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Test the right click in a selection and not in one, as suggested.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: serhiy-storchaka

Lib/idlelib/idle_test/test_editor.py

@@ -238,55 +238,52 @@ def tearDownClass(cls):
     class DummyRMenu:
         def tk_popup(x, y): pass
 
-    def click(self, x=0, y=0):
-        """Simulate a right click at the (x, y) pixel of the text.
-
-        Return the index of the clicked character, as computed by the
-        widget itself.  It cannot be computed here, because the geometry
-        of the text is unknown while its window is not mapped.
+    def click(self):
+        """Simulate a right click at(text pixel 0,0).
         """
-        index = self.text.index(f'@{x},{y}')
         Event = namedtuple('Event', ['x', 'y', 'x_root', 'y_root'])
-        event = Event(x, y, x_root=0, y_root=0)
+        event = Event(0, 0, 0, 0)
         self.assertEqual(self.window.right_menu_event(event), 'break')
-        return index
-
-    def test_rclick_no_selection(self):
-        text = self.text
-        insert(text, 'one two three')
-        index = self.click()
-        self.assertEqual(text.tag_ranges('sel'), ())
-        self.assertEqual(text.index('insert'), index)
+        # This assertion should be moved to a new method that also
+        # text that dummy rmenu.tk_popup is called.
 
-    def test_rclick_outside_selection(self):
+    def test_rclick_not_in_a_selection(self):
+        # Like left click, 'insert' moves to click and any selection is deleted.
+        eq = self.assertEqual
         text = self.text
         insert(text, 'one two three')
-        # The selection does not contain the clicked character.
-        text.tag_add('sel', '1.5', '1.8')
+        # Selection exists but not clicked.
+        text.tag_add('sel', '1.4', '1.7')  # 'two' selected.
+        text.mark_set('insert', '1.7')  # Outside of selection.
+        self.click()
+        eq(text.tag_ranges('sel'), ())
+        eq(text.index('insert'), '1.0')
+        # No selection to click, same result.
         text.mark_set('insert', '1.8')
         index = self.click()
-        self.assertEqual(text.tag_ranges('sel'), ())
-        self.assertEqual(text.index('insert'), index)
+        eq(text.tag_ranges('sel'), ())
+        eq(text.index('insert'), '1.0')
 
     def test_rclick_inside_selection(self):
+        # Unlike left click, selection is not deleted.
+        eq = self.assertEqual
         text = self.text
-        insert(text, 'one two three')
+        insert(text, 'one two three')  # 'insert' at 1.13.
         # The selection contains the clicked character.
-        index = text.index('@0,0')
-        text.tag_add('sel', index, f'{index}+3c')
-        text.mark_set('insert', 'end-1c')
+        text.tag_add('sel', 1.0, 1.3)  # Select 'one'.
+        text.mark_set('insert', '1.3')  # If select rightward, 'insert' at 1.3.
         self.click()
-        self.assertEqual(text.index('sel.first'), index)
-        self.assertEqual(text.index('sel.last'), text.index(f'{index}+3c'))
-        self.assertEqual(text.index('insert'), text.index('end-1c'))
+        eq((text.index('sel.first'), text.index('sel.last')), ('1.0', '1.3'))
+        eq(text.index('insert'), '1.3')
 
     def test_rmenu_check_copy(self):
+        # copy and cut only valid for click inside selection.
+        eq = self.assertEqual
         text = self.text
         insert(text, 'one two three')
-        eq = self.assertEqual
         eq(self.window.rmenu_check_copy(), 'disabled')
         eq(self.window.rmenu_check_cut(), 'disabled')
-        text.tag_add('sel', '1.0', '1.3')
+        text.tag_add('sel', '1.0', '1.3')  # Includes '1.0' click.
         eq(self.window.rmenu_check_copy(), 'normal')
         eq(self.window.rmenu_check_cut(), 'normal')