1 | """ |
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2 | This module has been ported to Python 3. |
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3 | """ |
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4 | |
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5 | import sys |
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6 | import random |
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7 | |
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8 | from hypothesis import given |
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9 | from hypothesis.strategies import lists, sampled_from |
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10 | from testtools.matchers import Equals |
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11 | from twisted.python.reflect import ( |
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12 | ModuleNotFound, |
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13 | namedAny, |
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14 | ) |
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15 | |
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16 | from .common import ( |
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17 | SyncTestCase, |
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18 | disable_modules, |
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19 | ) |
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20 | from allmydata.test.common_util import flip_one_bit |
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21 | |
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22 | |
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23 | class TestFlipOneBit(SyncTestCase): |
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24 | |
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25 | def setUp(self): |
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26 | super(TestFlipOneBit, self).setUp() |
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27 | # I tried using version=1 on PY3 to avoid the if below, to no avail. |
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28 | random.seed(42) |
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29 | |
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30 | def test_accepts_byte_string(self): |
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31 | actual = flip_one_bit(b'foo') |
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32 | self.assertEqual(actual, b'fom') |
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33 | |
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34 | def test_rejects_unicode_string(self): |
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35 | self.assertRaises(AssertionError, flip_one_bit, u'foo') |
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36 | |
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37 | |
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38 | |
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39 | def some_existing_modules(): |
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40 | """ |
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41 | Build the names of modules (as native strings) that exist and can be |
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42 | imported. |
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43 | """ |
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44 | candidates = sorted( |
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45 | name |
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46 | for name |
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47 | in sys.modules |
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48 | if "." not in name |
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49 | and sys.modules[name] is not None |
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50 | ) |
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51 | return sampled_from(candidates) |
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52 | |
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53 | class DisableModulesTests(SyncTestCase): |
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54 | """ |
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55 | Tests for ``disable_modules``. |
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56 | """ |
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57 | def setup_example(self): |
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58 | return sys.modules.copy() |
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59 | |
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60 | def teardown_example(self, safe_modules): |
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61 | sys.modules.update(safe_modules) |
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62 | |
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63 | @given(lists(some_existing_modules(), unique=True)) |
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64 | def test_importerror(self, module_names): |
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65 | """ |
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66 | While the ``disable_modules`` context manager is active any import of the |
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67 | modules identified by the names passed to it result in ``ImportError`` |
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68 | being raised. |
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69 | """ |
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70 | def get_modules(): |
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71 | return list( |
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72 | namedAny(name) |
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73 | for name |
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74 | in module_names |
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75 | ) |
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76 | before_modules = get_modules() |
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77 | |
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78 | with disable_modules(*module_names): |
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79 | for name in module_names: |
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80 | with self.assertRaises(ModuleNotFound): |
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81 | namedAny(name) |
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82 | |
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83 | after_modules = get_modules() |
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84 | self.assertThat(before_modules, Equals(after_modules)) |
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85 | |
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86 | def test_dotted_names_rejected(self): |
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87 | """ |
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88 | If names with "." in them are passed to ``disable_modules`` then |
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89 | ``ValueError`` is raised. |
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90 | """ |
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91 | with self.assertRaises(ValueError): |
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92 | with disable_modules("foo.bar"): |
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93 | pass |
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