Swift_CharacterStream_ArrayCharacterStream::setPointer PHP Méthode

    public function setPointer($charOffset)
    {
        if ($charOffset > $this->_array_size) {
            $charOffset = $this->_array_size;
        } elseif ($charOffset < 0) {
            $charOffset = 0;
        }
        $this->_offset = $charOffset;
    }

 public function testPointerOffsetCanBeSet()
 {
     $reader = $this->_getReader();
     $factory = $this->_getFactory($reader);
     $stream = new Swift_CharacterStream_ArrayCharacterStream($factory, 'utf-8');
     $seq = $this->_mockery()->sequence('read-sequence');
     $this->_checking(Expectations::create()->ignoring($reader)->getInitialByteSize()->returns(1)->one($reader)->validateByteSequence(array(0xd0), 1)->inSequence($seq)->returns(1)->one($reader)->validateByteSequence(array(0xd0), 1)->inSequence($seq)->returns(1)->one($reader)->validateByteSequence(array(0xd0), 1)->inSequence($seq)->returns(1));
     $stream->importString(pack('C*', 0xd0, 0x94, 0xd0, 0xb6, 0xd0, 0xbe));
     $this->assertIdenticalBinary(pack('C*', 0xd0, 0x94), $stream->read(1));
     $stream->setPointer(0);
     $this->assertIdenticalBinary(pack('C*', 0xd0, 0x94), $stream->read(1));
     $stream->setPointer(2);
     $this->assertIdenticalBinary(pack('C*', 0xd0, 0xbe), $stream->read(1));
 }