Lib/test/test_curses.py

#
# Test script for the curses module
#
# This script doesn't actually display anything very coherent. but it
# does call (nearly) every method and function.
#
# Functions not tested: {def,reset}_{shell,prog}_mode, getch(), getstr(),
# init_color()
# Only called, not tested: getmouse(), ungetmouse()
#

import os
import sys
import tempfile
import unittest

from test.support import requires, import_module, verbose

# Optionally test curses module.  This currently requires that the
# 'curses' resource be given on the regrtest command line using the -u
# option.  If not available, nothing after this line will be executed.
import inspect
requires('curses')

# If either of these don't exist, skip the tests.
curses = import_module('curses')
import_module('curses.panel')
import_module('curses.ascii')

def requires_curses_func(name):
    return unittest.skipUnless(hasattr(curses, name),
                               'requires curses.%s' % name)

term = os.environ.get('TERM')

# If newterm was supported we could use it instead of initscr and not exit
@unittest.skipIf(not term or term == 'unknown',
                 "$TERM=%r, calling initscr() may cause exit" % term)
@unittest.skipIf(sys.platform == "cygwin",
                 "cygwin's curses mostly just hangs")
class TestCurses(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        if not sys.__stdout__.isatty():
            # Temporary skip tests on non-tty
            raise unittest.SkipTest('sys.__stdout__ is not a tty')
            cls.tmp = tempfile.TemporaryFile()
            fd = cls.tmp.fileno()
        else:
            cls.tmp = None
            fd = sys.__stdout__.fileno()
        # testing setupterm() inside initscr/endwin
        # causes terminal breakage
        curses.setupterm(fd=fd)

    @classmethod
    def tearDownClass(cls):
        if cls.tmp:
            cls.tmp.close()
            del cls.tmp

    def setUp(self):
        if verbose:
            # just to make the test output a little more readable
            print()
        self.stdscr = curses.initscr()
        curses.savetty()

    def tearDown(self):
        curses.resetty()
        curses.endwin()

    def test_window_funcs(self):
        "Test the methods of windows"
        stdscr = self.stdscr
        win = curses.newwin(10,10)
        win = curses.newwin(5,5, 5,5)
        win2 = curses.newwin(15,15, 5,5)

        for meth in [stdscr.addch, stdscr.addstr]:
            for args in [('a'), ('a', curses.A_BOLD),
                         (4,4, 'a'), (5,5, 'a', curses.A_BOLD)]:
                with self.subTest(meth=meth.__qualname__, args=args):
                    meth(*args)

        for meth in [stdscr.box, stdscr.clear, stdscr.clrtobot,
                     stdscr.clrtoeol, stdscr.cursyncup, stdscr.delch,
                     stdscr.deleteln, stdscr.erase, stdscr.getbegyx,
                     stdscr.getbkgd, stdscr.getkey, stdscr.getmaxyx,
                     stdscr.getparyx, stdscr.getyx, stdscr.inch,
                     stdscr.insertln, stdscr.instr, stdscr.is_wintouched,
                     win.noutrefresh, stdscr.redrawwin, stdscr.refresh,
                     stdscr.standout, stdscr.standend, stdscr.syncdown,
                     stdscr.syncup, stdscr.touchwin, stdscr.untouchwin]:
            with self.subTest(meth=meth.__qualname__):
                meth()

        stdscr.addnstr('1234', 3)
        stdscr.addnstr('1234', 3, curses.A_BOLD)
        stdscr.addnstr(4,4, '1234', 3)
        stdscr.addnstr(5,5, '1234', 3, curses.A_BOLD)

        stdscr.attron(curses.A_BOLD)
        stdscr.attroff(curses.A_BOLD)
        stdscr.attrset(curses.A_BOLD)
        stdscr.bkgd(' ')
        stdscr.bkgd(' ', curses.A_REVERSE)
        stdscr.bkgdset(' ')
        stdscr.bkgdset(' ', curses.A_REVERSE)

        win.border(65, 66, 67, 68,
                   69, 70, 71, 72)
        win.border('|', '!', '-', '_',
                   '+', '\\', '#', '/')
        with self.assertRaises(TypeError,
                               msg="Expected win.border() to raise TypeError"):
            win.border(65, 66, 67, 68,
                       69, [], 71, 72)

        stdscr.clearok(1)

        win4 = stdscr.derwin(2,2)
        win4 = stdscr.derwin(1,1, 5,5)
        win4.mvderwin(9,9)

        stdscr.echochar('a')
        stdscr.echochar('a', curses.A_BOLD)
        stdscr.hline('-', 5)
        stdscr.hline('-', 5, curses.A_BOLD)
        stdscr.hline(1,1,'-', 5)
        stdscr.hline(1,1,'-', 5, curses.A_BOLD)

