Issue #21099: Switch applicable importlib tests to use PEP 451 API.

Lib/test/test_importlib/extension/test_case_sensitivity.py

@@ -7,8 +7,6 @@ from .. import util
 machinery = util.import_importlib('importlib.machinery')
 
 
-# XXX find_spec tests
-
 @unittest.skipIf(util.EXTENSIONS.filename is None, '_testcapi not available')
 @util.case_insensitive_tests
 class ExtensionModuleCaseSensitivityTest:

Lib/test/test_importlib/extension/test_finder.py

@@ -6,7 +6,6 @@ machinery = util.import_importlib('importlib.machinery')
 import unittest
 import warnings
 
-# XXX find_spec tests
 
 class FinderTests(abc.FinderTests):
 

Lib/test/test_importlib/import_/test_path.py

@@ -16,11 +16,14 @@ class FinderTests:
 
     """Tests for PathFinder."""
 
+    find = None
+    check_found = None
+
     def test_failure(self):
         # Test None returned upon not finding a suitable loader.
         module = '<test module>'
         with util.import_state():
-            self.assertIsNone(self.machinery.PathFinder.find_module(module))
+            self.assertIsNone(self.find(module))
 
     def test_sys_path(self):
         # Test that sys.path is used when 'path' is None.
@@ -30,8 +33,8 @@ class FinderTests:
         importer = util.mock_spec(module)
         with util.import_state(path_importer_cache={path: importer},
                                path=[path]):
-            loader = self.machinery.PathFinder.find_module(module)
-            self.assertIs(loader, importer)
+            found = self.find(module)
+            self.check_found(found, importer)
 
     def test_path(self):
         # Test that 'path' is used when set.
@@ -40,8 +43,8 @@ class FinderTests:
         path = '<test path>'
         importer = util.mock_spec(module)
         with util.import_state(path_importer_cache={path: importer}):
-            loader = self.machinery.PathFinder.find_module(module, [path])
-            self.assertIs(loader, importer)
+            found = self.find(module, [path])
+            self.check_found(found, importer)
 
     def test_empty_list(self):
         # An empty list should not count as asking for sys.path.
@@ -50,7 +53,7 @@ class FinderTests:
         importer = util.mock_spec(module)
         with util.import_state(path_importer_cache={path: importer},
                                path=[path]):
-            self.assertIsNone(self.machinery.PathFinder.find_module('module', []))
+            self.assertIsNone(self.find('module', []))
 
     def test_path_hooks(self):
         # Test that sys.path_hooks is used.
@@ -60,8 +63,8 @@ class FinderTests:
         importer = util.mock_spec(module)
         hook = util.mock_path_hook(path, importer=importer)
         with util.import_state(path_hooks=[hook]):
-            loader = self.machinery.PathFinder.find_module(module, [path])
-            self.assertIs(loader, importer)
+            found = self.find(module, [path])
+            self.check_found(found, importer)
             self.assertIn(path, sys.path_importer_cache)
             self.assertIs(sys.path_importer_cache[path], importer)
 
@@ -73,7 +76,7 @@ class FinderTests:
                                path=[path_entry]):
             with warnings.catch_warnings(record=True) as w:
                 warnings.simplefilter('always')
-                self.assertIsNone(self.machinery.PathFinder.find_module('os'))
+                self.assertIsNone(self.find('os'))
                 self.assertIsNone(sys.path_importer_cache[path_entry])
                 self.assertEqual(len(w), 1)
                 self.assertTrue(issubclass(w[-1].category, ImportWarning))
@@ -85,8 +88,8 @@ class FinderTests:
         importer = util.mock_spec(module)
         hook = util.mock_path_hook(os.getcwd(), importer=importer)
         with util.import_state(path=[path], path_hooks=[hook]):
-            loader = self.machinery.PathFinder.find_module(module)
-            self.assertIs(loader, importer)
+            found = self.find(module)
+            self.check_found(found, importer)
             self.assertIn(os.getcwd(), sys.path_importer_cache)
 
     def test_None_on_sys_path(self):
@@ -182,16 +185,33 @@ class FinderTests:
             self.assertIsNone(self.machinery.PathFinder.find_spec('whatever'))
 
