cpython/Lib/idlelib/idle_test/test_squeezer.py

"Test squeezer, coverage 95%"

from collections import namedtuple
from textwrap import dedent
from tkinter import Text, Tk
import unittest
from unittest.mock import Mock, NonCallableMagicMock, patch, sentinel, ANY
from test.support import requires

from idlelib.config import idleConf
from idlelib.squeezer import count_lines_with_wrapping, ExpandingButton, \
    Squeezer
from idlelib import macosx
from idlelib.textview import view_text
from idlelib.tooltip import Hovertip
from idlelib.pyshell import PyShell


SENTINEL_VALUE = sentinel.SENTINEL_VALUE


def get_test_tk_root(test_instance):
    """Helper for tests: Create a root Tk object."""
    requires('gui')
    root = Tk()
    root.withdraw()

    def cleanup_root():
        root.update_idletasks()
        root.destroy()
    test_instance.addCleanup(cleanup_root)

    return root


class CountLinesTest(unittest.TestCase):
    """Tests for the count_lines_with_wrapping function."""
    def check(self, expected, text, linewidth):
        return self.assertEqual(
            expected,
            count_lines_with_wrapping(text, linewidth),
        )

    def test_count_empty(self):
        """Test with an empty string."""
        self.assertEqual(count_lines_with_wrapping(""), 0)

    def test_count_begins_with_empty_line(self):
        """Test with a string which begins with a newline."""
        self.assertEqual(count_lines_with_wrapping("\ntext"), 2)

    def test_count_ends_with_empty_line(self):
        """Test with a string which ends with a newline."""
        self.assertEqual(count_lines_with_wrapping("text\n"), 1)

    def test_count_several_lines(self):
        """Test with several lines of text."""
        self.assertEqual(count_lines_with_wrapping("1\n2\n3\n"), 3)

    def test_empty_lines(self):
        self.check(expected=1, text='\n', linewidth=80)
        self.check(expected=2, text='\n\n', linewidth=80)
        self.check(expected=10, text='\n' * 10, linewidth=80)

    def test_long_line(self):
        self.check(expected=3, text='a' * 200, linewidth=80)
        self.check(expected=3, text='a' * 200 + '\n', linewidth=80)

    def test_several_lines_different_lengths(self):
        text = dedent("""\
            13 characters
            43 is the number of characters on this line

            7 chars
            13 characters""")
        self.check(expected=5, text=text, linewidth=80)
        self.check(expected=5, text=text + '\n', linewidth=80)
        self.check(expected=6, text=text, linewidth=40)
        self.check(expected=7, text=text, linewidth=20)
        self.check(expected=11, text=text, linewidth=10)


class SqueezerTest(unittest.TestCase):
    """Tests for the Squeezer class."""
    def make_mock_editor_window(self, with_text_widget=False):
        """Create a mock EditorWindow instance."""
        editwin = NonCallableMagicMock()
        editwin.width = 80

        if with_text_widget:
            editwin.root = get_test_tk_root(self)
            text_widget = self.make_text_widget(root=editwin.root)
            editwin.text = editwin.per.bottom = text_widget

        return editwin

    def make_squeezer_instance(self, editor_window=None):
        """Create an actual Squeezer instance with a mock EditorWindow."""
        if editor_window is None:
            editor_window = self.make_mock_editor_window()
        squeezer = Squeezer(editor_window)
        return squeezer

    def make_text_widget(self, root=None):
        if root is None:
            root = get_test_tk_root(self)
        text_widget = Text(root)
        text_widget["font"] = ('Courier', 10)
        text_widget.mark_set("iomark", "1.0")
        return text_widget

    def set_idleconf_option_with_cleanup(self, configType, section, option, value):
        prev_val = idleConf.GetOption(configType, section, option)
        idleConf.SetOption(configType, section, option, value)
        self.addCleanup(idleConf.SetOption,
                        configType, section, option, prev_val)

    def test_count_lines(self):
        """Test Squeezer.count_lines() with various inputs."""
        editwin = self.make_mock_editor_window()
        squeezer = self.make_squeezer_instance(editwin)

