A simple test the make sure image transformations work as expected (also see
http://dev.plone.org/plone/ticket/8506).  First we create an image and check
the dimensions of the image itself and one of the scales:

  >>> self.setRoles(('Manager',))
  >>> data = self.getImage(name='image.jpg')
  >>> portal.invokeFactory('Image', id='foo', title='Foo', image=data)
  'foo'

  >>> image = portal['foo']
  >>> image.width, image.height
  (500, 200)
  >>> traverse = portal.REQUEST.traverseName
  >>> scale = traverse(image, 'image_mini')
  >>> scale.width, scale.height
  (200, 80)

Let's also check a custom scale size:

  >>> iprops = portal.portal_properties.imaging_properties
  >>> iprops.manage_changeProperties(allowed_sizes=
  ...   ['mini 200:200', 'foo 100:100'])
  >>> scale = traverse(image, 'image_foo')
  >>> scale.width, scale.height
  (100, 40)

We use a testbrowser to rotate the image:

  >>> browser = self.getBrowser()
  >>> browser.open('http://nohost/plone')
  >>> browser.getLink('Foo').click()
  >>> browser.getLink('Transform').click()
  >>> browser.getControl(name='method').displayValue = ['Rotate 90 clockwise']
  >>> browser.getControl('Execute').click()

Let's check if the image has been rotated — its dimensions should have
switched due to the 90º rotation:

  >>> image = portal['foo']
  >>> image.width, image.height
  (200, 500)

The same should be true for its scales:

  >>> scale = traverse(image, 'image_mini')
  >>> scale.width, scale.height
  (80, 200)
  >>> scale = traverse(image, 'image_foo')
  >>> scale.width, scale.height
  (40, 100)