Form can now be submitted

[markhuot]

You can now interact with basic forms during your tests. For pages with a single form you may call ->fill()->submit() to make a nested request at the form's action.

Under the hood this uses the symfony/dom-crawler Form class and has functionality to fill in inputs, check checkboxes, select options from a select box, and click buttons.

The submission response is returned from the submit method and can be chained on to an existing test.

it('tests forms')
  ->get('/search')
  ->assertOk()
  ->fill('search', 'keyword')
  ->submit()
  ->assertOk()
  ->assertSee('102 Search results');