this->assertEquals(6, $a->getSize());
$s = $this->getMockBuilder('Psr\\Http\\Message\\StreamInterface')->setMethods(array('isSeekable', 'isReadable'))->getMockForAbstractClass();
$s->expects($this->once())->method('isSeekable')->will($this->returnValue(null));
$s->expects($this->once())->method('isReadable')->will($this->returnValue(true));
$a->addStream($s);
$this->assertNull($a->getSize());
}
