bpo-17535: IDLE editor line numbers (GH-14030)

Lib/idlelib/idle_test/test_codecontext.py

@@ -4,7 +4,7 @@ from idlelib import codecontext
 import unittest
 import unittest.mock
 from test.support import requires
-from tkinter import Tk, Frame, Text, TclError
+from tkinter import NSEW, Tk, Frame, Text, TclError
 
 from unittest import mock
 import re
@@ -62,7 +62,7 @@ class CodeContextTest(unittest.TestCase):
         text.insert('1.0', code_sample)
         # Need to pack for creation of code context text widget.
         frame.pack(side='left', fill='both', expand=1)
-        text.pack(side='top', fill='both', expand=1)
+        text.grid(row=1, column=1, sticky=NSEW)
         cls.editor = DummyEditwin(root, frame, text)
         codecontext.idleConf.userCfg = testcfg
 
@@ -77,6 +77,7 @@ class CodeContextTest(unittest.TestCase):
 
     def setUp(self):
         self.text.yview(0)
+        self.text['font'] = 'TkFixedFont'
         self.cc = codecontext.CodeContext(self.editor)
 
         self.highlight_cfg = {"background": '#abcdef',
@@ -86,10 +87,18 @@ class CodeContextTest(unittest.TestCase):
             if element == 'context':
                 return self.highlight_cfg
             return orig_idleConf_GetHighlight(theme, element)
-        patcher = unittest.mock.patch.object(
+        GetHighlight_patcher = unittest.mock.patch.object(
             codecontext.idleConf, 'GetHighlight', mock_idleconf_GetHighlight)
-        patcher.start()
-        self.addCleanup(patcher.stop)
+        GetHighlight_patcher.start()
+        self.addCleanup(GetHighlight_patcher.stop)
+
+        self.font_override = 'TkFixedFont'
+        def mock_idleconf_GetFont(root, configType, section):
+            return self.font_override
+        GetFont_patcher = unittest.mock.patch.object(
+            codecontext.idleConf, 'GetFont', mock_idleconf_GetFont)
+        GetFont_patcher.start()
+        self.addCleanup(GetFont_patcher.stop)
 
     def tearDown(self):
         if self.cc.context:
@@ -339,69 +348,59 @@ class CodeContextTest(unittest.TestCase):
     def test_font(self):
         eq = self.assertEqual
         cc = self.cc
-        save_font = cc.text['font']
+
+        orig_font = cc.text['font']
         test_font = 'TkTextFont'
+        self.assertNotEqual(orig_font, test_font)
 
         # Ensure code context is not active.
         if cc.context is not None:
             cc.toggle_code_context_event()
 
+        self.font_override = test_font
         # Nothing breaks or changes with inactive code context.
-        cc.update_font(test_font)
+        cc.update_font()
 
-        # Activate code context, but no change to font.
+        # Activate code context, previous font change is immediately effective.
         cc.toggle_code_context_event()
-        eq(cc.context['font'], save_font)
-        # Call font update with the existing font.
-        cc.update_font(save_font)
-        eq(cc.context['font'], save_font)
-        cc.toggle_code_context_event()
-
-        # Change text widget font and activate code context.
-        cc.text['font'] = test_font
-        cc.toggle_code_context_event(test_font)
         eq(cc.context['font'], test_font)
 
-        # Just call the font update.
-        cc.update_font(save_font)
-        eq(cc.context['font'], save_font)
-        cc.text['font'] = save_font
+        # Call the font update, change is picked up.
+        self.font_override = orig_font
+        cc.update_font()
+        eq(cc.context['font'], orig_font)
 
     def test_highlight_colors(self):
         eq = self.assertEqual
         cc = self.cc
-        save_colors = dict(self.highlight_cfg)
+
+        orig_colors = dict(self.highlight_cfg)
         test_colors = {'background': '#222222', 'foreground': '#ffff00'}
 
+        def assert_colors_are_equal(colors):
+            eq(cc.context['background'], colors['background'])
+            eq(cc.context['foreground'], colors['foreground'])
+
         # Ensure code context is not active.
         if cc.context:
             cc.toggle_code_context_event()
 
+        self.highlight_cfg = test_colors
         # Nothing breaks with inactive code context.
         cc.update_highlight_colors()
 
-        # Activate code context, but no change to colors.
+        # Activate code context, previous colors change is immediately effective.
         cc.toggle_code_context_event()
-        eq(cc.context['background'], save_colors['background'])
-        eq(cc.context['foreground'], save_colors['foreground'])
+        assert_colors_are_equal(test_colors)
 
-        # Call colors update, but no change to font.
+        # Call colors update with no change to the configured colors.
         cc.update_highlight_colors()
-        eq(cc.context['background'], save_colors['background'])
-        eq(cc.context['foreground'], save_colors['foreground'])
-        cc.toggle_code_context_event()
+        assert_colors_are_equal(test_colors)
 
-        # Change colors and activate code context.
-        self.highlight_cfg = test_colors
-        cc.toggle_code_context_event()
-        eq(cc.context['background'], test_colors['background'])
-        eq(cc.context['foreground'], test_colors['foreground'])
-
-        # Change colors and call highlight colors update.
-        self.highlight_cfg = save_colors
+        # Call the colors update with code context active, change is picked up.
+        self.highlight_cfg = orig_colors
         cc.update_highlight_colors()
-        eq(cc.context['background'], save_colors['background'])
-        eq(cc.context['foreground'], save_colors['foreground'])
+        assert_colors_are_equal(orig_colors)
 
 
 class HelperFunctionText(unittest.TestCase):