public function testTokens()
    {
        $string = new PyStringNode();
        $string->addLine('Hello, <username>');
        $string->addLine('everything is <status>?');
        $string1 = $string->createExampleRowStepArgument(array('username' => 'John', 'status' => 'ok'));
        $this->assertNotSame($string, $string1);
        $this->assertSame(<<<STRING
Hello, John
everything is ok?
STRING
, (string) $string1);
        $string2 = $string->createExampleRowStepArgument(array('username' => 'Mike', 'status' => 'bad'));
        $this->assertNotSame($string, $string2);
        $this->assertSame(<<<STRING
Hello, Mike
everything is bad?
STRING
, (string) $string2);
    }