        stdscr.idcok(1)
        stdscr.idlok(1)
        stdscr.immedok(1)
        stdscr.insch('c')
        stdscr.insdelln(1)
        stdscr.insnstr('abc', 3)
        stdscr.insnstr('abc', 3, curses.A_BOLD)
        stdscr.insnstr(5, 5, 'abc', 3)
        stdscr.insnstr(5, 5, 'abc', 3, curses.A_BOLD)

        stdscr.insstr('def')
        stdscr.insstr('def', curses.A_BOLD)
        stdscr.insstr(5, 5, 'def')
        stdscr.insstr(5, 5, 'def', curses.A_BOLD)
        stdscr.is_linetouched(0)
        stdscr.keypad(1)
        stdscr.leaveok(1)
        stdscr.move(3,3)
        win.mvwin(2,2)
        stdscr.nodelay(1)
        stdscr.notimeout(1)
        win2.overlay(win)
        win2.overwrite(win)
        win2.overlay(win, 1, 2, 2, 1, 3, 3)
        win2.overwrite(win, 1, 2, 2, 1, 3, 3)
        stdscr.redrawln(1,2)

        stdscr.scrollok(1)
        stdscr.scroll()
        stdscr.scroll(2)
        stdscr.scroll(-3)

        stdscr.move(12, 2)
        stdscr.setscrreg(10,15)
        win3 = stdscr.subwin(10,10)
        win3 = stdscr.subwin(10,10, 5,5)
        stdscr.syncok(1)
        stdscr.timeout(5)
        stdscr.touchline(5,5)
        stdscr.touchline(5,5,0)
        stdscr.vline('a', 3)
        stdscr.vline('a', 3, curses.A_STANDOUT)
        stdscr.chgat(5, 2, 3, curses.A_BLINK)
        stdscr.chgat(3, curses.A_BOLD)
        stdscr.chgat(5, 8, curses.A_UNDERLINE)
        stdscr.chgat(curses.A_BLINK)
        stdscr.refresh()

        stdscr.vline(1,1, 'a', 3)
        stdscr.vline(1,1, 'a', 3, curses.A_STANDOUT)

        if hasattr(curses, 'resize'):
            stdscr.resize()
        if hasattr(curses, 'enclose'):
            stdscr.enclose()


    def test_module_funcs(self):
        "Test module-level functions"
        for func in [curses.baudrate, curses.beep, curses.can_change_color,
                     curses.cbreak, curses.def_prog_mode, curses.doupdate,
                     curses.filter, curses.flash, curses.flushinp,
                     curses.has_colors, curses.has_ic, curses.has_il,
                     curses.isendwin, curses.killchar, curses.longname,
                     curses.nocbreak, curses.noecho, curses.nonl,
                     curses.noqiflush, curses.noraw,
                     curses.reset_prog_mode, curses.termattrs,
                     curses.termname, curses.erasechar, curses.getsyx]:
            with self.subTest(func=func.__qualname__):
                func()

        # Functions that actually need arguments
        if curses.tigetstr("cnorm"):
            curses.curs_set(1)
        curses.delay_output(1)
        curses.echo() ; curses.echo(1)

        with tempfile.TemporaryFile() as f:
            self.stdscr.putwin(f)
            f.seek(0)
            curses.getwin(f)

        curses.halfdelay(1)
        curses.intrflush(1)
        curses.meta(1)
        curses.napms(100)
        curses.newpad(50,50)
        win = curses.newwin(5,5)
        win = curses.newwin(5,5, 1,1)
        curses.nl() ; curses.nl(1)
        curses.putp(b'abc')
        curses.qiflush()
        curses.raw() ; curses.raw(1)
        curses.setsyx(5,5)
        curses.tigetflag('hc')
        curses.tigetnum('co')
        curses.tigetstr('cr')
        curses.tparm(b'cr')
        curses.typeahead(sys.__stdin__.fileno())
        curses.unctrl('a')
        curses.ungetch('a')
        curses.use_env(1)

    # Functions only available on a few platforms
    def test_colors_funcs(self):
        if not curses.has_colors():
            self.skip('requires colors support')
        curses.start_color()
        curses.init_pair(2, 1,1)
        curses.color_content(1)
        curses.color_pair(2)
        curses.pair_content(curses.COLOR_PAIRS - 1)
        curses.pair_number(0)

        if hasattr(curses, 'use_default_colors'):
            curses.use_default_colors()

    @requires_curses_func('keyname')
    def test_keyname(self):
        curses.keyname(13)

    @requires_curses_func('has_key')
    def test_has_key(self):
        curses.has_key(13)

