Issue #19593: Use specific asserts in importlib tests.

diff --cc Lib/test/test_importlib/builtin/test_loader.py
index eaee0254836cf5988bd3d22289b6317284e2f245,1f8357402f670ad38d9eba78b37760deab33748b..1684ab6eb411a07f836de96fff0d69692e085ab6
--- 1/Lib/test/test_importlib/builtin/test_loader.py
--- 2/Lib/test/test_importlib/builtin/test_loader.py
+++ b/Lib/test/test_importlib/builtin/test_loader.py
@@@ -87,10 -86,9 +87,10 @@@ class InspectLoaderTests
  
      def test_is_package(self):
          # Cannot be a package.
 -        result = self.machinery.BuiltinImporter.is_package(builtin_util.NAME)
 +        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):
          # Modules not built-in should raise ImportError.
          for meth_name in ('get_code', 'get_source', 'is_package'):

diff --cc Lib/test/test_importlib/import_/test_fromlist.py
Simple merge

diff --cc Lib/test/test_importlib/import_/test_meta_path.py
Simple merge

diff --cc Lib/test/test_importlib/test_abc.py
Simple merge