!1 Login Page
login page has:
 * a ''username'' textbox
 * a ''password'' textbox
 * a ''login'' button, to perform authentication
 * a ''next'' button, to go to next page
(start application)
!| ActionFixture |
| start | LoginPage |

login page behaviour:
 * ''login'' and ''next'' buttons are disabled by default
!| LoginPage |
| check | login button is | disabled |
| check | next button is | disabled |

 * ''login'' is set enabled only when both username and password are given
!| LoginPage |
| enter | username | bob |
| check | login button is | disabled |
| enter | password | bob |
| check | login button is | enabled |

 * when authentication succeeds, view set ''login'' button disabled and ''next'' button enabled
!| LoginPage |
| press | login button |
| check | login button is | disabled |
| check | next button is | enabled |
