bslatkin / effectivepython

Effective Python: Second Edition — Source Code and Errata for the Book
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Test on p 375 doesn't work #73

Open hhummel opened 4 years ago

hhummel commented 4 years ago

Test refers to food_func, animals_func and feed_func, but these don't appear in the patch on p 374. Did you mean get_food_period, get_animals and feed_animal?

Even changing those, the assert result == 2 fails, (returning 3), and should be self.assertEqual according to what you say on p 360.

Next I get an assert error: AssertionError: (('', <BoundArguments (database=<object object at 0x7f652955ffb0>, name='Spot', when=datetime.datetime(2019, 6, 5, 15, 45))>), ('', <BoundArguments (database=<object object at 0x7f652955ffb0>, name='Fluffy', when=datetime.datetime(2019, 6, 5, 15, 45))>)) not all found in call list This is where I gave up.

bslatkin commented 4 years ago

Thanks for the report! Yes there are two separate bugs here that I need to fix:

First is in the test assertions, I'm using the wrong mocks, so this is what needs to change:

     result = do_rounds(database, 'Meerkat', utcnow=now_func)
     assert result == 2

-    food_func.assert_called_once_with(database, 'Meerkat')
-    animals_func.assert_called_once_with(database, 'Meerkat')
-    feed_func.assert_has_calls(
+    get_food_period.assert_called_once_with(database, 'Meerkat')
+    get_animals.assert_called_once_with(database, 'Meerkat')
+    feed_animal.assert_has_calls(
         [
             call(database, 'Spot', now_func.return_value),
             call(database, 'Fluffy', now_func.return_value),

And once that's fixed, the example still fails because there's a typo in the later version of do_rounds that doesn't have as many keyword arguments. That needs to change like this:

     for name, last_mealtime in animals:
         if (now - last_mealtime) > feeding_timedelta:
-            feed_func(database, name, now)
+            feed_animal(database, name, now)
             fed += 1
hhummel commented 4 years ago

Thanks for following up! Big fan

On Sun, May 24, 2020 at 5:28 PM Brett Slatkin notifications@github.com wrote:

Thanks for the report! Yes there are two separate bugs here that I need to fix:

First is in the test assertions, I'm using the wrong mocks, so this is what needs to change:

 result = do_rounds(database, 'Meerkat', utcnow=now_func)
 assert result == 2
  • food_func.assert_called_once_with(database, 'Meerkat')
  • animals_func.assert_called_once_with(database, 'Meerkat')
  • feed_func.assert_has_calls(
  • get_food_period.assert_called_once_with(database, 'Meerkat')
  • get_animals.assert_called_once_with(database, 'Meerkat')
  • feed_animal.assert_has_calls( [ call(database, 'Spot', now_func.return_value), call(database, 'Fluffy', now_func.return_value),

And once that's fixed, the example still fails because there's a typo in the later version of do_rounds that doesn't have as many keyword arguments. That needs to change like this:

 for name, last_mealtime in animals:
     if (now - last_mealtime) > feeding_timedelta:
  • feed_func(database, name, now)
  • feed_animal(database, name, now) fed += 1

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