    @requires_curses_func('getmouse')
    def test_getmouse(self):
        (availmask, oldmask) = curses.mousemask(curses.BUTTON1_PRESSED)
        if availmask == 0:
            self.skip('mouse stuff not available')
        curses.mouseinterval(10)
        # just verify these don't cause errors
        curses.ungetmouse(0, 0, 0, 0, curses.BUTTON1_PRESSED)
        m = curses.getmouse()

    def test_userptr_without_set(self):
        w = curses.newwin(10, 10)
        p = curses.panel.new_panel(w)
        # try to access userptr() before calling set_userptr() -- segfaults
        with self.assertRaises(curses.panel.error,
                               msg='userptr should fail since not set'):
            p.userptr()

    def test_userptr_memory_leak(self):
        w = curses.newwin(10, 10)
        p = curses.panel.new_panel(w)
        obj = object()
        nrefs = sys.getrefcount(obj)
        for i in range(100):
            p.set_userptr(obj)

        p.set_userptr(None)
        self.assertEqual(sys.getrefcount(obj), nrefs,
                         "set_userptr leaked references")

    def test_userptr_segfault(self):
        panel = curses.panel.new_panel(self.stdscr)
        class A:
            def __del__(self):
                panel.set_userptr(None)
        panel.set_userptr(A())
        panel.set_userptr(None)

    def test_new_curses_panel(self):
        panel = curses.panel.new_panel(self.stdscr)
        self.assertRaises(TypeError, type(panel))

    @requires_curses_func('is_term_resized')
    def test_is_term_resized(self):
        curses.is_term_resized(*self.stdscr.getmaxyx())

    @requires_curses_func('resize_term')
    def test_resize_term(self):
        curses.resize_term(*self.stdscr.getmaxyx())

    @requires_curses_func('resizeterm')
    def test_resizeterm(self):
        stdscr = self.stdscr
        lines, cols = curses.LINES, curses.COLS
        new_lines = lines - 1
        new_cols = cols + 1
        curses.resizeterm(new_lines, new_cols)

        self.assertEqual(curses.LINES, new_lines)
        self.assertEqual(curses.COLS, new_cols)

    def test_issue6243(self):
        curses.ungetch(1025)
        self.stdscr.getkey()

    @requires_curses_func('unget_wch')
    def test_unget_wch(self):
        stdscr = self.stdscr
        encoding = stdscr.encoding
        for ch in ('a', '\xe9', '\u20ac', '\U0010FFFF'):
            try:
                ch.encode(encoding)
            except UnicodeEncodeError:
                continue
            try:
                curses.unget_wch(ch)
            except Exception as err:
                self.fail("unget_wch(%a) failed with encoding %s: %s"
                          % (ch, stdscr.encoding, err))
            read = stdscr.get_wch()
            self.assertEqual(read, ch)

            code = ord(ch)
            curses.unget_wch(code)
            read = stdscr.get_wch()
            self.assertEqual(read, ch)

    def test_issue10570(self):
        b = curses.tparm(curses.tigetstr("cup"), 5, 3)
        self.assertIs(type(b), bytes)

    def test_encoding(self):
        stdscr = self.stdscr
        import codecs
        encoding = stdscr.encoding
        codecs.lookup(encoding)
        with self.assertRaises(TypeError):
            stdscr.encoding = 10
        stdscr.encoding = encoding
        with self.assertRaises(TypeError):
            del stdscr.encoding

    def test_issue21088(self):
        stdscr = self.stdscr
        #
        # http://bugs.python.org/issue21088
        #
        # the bug:
        # when converting curses.window.addch to Argument Clinic
        # the first two parameters were switched.

        # if someday we can represent the signature of addch
        # we will need to rewrite this test.
        try:
            signature = inspect.signature(stdscr.addch)
            self.assertFalse(signature)
        except ValueError:
            # not generating a signature is fine.
            pass

        # So.  No signature for addch.
        # But Argument Clinic gave us a human-readable equivalent
        # as the first line of the docstring.  So we parse that,
        # and ensure that the parameters appear in the correct order.
        # Since this is parsing output from Argument Clinic, we can
        # be reasonably certain the generated parsing code will be
        # correct too.
        human_readable_signature = stdscr.addch.__doc__.split("\n")[0]
        self.assertIn("[y, x,]", human_readable_signature)


class MiscTests(unittest.TestCase):

    def test_update_lines_cols(self):
        # this doesn't actually test that LINES and COLS are updated,
        # because we can't automate changing them. See Issue #4254 for
        # a manual test script. We can only test that the function
        # can be called.
        curses.update_lines_cols()


class TestAscii(unittest.TestCase):

    def test_unctrl(self):
        unctrl = curses.ascii.unctrl
        self.assertEqual(unctrl('a'), 'a')
        self.assertEqual(unctrl('A'), 'A')
        self.assertEqual(unctrl(';'), ';')
        self.assertEqual(unctrl(' '), ' ')
        self.assertEqual(unctrl('\x7f'), '^?')
        self.assertEqual(unctrl('\n'), '^J')
        self.assertEqual(unctrl('\0'), '^@')
        # Meta-bit characters
        self.assertEqual(unctrl('\x8a'), '!^J')
        self.assertEqual(unctrl('\xc1'), '!A')


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