Issue #19593: Use specific asserts in importlib tests.

Lib/test/test_import.py

@@ -190,12 +190,12 @@ class ImportTests(unittest.TestCase):
         # import x.y.z binds x in the current namespace
         import test as x
         import test.support
-        self.assertTrue(x is test, x.__name__)
+        self.assertIs(x, test, x.__name__)
         self.assertTrue(hasattr(test.support, "__file__"))
 
         # import x.y.z as w binds z as w
         import test.support as y
-        self.assertTrue(y is test.support, y.__name__)
+        self.assertIs(y, test.support, y.__name__)
 
     def test_failing_reload(self):
         # A failing reload should leave the module object in sys.modules.
@@ -223,7 +223,7 @@ class ImportTests(unittest.TestCase):
             self.assertRaises(ZeroDivisionError, importlib.reload, mod)
             # But we still expect the module to be in sys.modules.
             mod = sys.modules.get(TESTFN)
-            self.assertIsNot(mod, None, "expected module to be in sys.modules")
+            self.assertIsNotNone(mod, "expected module to be in sys.modules")
 
             # We should have replaced a w/ 10, but the old b value should
             # stick.

Lib/test/test_importlib/builtin/test_loader.py

@@ -88,7 +88,7 @@ class InspectLoaderTests:
     def test_is_package(self):
         # Cannot be a package.
         result = self.machinery.BuiltinImporter.is_package(util.BUILTINS.good_name)
-        self.assertTrue(not result)
+        self.assertFalse(result)
 
     @unittest.skipIf(util.BUILTINS.bad_name is None, 'all modules are built in')
     def test_not_builtin(self):

Lib/test/test_importlib/import_/test_fromlist.py

@@ -62,7 +62,7 @@ class HandlingFromlist:
             with util.import_state(meta_path=[importer]):
                 module = self.__import__('module', fromlist=['non_existent'])
                 self.assertEqual(module.__name__, 'module')
-                self.assertTrue(not hasattr(module, 'non_existent'))
+                self.assertFalse(hasattr(module, 'non_existent'))
 
     def test_module_from_package(self):
         # [module]

Lib/test/test_importlib/import_/test_meta_path.py

@@ -97,7 +97,7 @@ class CallSignature:
                 args = log[1][0]
                 kwargs = log[1][1]
                 # Assuming all arguments are positional.
-                self.assertTrue(not kwargs)
+                self.assertFalse(kwargs)
                 self.assertEqual(args[0], mod_name)
                 self.assertIs(args[1], path)
 

Lib/test/test_importlib/test_abc.py

@@ -784,7 +784,7 @@ class SourceOnlyLoaderTests(SourceLoaderTestHarness):
                 warnings.simplefilter('ignore', DeprecationWarning)
                 module = self.loader.load_module(self.name)
             self.verify_module(module)
-            self.assertTrue(not hasattr(module, '__path__'))
+            self.assertFalse(hasattr(module, '__path__'))
 
     def test_get_source_encoding(self):
         # Source is considered encoded in UTF-8 by default unless otherwise