pytestify 1.0.7

Automatically convert unittests to pytest

pytestify

A tool to automatically change unittest to pytest. Similar to unittest2pytest, but with a few more features and written using AST and tokenize, rather than lib2to3.

Big thanks to pyupgrade, which this project has learned from.

Installation

pip install pytestify

Usage

pytestify path/to/file.py

or

pytestify path/to/folder/

Please read over all changes that pytestify makes. It's a new package, so there are bound to be issues.

Implemented features

Test class names

Remove TestCase parent class, and make sure tests start with Test. We are keeping the test classes themselves, but you can remove them manually.

class TestThing(unittest.TestCase):  # class TestThing:
class TestThing(TestCase, ClassB):   # class TestThing(ClassB):
class ThingTest(unittest.TestCase):  # class TestThing:
class Thing(unittest.TestCase):      # class TestThing:

Setup / teardowns

def setUp(self):          # def setup_method(self):
def tearDown(self):       # def teardown_method(self):
def setUpClass(self):     # def setup_class(self):
def tearDownClass(self):  # def teardown_class(self):

Asserts

Rewrite unittest assert methods using the assert keyword.

# asserting one thing
self.assertTrue(a)       # assert a
self.assertFalse (a)     # assert not a
self.assertIsNone(a)     # assert a is None
self.assertIsNotNone(a)  # assert a is not None

# asserting two things
self.assertEqual(a, b)      # assert a == b
self.assertNotEqual(a, b)   # assert a != b
self.assertIs(a, b)         # assert a is b
self.assertIsNot(a, b)      # assert a is not b
self.assertIn(a, b)         # assert a in b
self.assertNotIn(a, b)      # assert a not in b
self.assertListEqual(a, b)  # assert a == b
self.assertDictEqual(a, b)  # assert a == b
self.assertSetEqual(a, b)   # assert a == b
self.assertItemsEqual(a, b) # assert sorted(a) == sorted(b)
self.assertGreater(a, b)    # assert a > b
self.assertLess(a, b)       # assert a < b
self.assertGreaterEqual(a, b)  # assert a >= b
self.assertLessEqual(a, b)  # assert a <= b
self.assertRegex(a, b)      # assert a.search(b)
self.assertNotRegex(a, b)   # assert not a.search(b)

self.assertAlmostEqual(a, b)
#   assert a == pytest.approx(b)
self.assertAlmostEqual(a, b, places=2)
#   assert a == pytest.approx(b, abs=0.01)

# error messages
self.assertTrue(a, msg='oh no!')  # assert a, 'oh no!'

Note: assertCountEqual is NOT supported here. It is tricky to implement, and pytest has voiced hesitations about including it in the near future. You can still use unittest's implementation.

Multi-line asserts

Since assert (a == b, 'err') is equivalent to asserting a tuple, and thus is always True.

self.assertEqual(    # assert a == \
    a,               #     b
    b,
)

self.assertEqual(    # assert a == \
    a,               #     b, \
    b,               #     'oh no!'
    msg='oh no!'
)

Exceptions

self.assertRaises(OSError)             # pytest.raises(OSError)
self.assertWarns(OSError)              # pytest.warns(OSError)
with self.assertRaises(OSError) as e:  # with pytest.raises(OSError) as e
with self.assertWarns(OSError) as e:   # with pytest.warns(OSError) as e

Skipping / Expecting failure

# decorated
@unittest.skip('some reason')    # @pytest.mark.skip('some reason')
@unittest.skipIf(some_bool)      # @pytest.mark.skipif(some_bool)
@unittest.skipUnless(some_bool)  # @pytest.mark.skipif(not some_bool)
@unittest.expectedFailure        # @pytest.mark.xfail

# not decorated
unittest.skip('some reason')     # pytest.skip('some reason')
unittest.skipTest('some reason') # pytest.skip('some reason')
unittest.fail('some reason')     # pytest.fail('some reason')