/usr/lib/python3/dist-packages/extras/tests/test_extras.py is in python3-extras 1.0.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 | # Copyright (c) 2010-2012 extras developers. See LICENSE for details.
import sys
import types
from testtools import TestCase
from testtools.matchers import (
Equals,
Is,
Not,
)
from extras import (
safe_hasattr,
try_import,
try_imports,
)
def check_error_callback(test, function, arg, expected_error_count,
expect_result):
"""General test template for error_callback argument.
:param test: Test case instance.
:param function: Either try_import or try_imports.
:param arg: Name or names to import.
:param expected_error_count: Expected number of calls to the callback.
:param expect_result: Boolean for whether a module should
ultimately be returned or not.
"""
cb_calls = []
def cb(e):
test.assertIsInstance(e, ImportError)
cb_calls.append(e)
try:
result = function(arg, error_callback=cb)
except ImportError:
test.assertFalse(expect_result)
else:
if expect_result:
test.assertThat(result, Not(Is(None)))
else:
test.assertThat(result, Is(None))
test.assertEquals(len(cb_calls), expected_error_count)
class TestSafeHasattr(TestCase):
def test_attribute_not_there(self):
class Foo(object):
pass
self.assertEqual(False, safe_hasattr(Foo(), 'anything'))
def test_attribute_there(self):
class Foo(object):
pass
foo = Foo()
foo.attribute = None
self.assertEqual(True, safe_hasattr(foo, 'attribute'))
def test_property_there(self):
class Foo(object):
@property
def attribute(self):
return None
foo = Foo()
self.assertEqual(True, safe_hasattr(foo, 'attribute'))
def test_property_raises(self):
class Foo(object):
@property
def attribute(self):
1/0
foo = Foo()
self.assertRaises(ZeroDivisionError, safe_hasattr, foo, 'attribute')
class TestTryImport(TestCase):
def test_doesnt_exist(self):
# try_import('thing', foo) returns foo if 'thing' doesn't exist.
marker = object()
result = try_import('doesntexist', marker)
self.assertThat(result, Is(marker))
def test_None_is_default_alternative(self):
# try_import('thing') returns None if 'thing' doesn't exist.
result = try_import('doesntexist')
self.assertThat(result, Is(None))
def test_existing_module(self):
# try_import('thing', foo) imports 'thing' and returns it if it's a
# module that exists.
result = try_import('os', object())
import os
self.assertThat(result, Is(os))
def test_existing_submodule(self):
# try_import('thing.another', foo) imports 'thing' and returns it if
# it's a module that exists.
result = try_import('os.path', object())
import os
self.assertThat(result, Is(os.path))
def test_nonexistent_submodule(self):
# try_import('thing.another', foo) imports 'thing' and returns foo if
# 'another' doesn't exist.
marker = object()
result = try_import('os.doesntexist', marker)
self.assertThat(result, Is(marker))
def test_object_from_module(self):
# try_import('thing.object') imports 'thing' and returns
# 'thing.object' if 'thing' is a module and 'object' is not.
result = try_import('os.path.join')
import os
self.assertThat(result, Is(os.path.join))
def test_error_callback(self):
# the error callback is called on failures.
check_error_callback(self, try_import, 'doesntexist', 1, False)
def test_error_callback_missing_module_member(self):
# the error callback is called on failures to find an object
# inside an existing module.
check_error_callback(self, try_import, 'os.nonexistent', 1, False)
def test_error_callback_not_on_success(self):
# the error callback is not called on success.
check_error_callback(self, try_import, 'os.path', 0, True)
def test_handle_partly_imported_name(self):
# try_import('thing.other') when thing.other is mid-import
# used to fail because thing.other is not assigned until thing.other
# finishes its import - but thing.other is accessible via sys.modules.
outer = types.ModuleType("extras.outer")
inner = types.ModuleType("extras.outer.inner")
inner.attribute = object()
self.addCleanup(sys.modules.pop, "extras.outer", None)
self.addCleanup(sys.modules.pop, "extras.outer.inner", None)
sys.modules["extras.outer"] = outer
sys.modules["extras.outer.inner"] = inner
result = try_import("extras.outer.inner.attribute")
self.expectThat(result, Is(inner.attribute))
result = try_import("extras.outer.inner")
self.expectThat(result, Is(inner))
class TestTryImports(TestCase):
def test_doesnt_exist(self):
# try_imports('thing', foo) returns foo if 'thing' doesn't exist.
marker = object()
result = try_imports(['doesntexist'], marker)
self.assertThat(result, Is(marker))
def test_fallback(self):
result = try_imports(['doesntexist', 'os'])
import os
self.assertThat(result, Is(os))
def test_None_is_default_alternative(self):
# try_imports('thing') returns None if 'thing' doesn't exist.
e = self.assertRaises(
ImportError, try_imports, ['doesntexist', 'noreally'])
self.assertThat(
str(e),
Equals("Could not import any of: doesntexist, noreally"))
def test_existing_module(self):
# try_imports('thing', foo) imports 'thing' and returns it if it's a
# module that exists.
result = try_imports(['os'], object())
import os
self.assertThat(result, Is(os))
def test_existing_submodule(self):
# try_imports('thing.another', foo) imports 'thing' and returns it if
# it's a module that exists.
result = try_imports(['os.path'], object())
import os
self.assertThat(result, Is(os.path))
def test_nonexistent_submodule(self):
# try_imports('thing.another', foo) imports 'thing' and returns foo if
# 'another' doesn't exist.
marker = object()
result = try_imports(['os.doesntexist'], marker)
self.assertThat(result, Is(marker))
def test_fallback_submodule(self):
result = try_imports(['os.doesntexist', 'os.path'])
import os
self.assertThat(result, Is(os.path))
def test_error_callback(self):
# One error for every class that doesn't exist.
check_error_callback(self, try_imports,
['os.doesntexist', 'os.notthiseither'],
2, False)
check_error_callback(self, try_imports,
['os.doesntexist', 'os.notthiseither', 'os'],
2, True)
check_error_callback(self, try_imports,
['os.path'],
0, True)
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