[Zope-Coders] Testing from an INSTANCE_HOME

[Richard Jones]

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On Sunday, June 8, 2003, at 12:37 AM, Chris Withers wrote:

> Shane Hathaway wrote:
>> What if we just decided that unit tests should not use Zope.app() to 
>> open a database, but rather a new function called Testing.app()? 
>> Testing.app() would return a clean database that unit tests are free 
>> to change.  If all unit tests that use Zope.app() start using 
>> Testing.app() instead, we won't need the custom_zodb.py hack and the 
>> Testing package can leave INSTANCE_HOME alone.
>
> I think this is a fantastic idea :-)
>
> Test that want to be INSTANCE_HOME testable can use Testing.app(), 
> those that don't care or want to maintain backward compatability can 
> do what they're doing now...

We do something like this right now. I'm not completely up to speed 
with the way that our test harness works. I don't know where Stuart got 
the code (he may have written it himself - the comments in the file 
indicate he may have).

We use the following scheme:

# in test file
import testhelpers.zope
app = testhelpers.zope.createDatabase()
# now use app just like Zope.app()


# testhelpers/zope.py
import ZODB,OFS.Application
from ZODB.DemoStorage import DemoStorage
from ZODB.DB import DB

def createDatabase():
     ''' Create a dummy ZODB and install products. Returns a 
OFS.Application '''
     OFS.Application.import_products()
     db = DB(DemoStorage())
     con = db.open()
     root = con.root()
     app = OFS.Application.Application()
     root['Application'] = app
     get_transaction().commit()
     OFS.Application.install_products(app)
     return app
# end testhelpers/zope.py
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