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Add example of iterator in non-parameterized decorator #164

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21 changes: 21 additions & 0 deletions README.rst
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Expand Up @@ -334,6 +334,27 @@ into memory before the start of the test run (we do this explicitly to ensure
that generators are exhausted exactly once in multi-process or multi-threaded
testing environments).

This also applies to iterators or generators in other decorators. For example,
the following works for the first run but not the second:

.. code:: python

@parameterized.expand([('first run',), ('second run',)])
@mock.patch.object(MyIterator, 'get_iterator', new=mock.Mock(
return_value=iter([1])))
def test_foo(self, bar):
...

Workaround:

.. code:: python

@parameterized.expand([('first run',), ('second run',)])
@mock.patch.object(MyIterator, 'get_iterator')
def test_foo(self, bar, mock_get_iterator):
mock_get_iterator.return_value = iter([1])
...

The ``@parameterized`` decorator can be used test class methods, and standalone
functions:

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