TTW Template Tests
------------------
First we create a simple TTWViewTemplate object and then we obtain a
renderer by calling as if it were a view factory:
>>> from five.customerize.zpt import TTWViewTemplate
>>> template = TTWViewTemplate('test_template', '<html></html>')
>>> template = template.__of__(app)
>>> renderer = template(self.folder, None)
>>> print renderer()
<html></html>
We now add some more complex TAL expressions to our template, and
ensure that it obtains the passed in request and context for rendering:
>>> template.pt_edit('''\
... <span tal:replace="context/getId"/>
... <span tal:replace="request/foo"/>
... <span tal:replace="python:repr(view)"/>''', 'text/html')
>>> from zope.publisher.browser import TestRequest
>>> request = TestRequest(environ={'foo': 'bar'})
>>> renderer = template(self.folder, request)
>>> print renderer()
test_folder_1_
bar
None