        for text_code, line_width, expected in [
            (r"'\n'", 80, 1),
            (r"'\n' * 3", 80, 3),
            (r"'a' * 40 + '\n'", 80, 1),
            (r"'a' * 80 + '\n'", 80, 1),
            (r"'a' * 200 + '\n'", 80, 3),
            (r"'aa\t' * 20", 80, 2),
            (r"'aa\t' * 21", 80, 3),
            (r"'aa\t' * 20", 40, 4),
        ]:
            with self.subTest(text_code=text_code,
                              line_width=line_width,
                              expected=expected):
                text = eval(text_code)
                with patch.object(editwin, 'width', line_width):
                    self.assertEqual(squeezer.count_lines(text), expected)

    def test_init(self):
        """Test the creation of Squeezer instances."""
        editwin = self.make_mock_editor_window()
        squeezer = self.make_squeezer_instance(editwin)
        self.assertIs(squeezer.editwin, editwin)
        self.assertEqual(squeezer.expandingbuttons, [])

    def test_write_no_tags(self):
        """Test Squeezer's overriding of the EditorWindow's write() method."""
        editwin = self.make_mock_editor_window()
        for text in ['', 'TEXT', 'LONG TEXT' * 1000, 'MANY_LINES\n' * 100]:
            editwin.write = orig_write = Mock(return_value=SENTINEL_VALUE)
            squeezer = self.make_squeezer_instance(editwin)

            self.assertEqual(squeezer.editwin.write(text, ()), SENTINEL_VALUE)
            self.assertEqual(orig_write.call_count, 1)
            orig_write.assert_called_with(text, ())
            self.assertEqual(len(squeezer.expandingbuttons), 0)

    def test_write_not_stdout(self):
        """Test Squeezer's overriding of the EditorWindow's write() method."""
        for text in ['', 'TEXT', 'LONG TEXT' * 1000, 'MANY_LINES\n' * 100]:
            editwin = self.make_mock_editor_window()
            editwin.write.return_value = SENTINEL_VALUE
            orig_write = editwin.write
            squeezer = self.make_squeezer_instance(editwin)

            self.assertEqual(squeezer.editwin.write(text, "stderr"),
                              SENTINEL_VALUE)
            self.assertEqual(orig_write.call_count, 1)
            orig_write.assert_called_with(text, "stderr")
            self.assertEqual(len(squeezer.expandingbuttons), 0)

    def test_write_stdout(self):
        """Test Squeezer's overriding of the EditorWindow's write() method."""
        editwin = self.make_mock_editor_window()

        for text in ['', 'TEXT']:
            editwin.write = orig_write = Mock(return_value=SENTINEL_VALUE)
            squeezer = self.make_squeezer_instance(editwin)
            squeezer.auto_squeeze_min_lines = 50

            self.assertEqual(squeezer.editwin.write(text, "stdout"),
                             SENTINEL_VALUE)
            self.assertEqual(orig_write.call_count, 1)
            orig_write.assert_called_with(text, "stdout")
            self.assertEqual(len(squeezer.expandingbuttons), 0)

        for text in ['LONG TEXT' * 1000, 'MANY_LINES\n' * 100]:
            editwin.write = orig_write = Mock(return_value=SENTINEL_VALUE)
            squeezer = self.make_squeezer_instance(editwin)
            squeezer.auto_squeeze_min_lines = 50

            self.assertEqual(squeezer.editwin.write(text, "stdout"), None)
            self.assertEqual(orig_write.call_count, 0)
            self.assertEqual(len(squeezer.expandingbuttons), 1)

    def test_auto_squeeze(self):
        """Test that the auto-squeezing creates an ExpandingButton properly."""
        editwin = self.make_mock_editor_window(with_text_widget=True)
        text_widget = editwin.text
        squeezer = self.make_squeezer_instance(editwin)
        squeezer.auto_squeeze_min_lines = 5
        squeezer.count_lines = Mock(return_value=6)

        editwin.write('TEXT\n'*6, "stdout")
        self.assertEqual(text_widget.get('1.0', 'end'), '\n')
        self.assertEqual(len(squeezer.expandingbuttons), 1)

    def test_squeeze_current_text_event(self):
        """Test the squeeze_current_text event."""
        # Squeezing text should work for both stdout and stderr.
        for tag_name in ["stdout", "stderr"]:
            editwin = self.make_mock_editor_window(with_text_widget=True)
            text_widget = editwin.text
            squeezer = self.make_squeezer_instance(editwin)
            squeezer.count_lines = Mock(return_value=6)

