Fixed dummy runTest on functional test case. [2.13] #89
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In functional doc tests you can apparently have a test case that has no runTest method. Until now the Testing package added a dummy runTest method in that case, and set it to None.
But when this dummy runTest method gets called, you get an error:
Simply importing Testing.ZopeTestCase.FunctionalTestCase in a new test file may be enough to trigger this.
So this has something to do with the order in which tests are found.
I fixed it by making the dummy runTest method callable.
This is related to remarks in #88, which is where I took this commit from.