diff -r 5c7697f28ee4 Lib/idlelib/idle_test/test_textview.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Lib/idlelib/idle_test/test_textview.py	Mon Sep 02 21:50:26 2013 -0400
@@ -0,0 +1,92 @@
+'''Test the functions and main class method of textView.py.'''
+
+import unittest
+import os
+from test.support import requires
+from tkinter import Tk, Text, TclError
+from idlelib import textView as tv
+from idlelib.idle_test.mock_tk import Mbox
+
+orig_mbox = tv.tkMessageBox
+
+class tv_func:
+    def __init__(self):
+        self.result = None
+        self.called = False
+
+    def __call__(self, *args, **kwds):
+        self.called = True
+        return self.result
+
+class textviewClassTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        requires('gui')
+        cls.root = Tk()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.destroy()
+
+    def test_init_modal(self):
+        view = tv.TextViewer.__new__(tv.TextViewer)
+        view.transient = tv_func()
+        view.grab_set = tv_func()
+        view.wait_window = tv_func()
+
+        view.__init__(self.root, 'Title', 'test text')
+        self.assertIsInstance(view, tv.TextViewer)
+        self.assertTrue(view.transient.called)
+        self.assertTrue(view.grab_set.called)
+        self.assertTrue(view.wait_window.called)
+        view.Ok()
+
+    def test_init_nonmodal(self):
+        view = tv.TextViewer(self.root, 'Title', 'test text', modal=False)
+        self.assertIsInstance(view, tv.TextViewer)
+        view.Ok()
+
+    def test_createwidgets(self):
+        pass
+
+    def test_ok(self):
+        view = tv.TextViewer(self.root, 'Title', 'test text', modal=False)
+        view.destroy = tv_func()
+        view.Ok()
+        self.assertTrue(view.destroy.called)
+
+
+class textviewTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        requires('gui')
+        cls.root = Tk()
+        tv.tkMessageBox = Mbox
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.root.destroy()
+        tv.tkMessageBox = orig_mbox
+
+    def test_view_text(self):
+        # If modal True, tkinter will error with 'can't invoke "event" command'
+        view = tv.view_text(self.root, 'Title', 'test text', modal=False)
+        self.assertIsInstance(view, tv.TextViewer)
+
+    def test_view_file(self):
+        file = __file__
+        test_dir = os.path.dirname(file)
+        testfile = os.path.join(test_dir, '../testcode.py')
+        view = tv.view_file(self.root, 'Title', testfile, modal=False)
+        self.assertIsInstance(view, tv.TextViewer)
+        view.Ok()
+
+        # Mock messagebox will be used and view_file will not return anything
+        testfile = os.path.join(test_dir, '../notthere.py')
+        view = tv.view_file(self.root, 'Title', testfile, modal=False)
+        self.assertIsNone(view)
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2, exit=2)
diff -r 5c7697f28ee4 Lib/idlelib/textView.py
--- a/Lib/idlelib/textView.py	Mon Sep 02 08:57:21 2013 -0700
+++ b/Lib/idlelib/textView.py	Mon Sep 02 21:50:26 2013 -0400
@@ -12,6 +12,9 @@
     def __init__(self, parent, title, text, modal=True):
         """Show the given text in a scrollable window with a 'close' button
 
+        If modal option set to False, user can interact with other windows,
+        otherwise they will be unable to interact with other windows until
+        the textview window is closed.
         """
         Toplevel.__init__(self, parent)
         self.configure(borderwidth=5)
@@ -67,7 +70,6 @@
         with open(filename, 'r', encoding=encoding) as file:
             contents = file.read()
     except OSError:
-        import tkinter.messagebox as tkMessageBox
         tkMessageBox.showerror(title='File Load Error',
                                message='Unable to load file %r .' % filename,
                                parent=parent)
@@ -75,23 +77,7 @@
         return view_text(parent, title, contents, modal)
 
 
-if __name__ == '__main__':
-    #test the dialog
-    root=Tk()
-    root.title('textView test')
-    filename = './textView.py'
-    with open(filename, 'r') as f:
-        text = f.read()
-    btn1 = Button(root, text='view_text',
-                  command=lambda:view_text(root, 'view_text', text))
-    btn1.pack(side=LEFT)
-    btn2 = Button(root, text='view_file',
-                  command=lambda:view_file(root, 'view_file', filename))
-    btn2.pack(side=LEFT)
-    btn3 = Button(root, text='nonmodal view_text',
-                  command=lambda:view_text(root, 'nonmodal view_text', text,
-                                           modal=False))
-    btn3.pack(side=LEFT)
-    close = Button(root, text='Close', command=root.destroy)
-    close.pack(side=RIGHT)
-    root.mainloop()
+if __name__ == "__main__":
+    from test import support; support.use_resources = ['gui']
+    import unittest
+    unittest.main('idlelib.idle_test.test_textview', verbosity=2, exit=False)