94 lines
3.6 KiB
Python
94 lines
3.6 KiB
Python
from . import util
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import imp
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import importlib
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import sys
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import unittest
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class ImportModuleTests(unittest.TestCase):
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"""Test importlib.import_module."""
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def test_module_import(self):
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# Test importing a top-level module.
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with util.mock_modules('top_level') as mock:
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with util.import_state(meta_path=[mock]):
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module = importlib.import_module('top_level')
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self.assertEqual(module.__name__, 'top_level')
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def test_absolute_package_import(self):
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# Test importing a module from a package with an absolute name.
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pkg_name = 'pkg'
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pkg_long_name = '{0}.__init__'.format(pkg_name)
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name = '{0}.mod'.format(pkg_name)
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with util.mock_modules(pkg_long_name, name) as mock:
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with util.import_state(meta_path=[mock]):
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module = importlib.import_module(name)
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self.assertEqual(module.__name__, name)
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def test_shallow_relative_package_import(self):
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# Test importing a module from a package through a relative import.
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pkg_name = 'pkg'
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pkg_long_name = '{0}.__init__'.format(pkg_name)
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module_name = 'mod'
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absolute_name = '{0}.{1}'.format(pkg_name, module_name)
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relative_name = '.{0}'.format(module_name)
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with util.mock_modules(pkg_long_name, absolute_name) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module(pkg_name)
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module = importlib.import_module(relative_name, pkg_name)
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self.assertEqual(module.__name__, absolute_name)
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def test_deep_relative_package_import(self):
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modules = ['a.__init__', 'a.b.__init__', 'a.c']
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with util.mock_modules(*modules) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module('a')
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importlib.import_module('a.b')
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module = importlib.import_module('..c', 'a.b')
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self.assertEqual(module.__name__, 'a.c')
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def test_absolute_import_with_package(self):
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# Test importing a module from a package with an absolute name with
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# the 'package' argument given.
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pkg_name = 'pkg'
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pkg_long_name = '{0}.__init__'.format(pkg_name)
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name = '{0}.mod'.format(pkg_name)
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with util.mock_modules(pkg_long_name, name) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module(pkg_name)
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module = importlib.import_module(name, pkg_name)
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self.assertEqual(module.__name__, name)
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def test_relative_import_wo_package(self):
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# Relative imports cannot happen without the 'package' argument being
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# set.
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with self.assertRaises(TypeError):
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importlib.import_module('.support')
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def test_loaded_once(self):
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# Issue #13591: Modules should only be loaded once when
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# initializing the parent package attempts to import the
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# module currently being imported.
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b_load_count = 0
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def load_a():
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importlib.import_module('a.b')
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def load_b():
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nonlocal b_load_count
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b_load_count += 1
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code = {'a': load_a, 'a.b': load_b}
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modules = ['a.__init__', 'a.b']
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with util.mock_modules(*modules, module_code=code) as mock:
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with util.import_state(meta_path=[mock]):
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importlib.import_module('a.b')
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self.assertEqual(b_load_count, 1)
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def test_main():
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from test.support import run_unittest
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run_unittest(ImportModuleTests)
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if __name__ == '__main__':
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test_main()
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