Testing Pyramid applications

Talk at Pyramid London about testing Pyramid applications. Doctest, unit testing, integration testing and functional testing all make an appearance.

Transcript

1. Testing Pyramid
   applications
   Pyramid London // James Cooke
   

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2. Pyramid layout
   YourApp
   View
   YourApp
   Code:
   Models
   Forms
   etc
   Templating /
   render
   DB
   FS
   Events
   Routing /
   View Lookup
   WSGI
   App
   View
   callable
   

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3. doctest
   ● Good for:
   ○ Models
   ○ Form schemas
   ○ Basic app logic
   ● Modules:
   ○ from mock import Mock
   ○ SQLAlchemy sessions
   ○ from pyramid.testing import
   DummyRequest
   

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4. doctest
   Pyramid layout
   YourApp
   View
   YourApp
   Code:
   Models
   Forms
   etc
   Templating /
   render
   DB
   FS
   Events
   Routing /
   View Lookup
   WSGI
   App
   View
   callable
   Now with doctest
   request
   response
   

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5. unit test
   ● Good for:
   ○ Basic views
   ○ Models
   ○ Basic app logic
   ● Warning signs:
   ○ Pyramid events
   ○ View needs specific code to be tested
   

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6. unit
   test doctest
   Pyramid layout
   YourApp
   View
   YourApp
   Code:
   Models
   Forms
   etc
   Templating /
   render
   DB
   FS
   Events
   Routing /
   View Lookup
   WSGI
   App
   View
   callable
   Now with doctest and unitest
   

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7. integration test
   ● Good for:
   ○ Views - request in, response out
   ○ Events!
   ○ Real app logic
   ● Warning signs:
   ○ Monolithic tests
   ○ Repeating code
   

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8. integration test
   unit
   test doctest
   Pyramid layout
   YourApp
   View
   YourApp
   Code:
   Models
   Forms
   etc
   Templating /
   render
   DB
   FS
   Events
   Routing /
   View Lookup
   WSGI
   App
   View
   callable
   Now with doctest, unitest, integration test
   

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9. unit / integration tips
   ● Build 'good request'
   ● Make sure events are wired in
   ● Use real database and sessions
   ● Context might not be None
   

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10. wish 1:
    better permission testing
    from pyramid.httpexceptions import HTTPForbidden
    from my.package import view_fn
    self.config.testing_securitypolicy(userid='hank',
    permissive=False)
    request = testing.DummyRequest()
    request.context = testing.DummyResource()
    self.assertRaises(HTTPForbidden, view_fn, request)
    

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11. wish 2:
    Better SQLAlchemy tm
    transaction.manager wrap on views to
    write data when call is finished.
    DetachedInstanceError: Parent instance at 0x3959310> is not bound to a Session;
    lazy load operation of attribute 'roles'
    cannot proceed
    

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12. wish 3:
    Routing - how to test?!
    ● Order of calls to pyramid.config.
    Configurator.add_route() matter
    ● This should be programmatically testable!
    ● Currently request.route_url() and
    check result.
    

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13. functional test
    routing test
    integration test
    unit
    test doctest
    Pyramid layout
    YourApp
    View
    YourApp
    Code:
    Models
    Forms
    etc
    Templating /
    render
    DB
    FS
    Events
    Routing /
    View Lookup
    WSGI
    App
    View
    callable
    

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14. functional tips
    ● Use BDD (behaviour driven development)
    ● behave seems like a good library
    ● Mako rendering exceptions can die
    

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15. functional test
    routing test
    integration test
    unit
    test doctest
    Pyramid testing 100%
    YourApp
    View
    YourApp
    Code:
    Models
    Forms
    etc
    Templating /
    render
    DB
    FS
    Events
    Routing /
    View Lookup
    WSGI
    App
    View
    callable
    

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16. thanks for listening
    ● Any questions?
    ● @jamesfublo
    

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