 
+class FindModuleTests(FinderTests):
+    def find(self, *args, **kwargs):
+        return self.machinery.PathFinder.find_module(*args, **kwargs)
+    def check_found(self, found, importer):
+        self.assertIs(found, importer)
+
+
+(Frozen_FindModuleTests,
+ Source_FindModuleTests
+) = util.test_both(FindModuleTests, importlib=importlib, machinery=machinery)
 
 
-(Frozen_FinderTests,
- Source_FinderTests
- ) = util.test_both(FinderTests, importlib=importlib, machinery=machinery)
+class FindSpecTests(FinderTests):
+    def find(self, *args, **kwargs):
+        return self.machinery.PathFinder.find_spec(*args, **kwargs)
+    def check_found(self, found, importer):
+        self.assertIs(found.loader, importer)
+
+
+(Frozen_FindSpecTests,
+ Source_FindSpecTests
+ ) = util.test_both(FindSpecTests, importlib=importlib, machinery=machinery)
 
 
 class PathEntryFinderTests:
 
-    def test_finder_with_failing_find_module(self):
+    def test_finder_with_failing_find_spec(self):
         # PathEntryFinder with find_module() defined should work.
         # Issue #20763.
         class Finder:
@@ -209,6 +229,24 @@ class PathEntryFinderTests:
                                path_hooks=[Finder]):
             self.machinery.PathFinder.find_spec('importlib')
 
+    def test_finder_with_failing_find_module(self):
+        # PathEntryFinder with find_module() defined should work.
+        # Issue #20763.
+        class Finder:
+            path_location = 'test_finder_with_find_module'
+            def __init__(self, path):
+                if path != self.path_location:
+                    raise ImportError
+
+            @staticmethod
+            def find_module(fullname):
+                return None
+
+
+        with util.import_state(path=[Finder.path_location]+sys.path[:],
+                               path_hooks=[Finder]):
+            self.machinery.PathFinder.find_module('importlib')
+
 
 (Frozen_PEFTests,
  Source_PEFTests

Lib/test/test_importlib/source/test_file_loader.py

@@ -217,7 +217,7 @@ class SimpleTest(abc.LoaderTests):
             # PEP 302
             with warnings.catch_warnings():
                 warnings.simplefilter('ignore', DeprecationWarning)
-                mod = loader.load_module('_temp') # XXX
+                mod = loader.load_module('_temp')
             # Sanity checks.
             self.assertEqual(mod.__cached__, compiled)
             self.assertEqual(mod.x, 5)
@@ -245,12 +245,7 @@ class SimpleTest(abc.LoaderTests):
 class BadBytecodeTest:
 
     def import_(self, file, module_name):
-        loader = self.loader(module_name, file)
-        with warnings.catch_warnings():
-            warnings.simplefilter('ignore', DeprecationWarning)
-            # XXX Change to use exec_module().
-            module = loader.load_module(module_name)
-        self.assertIn(module_name, sys.modules)
+        raise NotImplementedError
 
     def manipulate_bytecode(self, name, mapping, manipulator, *,
                             del_source=False):

Lib/test/test_importlib/source/test_path_hook.py

@@ -14,11 +14,20 @@ class PathHookTest:
             self.machinery.SOURCE_SUFFIXES))
 
     def test_success(self):
+        with util.create_modules('dummy') as mapping:
+            self.assertTrue(hasattr(self.path_hook()(mapping['.root']),
+                                    'find_spec'))
+
+    def test_success_legacy(self):
         with util.create_modules('dummy') as mapping:
             self.assertTrue(hasattr(self.path_hook()(mapping['.root']),
                                     'find_module'))
 
     def test_empty_string(self):
+        # The empty string represents the cwd.
+        self.assertTrue(hasattr(self.path_hook()(''), 'find_spec'))
+
+    def test_empty_string_legacy(self):
         # The empty string represents the cwd.
         self.assertTrue(hasattr(self.path_hook()(''), 'find_module'))
 

Lib/test/test_importlib/test_abc.py

@@ -207,6 +207,10 @@ class LoaderDefaultsTests(ABCTestHarness):
 
     SPLIT = make_abc_subclasses(Loader)
 
