Steven D'Aprano wrote:
I have a convention when writing unit tests to put the target of the test
into a class attribute, as follows:
class MyTest(unittest.TestCase):
target = mymodule.someclass
def test_spam(self):
"""Test that someclass has a spam attribute."""
self.failUnless(hasattr(self.target, 'spam'))
It works well until I write a test for stand-alone functions:
class AnotherTest(unittest.TestCase):
target = mymodule.function
def test_foo(self):
self.assertEquals(self.target('a', 'b'), 'foo')
The problem is that target is turned into a method of my test class, not
a standalone function, and I get errors like:
TypeError: function() takes exactly 2 arguments (3 given)
The solution I currently use is to drop the target attribute in this
class, and just refer to mymodule.function in each individual test. I
don't like this solution because it violates Once And Only Once: if the
function changes name, I have to make many edits to the test suite rather
than just one.
Are there any better solutions?
It looks like it works when declaring foo as static:
import unittest
def foo(a,b):
return 'fooo'
class AnotherTest(unittest.TestCase):
target = staticmethod(foo)
def test_foo(self):
self.assertEquals(self.target('a', 'b'), 'foo')
def runTest(self):
self.test_foo()
AnotherTest().runTest()
...AssertionError: 'fooo' != 'foo'
JM
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