public function testMultiplications()
{
$converter = new InfixToRPNconverter();
$formula = '2*3*2';
$result = $converter->convert($formula);
$expected = array('2', '3', '*', '2', '*');
$this->assertEquals(implode('', $expected), implode('', $result));
$formula = '2*3*2-1';
$result = $converter->convert($formula);
$expected = array('2', '3', '*', '2', '*', '1', '-');
$this->assertEquals(implode('', $expected), implode('', $result));
$formula = '1+2*3*2';
$result = $converter->convert($formula);
$expected = array('1', '2', '3', '*', '2', '*', '+');
$this->assertEquals(implode('', $expected), implode('', $result));
}
private function preparePostfixNotation()
{
$converter = new InfixToRPNconverter();
return $converter->convert($this->formula);
}