drupalPost() and drupalPostAJAX() have been renamed

• In Drupal 7, drupalPost() and drupalPostAJAX() both have deeply embedded assumptions that they're being applied to forms.
• In Drupal 8, we now have POST requests that receive application/json and application/vnd.drupal-ajax responses. (e.g. rendering of AJAXy Views, contextual links, Edit module's metadata, etc.). Hence there is a need to simulate HTTP POST requests that aren't processed by a form controller. These were condemned to use curlExec() directly.
• A new drupalPost() method, with a different signature than Drupal 7 one, has been introduced in Drupal 8 to deal with these requirements.
• The former drupalPost() and drupalPostAJAX() methods have been renamed, while retaining the original arguments:
  • drupalPost() → drupalPostForm()
  • drupalPostAJAX() → drupalPostAjaxForm()

Code example

Before (Drupal 7):

   ...
   $this->drupalPost('admin/config/development/logging', $edit, t('Save configuration'));
   ...

After (Drupal 8):

   ...
  $this->drupalPostForm('admin/config/development/logging', $edit, t('Save configuration'));
   ...