            # Prepare some text in the Text widget.
            text_widget.insert("1.0", "SOME\nTEXT\n", tag_name)
            text_widget.mark_set("insert", "1.0")
            self.assertEqual(text_widget.get('1.0', 'end'), 'SOME\nTEXT\n\n')

            self.assertEqual(len(squeezer.expandingbuttons), 0)

            # Test squeezing the current text.
            retval = squeezer.squeeze_current_text_event(event=Mock())
            self.assertEqual(retval, "break")
            self.assertEqual(text_widget.get('1.0', 'end'), '\n\n')
            self.assertEqual(len(squeezer.expandingbuttons), 1)
            self.assertEqual(squeezer.expandingbuttons[0].s, 'SOME\nTEXT')

            # Test that expanding the squeezed text works and afterwards
            # the Text widget contains the original text.
            squeezer.expandingbuttons[0].expand(event=Mock())
            self.assertEqual(text_widget.get('1.0', 'end'), 'SOME\nTEXT\n\n')
            self.assertEqual(len(squeezer.expandingbuttons), 0)

    def test_squeeze_current_text_event_no_allowed_tags(self):
        """Test that the event doesn't squeeze text without a relevant tag."""
        editwin = self.make_mock_editor_window(with_text_widget=True)
        text_widget = editwin.text
        squeezer = self.make_squeezer_instance(editwin)
        squeezer.count_lines = Mock(return_value=6)

        # Prepare some text in the Text widget.
        text_widget.insert("1.0", "SOME\nTEXT\n", "TAG")
        text_widget.mark_set("insert", "1.0")
        self.assertEqual(text_widget.get('1.0', 'end'), 'SOME\nTEXT\n\n')

        self.assertEqual(len(squeezer.expandingbuttons), 0)

        # Test squeezing the current text.
        retval = squeezer.squeeze_current_text_event(event=Mock())
        self.assertEqual(retval, "break")
        self.assertEqual(text_widget.get('1.0', 'end'), 'SOME\nTEXT\n\n')
        self.assertEqual(len(squeezer.expandingbuttons), 0)

    def test_squeeze_text_before_existing_squeezed_text(self):
        """Test squeezing text before existing squeezed text."""
        editwin = self.make_mock_editor_window(with_text_widget=True)
        text_widget = editwin.text
        squeezer = self.make_squeezer_instance(editwin)
        squeezer.count_lines = Mock(return_value=6)

        # Prepare some text in the Text widget and squeeze it.
        text_widget.insert("1.0", "SOME\nTEXT\n", "stdout")
        text_widget.mark_set("insert", "1.0")
        squeezer.squeeze_current_text_event(event=Mock())
        self.assertEqual(len(squeezer.expandingbuttons), 1)

        # Test squeezing the current text.
        text_widget.insert("1.0", "MORE\nSTUFF\n", "stdout")
        text_widget.mark_set("insert", "1.0")
        retval = squeezer.squeeze_current_text_event(event=Mock())
        self.assertEqual(retval, "break")
        self.assertEqual(text_widget.get('1.0', 'end'), '\n\n\n')
        self.assertEqual(len(squeezer.expandingbuttons), 2)
        self.assertTrue(text_widget.compare(
            squeezer.expandingbuttons[0],
            '<',
            squeezer.expandingbuttons[1],
        ))

    def test_reload(self):
        """Test the reload() class-method."""
        editwin = self.make_mock_editor_window(with_text_widget=True)
        squeezer = self.make_squeezer_instance(editwin)

        orig_auto_squeeze_min_lines = squeezer.auto_squeeze_min_lines

        # Increase auto-squeeze-min-lines.
        new_auto_squeeze_min_lines = orig_auto_squeeze_min_lines + 10
        self.set_idleconf_option_with_cleanup(
            'main', 'PyShell', 'auto-squeeze-min-lines',
            str(new_auto_squeeze_min_lines))

