Package: affinitic.verifyinterface
IntroductionWhat’s the use to declare an interface if your class doesn’t implement correctly the interface ?Of course you should verify that in a test but if you don’t want to write a test to check that all your code really implements the promised interfaces use this package.It’s a simple patch that callszope.interface.verify.verifyClassonce you declare implementing an
interface and print the BrokenImplementation or BrokenMethodImplementation as a warning (if any).Simple example in testrunner:By default the egg enable interface contract verification forzope.interface.implementsandzope.interface.classImplementsthat are present in all your packages:>>> write('buildout.cfg',
... """
... [buildout]
... parts =
...     test
...
... [test]
... recipe = zc.recipe.testrunner
... eggs = affinitic.verifyinterface
...        zope.exceptions
... defaults = ['-m', 'module']
... """)

>>> print system(buildout)
Installing test.
...

>>> from os.path import join
>>> print system(join('bin', 'test')),
<class 'affinitic.verifyinterface.tests.test_module1.Foo'> failed implementing <InterfaceClass affinitic.verifyinterface.tests.test_module1.IFoo>: An object has failed to implement interface <InterfaceClass affinitic.verifyinterface.tests.test_module1.IFoo>
<BLANKLINE>
        The bla attribute was not provided.
<BLANKLINE>
<class 'affinitic.verifyinterface.tests.test_module2.Bar'> failed implementing <InterfaceClass affinitic.verifyinterface.tests.test_module2.IBar>: An object has failed to implement interface <InterfaceClass affinitic.verifyinterface.tests.test_module2.IBar>
<BLANKLINE>
        The bla attribute was not provided.
<BLANKLINE>
Running zope.testing.testrunner.layer.UnitTests tests:
  Set up zope.testing.testrunner.layer.UnitTests in 0.000 seconds.
  Ran 2 tests with 0 failures and 0 errors in 0.000 seconds.
Tearing down left over layers:
  Tear down zope.testing.testrunner.layer.UnitTests in 0.000 seconds.Limit verificationsBut you can limit the package where this verification needs to be done (sometimes you don’t care that
a package you depend on didn’t implement correctly an interface).This is done by adding an environment variableverifyinterfacewhere you specify what packages/modules (separated by n as usual) you accept to verify interfaces.Here is a simple example where I only want to have warning for bad implementation of interfaces used by module1:>>> write('buildout.cfg',
... """
... [buildout]
... parts =
...     test
...
... [test]
... recipe = zc.recipe.testrunner
... eggs = affinitic.verifyinterface
...        zope.exceptions
... defaults = ['-m', 'module']
... environment = testenv
...
... [testenv]
... verifyinterface = affinitic.verifyinterface.tests.test_module1
... """)

>>> print system(buildout)
Uninstalling test.
Installing test.
...

>>> from os.path import join
>>> print system(join('bin', 'test'))
<class 'affinitic.verifyinterface.tests.test_module1.Foo'> failed implementing <InterfaceClass affinitic.verifyinterface.tests.test_module1.IFoo>: An object has failed to implement interface <InterfaceClass affinitic.verifyinterface.tests.test_module1.IFoo>
<BLANKLINE>
        The bla attribute was not provided.
<BLANKLINE>
Running zope.testing.testrunner.layer.UnitTests tests:
  Set up zope.testing.testrunner.layer.UnitTests in 0.000 seconds.
  Ran 2 tests with 0 failures and 0 errors in 0.000 seconds.
Tearing down left over layers:
  Tear down zope.testing.testrunner.layer.UnitTests in 0.000 seconds.Changelog0.1 (2009-12-18)Initial release