bpo-34189: Add simple tests for new Tk widget options. (GH-8396)

Lib/tkinter/test/test_tkinter/test_widgets.py

@@ -703,7 +703,7 @@ class ListboxTest(AbstractWidgetTest, unittest.TestCase):
         'disabledforeground', 'exportselection',
         'font', 'foreground', 'height',
         'highlightbackground', 'highlightcolor', 'highlightthickness',
-        'listvariable', 'relief',
+        'justify', 'listvariable', 'relief',
         'selectbackground', 'selectborderwidth', 'selectforeground',
         'selectmode', 'setgrid', 'state',
         'takefocus', 'width', 'xscrollcommand', 'yscrollcommand',
@@ -717,6 +717,10 @@ class ListboxTest(AbstractWidgetTest, unittest.TestCase):
         self.checkEnumParam(widget, 'activestyle',
                             'dotbox', 'none', 'underline')
 
+    @requires_tcl(8, 6, 5)
+    def test_justify(self):
+        AbstractWidgetTest.test_justify(self)
+
     def test_listvariable(self):
         widget = self.create()
         var = tkinter.DoubleVar(self.root)
@@ -951,7 +955,9 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
     OPTIONS = (
         'background', 'borderwidth', 'cursor',
         'handlepad', 'handlesize', 'height',
-        'opaqueresize', 'orient', 'relief',
+        'opaqueresize', 'orient',
+        'proxybackground', 'proxyborderwidth', 'proxyrelief',
+        'relief',
         'sashcursor', 'sashpad', 'sashrelief', 'sashwidth',
         'showhandle', 'width',
     )
@@ -978,6 +984,23 @@ class PanedWindowTest(AbstractWidgetTest, unittest.TestCase):
         widget = self.create()
         self.checkBooleanParam(widget, 'opaqueresize')
 
+    @requires_tcl(8, 6, 5)
+    def test_proxybackground(self):
+        widget = self.create()
+        self.checkColorParam(widget, 'proxybackground')
+
+    @requires_tcl(8, 6, 5)
+    def test_proxyborderwidth(self):
+        widget = self.create()
+        self.checkPixelsParam(widget, 'proxyborderwidth',
+                              0, 1.3, 2.9, 6, -2, '10p',
+                              conv=noconv)
+
+    @requires_tcl(8, 6, 5)
+    def test_proxyrelief(self):
+        widget = self.create()
+        self.checkReliefParam(widget, 'proxyrelief')
+
     def test_sashcursor(self):
         widget = self.create()
         self.checkCursorParam(widget, 'sashcursor')