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I'm working with moto and Python 3.7 to mock some S3 interaction. It appears that moto is working properly if all of the mocking code is contained in the test method. When I move some of the preliminary code to setUp(), the test fails as if setUp() has never run.

import unittest



import boto3

from moto import mock_s3



class BucketFacadeTests(unittest.TestCase):



    @mock_s3

    def setUp(self):

        print('setUp called')

        s3 = boto3.resource('s3', region_name='us-east-1')

        s3.create_bucket(Bucket='bucket')

        key = 'a/b/c/d.txt'

        object = s3.Object('bucket', key)

        object.put(Body='my dog has fleas')



    def do_test(self):

        s3 = boto3.resource('s3', region_name='us-east-1')

        the_object = s3.Object('bucket', 'a/b/c/d.txt')

        string_data = the_object.get()['Body'].read().decode('utf-8')

        self.assertEqual('my dog has fleas', string_data)



    @mock_s3

    def test_bucket_can_be_accessed_with_setup(self):

        self.do_test()



    @mock_s3

    def test_bucket_can_be_accessed_without_setup(self):

        # This does what setUp() should

        s3 = boto3.resource('s3', region_name='us-east-1')

        s3.create_bucket(Bucket='bucket')

        key = 'a/b/c/d.txt'

        object = s3.Object('bucket', key)

        object.put(Body='my dog has fleas')



        self.do_test()

When I don't rely on setUp(), everything runs as expected

Testing started at 07:49 ...

/Users/paul/.virtualenvs/nui-converter/bin/python "/Applications/PyCharm CE.app/Contents/helpers/pycharm/_jb_unittest_runner.py" --target BucketFacade2Tests.BucketFacadeTests.test_bucket_can_be_accessed_without_setup

Launching unittests with arguments python -m unittest BucketFacade2Tests.BucketFacadeTests.test_bucket_can_be_accessed_without_setup in /Users/Paul/as/nui-converter/tests/InventoryLoader

setUp called





Ran 1 test in 0.103s



OK



Process finished with exit code 0

Yet it fails when I do rely on setUp()

Testing started at 07:56 ...

/Users/paul/.virtualenvs/nui-converter/bin/python "/Applications/PyCharm CE.app/Contents/helpers/pycharm/_jb_unittest_runner.py" --target BucketFacade2Tests.BucketFacadeTests.test_bucket_can_be_accessed_with_setup

Launching unittests with arguments python -m unittest BucketFacade2Tests.BucketFacadeTests.test_bucket_can_be_accessed_with_setup in /Users/Paul/as/nui-converter/tests/InventoryLoader

setUp called





Ran 1 test in 0.183s



FAILED (errors=1)



Error

Traceback (most recent call last):

  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/unittest/case.py", line 59, in testPartExecutor

    yield

  File "/usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/unittest/case.py", line 615, in run

    testMethod()

  File "/Users/paul/.virtualenvs/nui-converter/lib/python3.7/site-packages/moto/core/models.py", line 74, in wrapper

    result = func(*args, **kwargs)

  File "/Users/Paul/as/nui-converter/tests/InventoryLoader/BucketFacade2Tests.py", line 27, in test_bucket_can_be_accessed_with_setup

    self.do_test()

  File "/Users/Paul/as/nui-converter/tests/InventoryLoader/BucketFacade2Tests.py", line 22, in do_test

    string_data = the_object.get()['Body'].read().decode('utf-8')

  File "/Users/paul/.virtualenvs/nui-converter/lib/python3.7/site-packages/boto3/resources/factory.py", line 520, in do_action

    response = action(self, *args, **kwargs)

  File "/Users/paul/.virtualenvs/nui-converter/lib/python3.7/site-packages/boto3/resources/action.py", line 83, in __call__

    response = getattr(parent.meta.client, operation_name)(**params)

  File "/Users/paul/.virtualenvs/nui-converter/lib/python3.7/site-packages/botocore/client.py", line 357, in _api_call

    return self._make_api_call(operation_name, kwargs)

  File "/Users/paul/.virtualenvs/nui-converter/lib/python3.7/site-packages/botocore/client.py", line 661, in _make_api_call

    raise error_class(parsed_response, operation_name)

botocore.errorfactory.NoSuchBucket: An error occurred (NoSuchBucket) when calling the GetObject operation: The specified bucket does not exist





Process finished with exit code 1

Am I doing something wrong or pushing moto beyond its limits?