+    def test_create_module(self):
+        spec = 'a spec'
+        self.assertIsNone(self.ins.create_module(spec))
+
     def test_load_module(self):
         with self.assertRaises(ImportError):
             self.ins.load_module('something')
@@ -519,6 +523,12 @@ class InspectLoaderLoadModuleTests:
         support.unload(self.module_name)
         self.addCleanup(support.unload, self.module_name)
 
+    def load(self, loader):
+        spec = self.util.spec_from_loader(self.module_name, loader)
+        with warnings.catch_warnings():
+            warnings.simplefilter('ignore', DeprecationWarning)
+            return self.init._bootstrap._load_unlocked(spec)
+
     def mock_get_code(self):
         return mock.patch.object(self.InspectLoaderSubclass, 'get_code')
 
@@ -528,9 +538,7 @@ class InspectLoaderLoadModuleTests:
             mocked_get_code.side_effect = ImportError
             with self.assertRaises(ImportError):
                 loader = self.InspectLoaderSubclass()
-                with warnings.catch_warnings():
-                    warnings.simplefilter('ignore', DeprecationWarning)
-                    loader.load_module(self.module_name)
+                self.load(loader)
 
     def test_get_code_None(self):
         # If get_code() returns None, raise ImportError.
@@ -538,7 +546,7 @@ class InspectLoaderLoadModuleTests:
             mocked_get_code.return_value = None
             with self.assertRaises(ImportError):
                 loader = self.InspectLoaderSubclass()
-                loader.load_module(self.module_name)
+                self.load(loader)
 
     def test_module_returned(self):
         # The loaded module should be returned.
@@ -546,14 +554,16 @@ class InspectLoaderLoadModuleTests:
         with self.mock_get_code() as mocked_get_code:
             mocked_get_code.return_value = code
             loader = self.InspectLoaderSubclass()
-            module = loader.load_module(self.module_name)
+            module = self.load(loader)
             self.assertEqual(module, sys.modules[self.module_name])
 
 
 (Frozen_ILLoadModuleTests,
  Source_ILLoadModuleTests
  ) = test_util.test_both(InspectLoaderLoadModuleTests,
-                         InspectLoaderSubclass=SPLIT_IL)
+                         InspectLoaderSubclass=SPLIT_IL,
+                         init=init,
+                         util=util)
 
 
 ##### ExecutionLoader concrete methods #########################################

Lib/test/test_importlib/test_api.py

@@ -99,9 +99,7 @@ class ImportModuleTests:
 
 class FindLoaderTests:
 
-    class FakeMetaFinder:
-        @staticmethod
-        def find_module(name, path=None): return name, path
+    FakeMetaFinder = None
 
     def test_sys_modules(self):
         # If a module with __loader__ is in sys.modules, then return it.
@@ -171,9 +169,30 @@ class FindLoaderTests:
             self.assertIsNone(self.init.find_loader('nevergoingtofindthismodule'))
 
 
-(Frozen_FindLoaderTests,
- Source_FindLoaderTests
- ) = test_util.test_both(FindLoaderTests, init=init)
+class FindLoaderPEP451Tests(FindLoaderTests):
+
+    class FakeMetaFinder:
+        @staticmethod
+        def find_spec(name, path=None, target=None):
+            return machinery['Source'].ModuleSpec(name, (name, path))
+
+
+(Frozen_FindLoaderPEP451Tests,
+ Source_FindLoaderPEP451Tests
+ ) = test_util.test_both(FindLoaderPEP451Tests, init=init)
+
+
+class FindLoaderPEP302Tests(FindLoaderTests):
+
+    class FakeMetaFinder:
+        @staticmethod
+        def find_module(name, path=None):
+            return name, path
+
+
+(Frozen_FindLoaderPEP302Tests,
+ Source_FindLoaderPEP302Tests
+ ) = test_util.test_both(FindLoaderPEP302Tests, init=init)
 
 
 class ReloadTests:

Misc/NEWS

@@ -59,6 +59,8 @@ Core and Builtins
 
 - Issue #19711: Add tests for reloading namespace packages.
 
+- Issue #21099: Switch applicable importlib tests to use PEP 451 API.
+
 - Issue #26563: Debug hooks on Python memory allocators now raise a fatal
   error if functions of the :c:func:`PyMem_Malloc` family are called without
   holding the GIL.