        Squeezer.reload()
        self.assertEqual(squeezer.auto_squeeze_min_lines,
                         new_auto_squeeze_min_lines)

    def test_reload_no_squeezer_instances(self):
        """Test that Squeezer.reload() runs without any instances existing."""
        Squeezer.reload()


class ExpandingButtonTest(unittest.TestCase):
    """Tests for the ExpandingButton class."""
    # In these tests the squeezer instance is a mock, but actual tkinter
    # Text and Button instances are created.
    def make_mock_squeezer(self):
        """Helper for tests: Create a mock Squeezer object."""
        root = get_test_tk_root(self)
        squeezer = Mock()
        squeezer.editwin.text = Text(root)

        # Set default values for the configuration settings.
        squeezer.auto_squeeze_min_lines = 50
        return squeezer

    @patch('idlelib.squeezer.Hovertip', autospec=Hovertip)
    def test_init(self, MockHovertip):
        """Test the simplest creation of an ExpandingButton."""
        squeezer = self.make_mock_squeezer()
        text_widget = squeezer.editwin.text

        expandingbutton = ExpandingButton('TEXT', 'TAGS', 50, squeezer)
        self.assertEqual(expandingbutton.s, 'TEXT')

        # Check that the underlying tkinter.Button is properly configured.
        self.assertEqual(expandingbutton.master, text_widget)
        self.assertTrue('50 lines' in expandingbutton.cget('text'))

        # Check that the text widget still contains no text.
        self.assertEqual(text_widget.get('1.0', 'end'), '\n')

        # Check that the mouse events are bound.
        self.assertIn('<Double-Button-1>', expandingbutton.bind())
        right_button_code = '<Button-%s>' % ('2' if macosx.isAquaTk() else '3')
        self.assertIn(right_button_code, expandingbutton.bind())

        # Check that ToolTip was called once, with appropriate values.
        self.assertEqual(MockHovertip.call_count, 1)
        MockHovertip.assert_called_with(expandingbutton, ANY, hover_delay=ANY)

        # Check that 'right-click' appears in the tooltip text.
        tooltip_text = MockHovertip.call_args[0][1]
        self.assertIn('right-click', tooltip_text.lower())

    def test_expand(self):
        """Test the expand event."""
        squeezer = self.make_mock_squeezer()
        expandingbutton = ExpandingButton('TEXT', 'TAGS', 50, squeezer)

        # Insert the button into the text widget
        # (this is normally done by the Squeezer class).
        text_widget = expandingbutton.text
        text_widget.window_create("1.0", window=expandingbutton)

        # Set base_text to the text widget, so that changes are actually
        # made to it (by ExpandingButton) and we can inspect these
        # changes afterwards.
        expandingbutton.base_text = expandingbutton.text

        # trigger the expand event
        retval = expandingbutton.expand(event=Mock())
        self.assertEqual(retval, None)

        # Check that the text was inserted into the text widget.
        self.assertEqual(text_widget.get('1.0', 'end'), 'TEXT\n')

        # Check that the 'TAGS' tag was set on the inserted text.
        text_end_index = text_widget.index('end-1c')
        self.assertEqual(text_widget.get('1.0', text_end_index), 'TEXT')
        self.assertEqual(text_widget.tag_nextrange('TAGS', '1.0'),
                          ('1.0', text_end_index))

