gh-95411: IDLE - Enable using the module browser with .pyw files (#95397)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

1 files changed, 10 insertions, 0 deletions

diff --git a/Lib/idlelib/idle_test/test_browser.py b/Lib/idlelib/idle_test/test_browser.py
index 03a50f2..343d50a 100644
--- a/Lib/idlelib/idle_test/test_browser.py
+++ b/Lib/idlelib/idle_test/test_browser.py
@@ -5,6 +5,7 @@ from test.support import requires
 import unittest
 from unittest import mock
 from idlelib.idle_test.mock_idle import Func
+from idlelib.util import py_extensions
 
 from collections import deque
 import os.path
@@ -57,6 +58,15 @@ class ModuleBrowserTest(unittest.TestCase):
         self.assertTrue(mb.node.destroy.called)
         del mb.top.destroy, mb.node.destroy
 
+    def test_is_browseable_extension(self):
+        path = "/path/to/file"
+        for ext in py_extensions:
+            with self.subTest(ext=ext):
+                filename = f'{path}{ext}'
+                actual = browser.is_browseable_extension(filename)
+                expected = ext not in browser.browseable_extension_blocklist
+                self.assertEqual(actual, expected)
+
 
 # Nested tree same as in test_pyclbr.py except for supers on C0. C1.
 mb = pyclbr