function testPush()
{
$ts = TokenStream::fromSource("<?php 1 2 3 ");
$ts->push(new Token(T_LNUMBER, '4'));
$ts->push(new Token(T_WHITESPACE, ' '));
$ts->push(new Token(T_LNUMBER, '5'));
$ts->push(new Token(T_WHITESPACE, ' '));
$this->assertEquals('<?php 1 2 3 4 5 ', (string) $ts);
$ts = TokenStream::fromEmpty();
$ts->push(new Token(T_STRING, 'A'));
$ts->push(new Token(T_WHITESPACE, ' '));
$ts->push(new Token(T_STRING, 'B'));
$ts->push(new Token(T_WHITESPACE, ' '));
$this->assertEquals('A B ', (string) $ts);
$ts->extract($ts->index(), $ts->index()->next->next->next);
$this->assertEquals(' ', (string) $ts);
$ts->push(new Token(T_STRING, 'C'));
$this->assertEquals(' C', (string) $ts);
}