        # Check that the button removed itself from squeezer.expandingbuttons.
        self.assertEqual(squeezer.expandingbuttons.remove.call_count, 1)
        squeezer.expandingbuttons.remove.assert_called_with(expandingbutton)

    def test_expand_dangerous_oupput(self):
        """Test that expanding very long output asks user for confirmation."""
        squeezer = self.make_mock_squeezer()
        text = 'a' * 10**5
        expandingbutton = ExpandingButton(text, 'TAGS', 50, squeezer)
        expandingbutton.set_is_dangerous()
        self.assertTrue(expandingbutton.is_dangerous)

        # Insert the button into the text widget
        # (this is normally done by the Squeezer class).
        text_widget = expandingbutton.text
        text_widget.window_create("1.0", window=expandingbutton)

        # Set base_text to the text widget, so that changes are actually
        # made to it (by ExpandingButton) and we can inspect these
        # changes afterwards.
        expandingbutton.base_text = expandingbutton.text

        # Patch the message box module to always return False.
        with patch('idlelib.squeezer.tkMessageBox') as mock_msgbox:
            mock_msgbox.askokcancel.return_value = False
            mock_msgbox.askyesno.return_value = False
            # Trigger the expand event.
            retval = expandingbutton.expand(event=Mock())

        # Check that the event chain was broken and no text was inserted.
        self.assertEqual(retval, 'break')
        self.assertEqual(expandingbutton.text.get('1.0', 'end-1c'), '')

        # Patch the message box module to always return True.
        with patch('idlelib.squeezer.tkMessageBox') as mock_msgbox:
            mock_msgbox.askokcancel.return_value = True
            mock_msgbox.askyesno.return_value = True
            # Trigger the expand event.
            retval = expandingbutton.expand(event=Mock())

        # Check that the event chain wasn't broken and the text was inserted.
        self.assertEqual(retval, None)
        self.assertEqual(expandingbutton.text.get('1.0', 'end-1c'), text)

    def test_copy(self):
        """Test the copy event."""
        # Testing with the actual clipboard proved problematic, so this
        # test replaces the clipboard manipulation functions with mocks
        # and checks that they are called appropriately.
        squeezer = self.make_mock_squeezer()
        expandingbutton = ExpandingButton('TEXT', 'TAGS', 50, squeezer)
        expandingbutton.clipboard_clear = Mock()
        expandingbutton.clipboard_append = Mock()

        # Trigger the copy event.
        retval = expandingbutton.copy(event=Mock())
        self.assertEqual(retval, None)

        # Vheck that the expanding button called clipboard_clear() and
        # clipboard_append('TEXT') once each.
        self.assertEqual(expandingbutton.clipboard_clear.call_count, 1)
        self.assertEqual(expandingbutton.clipboard_append.call_count, 1)
        expandingbutton.clipboard_append.assert_called_with('TEXT')

    def test_view(self):
        """Test the view event."""
        squeezer = self.make_mock_squeezer()
        expandingbutton = ExpandingButton('TEXT', 'TAGS', 50, squeezer)
        expandingbutton.selection_own = Mock()

        with patch('idlelib.squeezer.view_text', autospec=view_text)\
                as mock_view_text:
            # Trigger the view event.
            expandingbutton.view(event=Mock())

            # Check that the expanding button called view_text.
            self.assertEqual(mock_view_text.call_count, 1)

            # Check that the proper text was passed.
            self.assertEqual(mock_view_text.call_args[0][2], 'TEXT')

    def test_rmenu(self):
        """Test the context menu."""
        squeezer = self.make_mock_squeezer()
        expandingbutton = ExpandingButton('TEXT', 'TAGS', 50, squeezer)
        with patch('tkinter.Menu') as mock_Menu:
            mock_menu = Mock()
            mock_Menu.return_value = mock_menu
            mock_event = Mock()
            mock_event.x = 10
            mock_event.y = 10
            expandingbutton.context_menu_event(event=mock_event)
            self.assertEqual(mock_menu.add_command.call_count,
                             len(expandingbutton.rmenu_specs))
            for label, *data in expandingbutton.rmenu_specs:
                mock_menu.add_command.assert_any_call(label=label, command=ANY)


if __name__ == '__main__':
    unittest.main(verbosity=2)