Asserts parameter key value pair exist.


| Parse URL        | http://jspringbot.org/search.html?a=0&b=hello&c=world&d=goodbye&e=https://myhomepage.com&a=1 |                        |
| Assert Parameter | a                                                                                            | 0                      |
| Assert Parameter | a                                                                                            | 1                      |
| Assert Parameter | b                                                                                            | hello                  |
| Assert Parameter | c                                                                                            | world                  |
| Assert Parameter | e                                                                                            | https://myhomepage.com |