python
diff --git a/‎Lib/idlelib/idle_test/test_outwin.py‎
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+""" Test idlelib.outwin.
+"""
+
+import unittest
+from tkinter import Tk, Text
+from idlelib.idle_test.mock_tk import Mbox_func
+from idlelib.idle_test.mock_idle import Func
+from idlelib import outwin
+from test.support import requires
+from unittest import mock
+
+
+class OutputWindowTest(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        requires('gui')
+        root = cls.root = Tk()
+        root.withdraw()
+        w = cls.window = outwin.OutputWindow(None, None, None, root)
+        cls.text = w.text = Text(root)
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.window.close()
+        del cls.text, cls.window
+        cls.root.destroy()
+        del cls.root
+
+    def setUp(self):
+        self.text.delete('1.0', 'end')
+
+    def test_ispythonsource(self):
+        # OutputWindow overrides ispythonsource to always return False.
+        w = self.window
+        self.assertFalse(w.ispythonsource('test.txt'))
+        self.assertFalse(w.ispythonsource(__file__))
+
+    def test_window_title(self):
+        self.assertEqual(self.window.top.title(), 'Output')
+
+    def test_maybesave(self):
+        w = self.window
+        eq = self.assertEqual
+        w.get_saved = Func()
+
+        w.get_saved.result = False
+        eq(w.maybesave(), 'no')
+        eq(w.get_saved.called, 1)
+
+        w.get_saved.result = True
+        eq(w.maybesave(), 'yes')
+        eq(w.get_saved.called, 2)
+        del w.get_saved
+
+    def test_write(self):
+        eq = self.assertEqual
+        delete = self.text.delete
+        get = self.text.get
+        write = self.window.write
+
+        # Test bytes.
+        b = b'Test bytes.'
+        eq(write(b), len(b))
+        eq(get('1.0', '1.end'), b.decode())
+
+        # No new line - insert stays on same line.
+        delete('1.0', 'end')
+        test_text = 'test text'
+        eq(write(test_text), len(test_text))
+        eq(get('1.0', '1.end'), 'test text')
+        eq(get('insert linestart', 'insert lineend'), 'test text')
+
+        # New line - insert moves to next line.
+        delete('1.0', 'end')
+        test_text = 'test text\n'
+        eq(write(test_text), len(test_text))
+        eq(get('1.0', '1.end'), 'test text')
+        eq(get('insert linestart', 'insert lineend'), '')
+
+        # Text after new line is tagged for second line of Text widget.
+        delete('1.0', 'end')
+        test_text = 'test text\nLine 2'
+        eq(write(test_text), len(test_text))
+        eq(get('1.0', '1.end'), 'test text')
+        eq(get('2.0', '2.end'), 'Line 2')
+        eq(get('insert linestart', 'insert lineend'), 'Line 2')
+
+        # Test tags.
+        delete('1.0', 'end')
+        test_text = 'test text\n'
+        test_text2 = 'Line 2\n'
+        eq(write(test_text, tags='mytag'), len(test_text))
+        eq(write(test_text2, tags='secondtag'), len(test_text2))
+        eq(get('mytag.first', 'mytag.last'), test_text)
+        eq(get('secondtag.first', 'secondtag.last'), test_text2)
+        eq(get('1.0', '1.end'), test_text.rstrip('\n'))
+        eq(get('2.0', '2.end'), test_text2.rstrip('\n'))
+
+    def test_writelines(self):
+        eq = self.assertEqual
+        get = self.text.get
+        writelines = self.window.writelines
+
+        writelines(('Line 1\n', 'Line 2\n', 'Line 3\n'))
+        eq(get('1.0', '1.end'), 'Line 1')
+        eq(get('2.0', '2.end'), 'Line 2')
+        eq(get('3.0', '3.end'), 'Line 3')
+        eq(get('insert linestart', 'insert lineend'), '')
+
+    def test_goto_file_line(self):
+        eq = self.assertEqual
+        w = self.window
+        text = self.text
+
+        w.flist = mock.Mock()
+        gfl = w.flist.gotofileline = Func()
+        showerror = w.showerror = Mbox_func()
+
+        # No file/line number.
+        w.write('Not a file line')
+        self.assertIsNone(w.goto_file_line())
+        eq(gfl.called, 0)
+        eq(showerror.title, 'No special line')
+
+        # Current file/line number.
+        w.write(f'{str(__file__)}: 42: spam\n')
+        w.write(f'{str(__file__)}: 21: spam')
+        self.assertIsNone(w.goto_file_line())
+        eq(gfl.args, (str(__file__), 21))
+
+        # Previous line has file/line number.
+        text.delete('1.0', 'end')
+        w.write(f'{str(__file__)}: 42: spam\n')
+        w.write('Not a file line')
+        self.assertIsNone(w.goto_file_line())
+        eq(gfl.args, (str(__file__), 42))
+
+        del w.flist.gotofileline, w.showerror
+
+
+class ModuleFunctionTest(unittest.TestCase):
+
+    @classmethod
+    def setUp(cls):
+        outwin.file_line_progs = None
+
+    def test_compile_progs(self):
+        outwin.compile_progs()
+        for pat, regex in zip(outwin.file_line_pats, outwin.file_line_progs):
+            self.assertEqual(regex.pattern, pat)
+
+    @mock.patch('builtins.open')
+    def test_file_line_helper(self, mock_open):
+        flh = outwin.file_line_helper
+        test_lines = (
+            (r'foo file "testfile1", line 42, bar', ('testfile1', 42)),
+            (r'foo testfile2(21) bar', ('testfile2', 21)),
+            (r'  testfile3  : 42: foo bar\n', ('  testfile3  ', 42)),
+            (r'foo testfile4.py :1: ', ('foo testfile4.py ', 1)),
+            ('testfile5: \u19D4\u19D2: ', ('testfile5', 42)),
+            (r'testfile6: 42', None),       # only one `:`
+            (r'testfile7 42 text', None)    # no separators
+            )
+        for line, expected_output in test_lines:
+            self.assertEqual(flh(line), expected_output)
+            if expected_output:
+                mock_open.assert_called_with(expected_output[0], 'r')
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)