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Test to ensure the right controlpanel is available for Left Skin Theme vs Other Themes
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Create the browser object we'll be using.

    >>> from Products.Five.testbrowser import Browser
    >>> browser = Browser()
    >>> portal_url = self.portal.absolute_url()
    >>> browser.open(portal_url)

Login as an admin

    >>> self.setRoles(['Manager',])
    >>> self.portal.portal_membership.addMember('manager','secret',('Manager',),())
    >>> browser.getLink('Log in').click()
    >>> browser.getControl('Login Name').value = 'manager'
    >>> browser.getControl('Password').value = 'secret'
    >>> browser.getControl('Log in').click()
    >>> browser.open(portal_url)

Check for Left Skin CSS Helper

    >>> browser.getLink('Site Setup').click()
    >>> 'Left Skin CSS Settings' in browser.contents
    True
    >>> 'CSS Helper' in browser.contents
    True

Change theme to Plone Default

    >>> browser.getLink('Themes').click()
    >>> browser.getControl('Default theme').value = ('Plone Default',)
    >>> browser.getControl('Save').click()
    >>> browser.getLink('Site Setup').click()
    >>> 'Left Skin CSS Settings' in browser.contents
    False
    >>> 'CSS Helper' in browser.contents
    True


