comment here

.CondaPkg/env/lib/python3.11/idlelib/idle_test/test_stackviewer.py

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+"Test stackviewer, coverage 63%."
+
+from idlelib import stackviewer
+import unittest
+from test.support import requires
+from tkinter import Tk
+
+from idlelib.tree import TreeNode, ScrolledCanvas
+import sys
+
+
+class StackBrowserTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        svs = stackviewer.sys
+        try:
+            abc
+        except NameError:
+            svs.last_type, svs.last_value, svs.last_traceback = (
+                sys.exc_info())
+
+        requires('gui')
+        cls.root = Tk()
+        cls.root.withdraw()
+
+    @classmethod
+    def tearDownClass(cls):
+        svs = stackviewer.sys
+        del svs.last_traceback, svs.last_type, svs.last_value
+
+        cls.root.update_idletasks()
+##        for id in cls.root.tk.call('after', 'info'):
+##            cls.root.after_cancel(id)  # Need for EditorWindow.
+        cls.root.destroy()
+        del cls.root
+
+    def test_init(self):
+        sb = stackviewer.StackBrowser(self.root)
+        isi = self.assertIsInstance
+        isi(stackviewer.sc, ScrolledCanvas)
+        isi(stackviewer.item, stackviewer.StackTreeItem)
+        isi(stackviewer.node, TreeNode)
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)