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✏️ test_webbrowser.py

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import webbrowser
import unittest
import os
import sys
import subprocess
from unittest import mock
from test import support

URL = 'http://www.example.com'
CMD_NAME = 'test'

class PopenMock(mock.MagicMock):

def poll(self):
        return 0

def wait(self, seconds=None):
        return 0

class CommandTestMixin:

def _test(self, meth, *, args=[URL], kw={}, options, arguments):
        """Given a web browser instance method name along with arguments and
        keywords for same (which defaults to the single argument URL), creates
        a browser instance from the class pointed to by self.browser, calls the
        indicated instance method with the indicated arguments, and compares
        the resulting options and arguments passed to Popen by the browser
        instance against the 'options' and 'args' lists.  Options are compared
        in a position independent fashion, and the arguments are compared in
        sequence order to whatever is left over after removing the options.

"""
        popen = PopenMock()
        support.patch(self, subprocess, 'Popen', popen)
        browser = self.browser_class(name=CMD_NAME)
        getattr(browser, meth)(*args, **kw)
        popen_args = subprocess.Popen.call_args[0][0]
        self.assertEqual(popen_args[0], CMD_NAME)
        popen_args.pop(0)
        for option in options:
            self.assertIn(option, popen_args)
            popen_args.pop(popen_args.index(option))
        self.assertEqual(popen_args, arguments)

class GenericBrowserCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.GenericBrowser

def test_open(self):
        self._test('open',
                   options=[],
                   arguments=[URL])

class BackgroundBrowserCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.BackgroundBrowser

def test_open(self):
        self._test('open',
                   options=[],
                   arguments=[URL])

class ChromeCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.Chrome

def test_open(self):
        self._test('open',
                   options=[],
                   arguments=[URL])

def test_open_with_autoraise_false(self):
        self._test('open', kw=dict(autoraise=False),
                   options=[],
                   arguments=[URL])

def test_open_new(self):
        self._test('open_new',
                   options=['--new-window'],
                   arguments=[URL])

def test_open_new_tab(self):
        self._test('open_new_tab',
                   options=[],
                   arguments=[URL])

class MozillaCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.Mozilla

def test_open(self):
        self._test('open',
                   options=[],
                   arguments=[URL])

def test_open_with_autoraise_false(self):
        self._test('open', kw=dict(autoraise=False),
                   options=[],
                   arguments=[URL])

def test_open_new(self):
        self._test('open_new',
                   options=[],
                   arguments=['-new-window', URL])

def test_open_new_tab(self):
        self._test('open_new_tab',
                   options=[],
                   arguments=['-new-tab', URL])

class NetscapeCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.Netscape

def test_open(self):
        self._test('open',
                   options=['-raise', '-remote'],
                   arguments=['openURL({})'.format(URL)])

def test_open_with_autoraise_false(self):
        self._test('open', kw=dict(autoraise=False),
                   options=['-noraise', '-remote'],
                   arguments=['openURL({})'.format(URL)])

def test_open_new(self):
        self._test('open_new',
                   options=['-raise', '-remote'],
                   arguments=['openURL({},new-window)'.format(URL)])

def test_open_new_tab(self):
        self._test('open_new_tab',
                   options=['-raise', '-remote'],
                   arguments=['openURL({},new-tab)'.format(URL)])

class GaleonCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.Galeon

def test_open(self):
        self._test('open',
                   options=['-n'],
                   arguments=[URL])

def test_open_with_autoraise_false(self):
        self._test('open', kw=dict(autoraise=False),
                   options=['-noraise', '-n'],
                   arguments=[URL])

def test_open_new(self):
        self._test('open_new',
                   options=['-w'],
                   arguments=[URL])

def test_open_new_tab(self):
        self._test('open_new_tab',
                   options=['-w'],
                   arguments=[URL])

class OperaCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.Opera

def test_open(self):
        self._test('open',
                   options=[],
                   arguments=[URL])

def test_open_with_autoraise_false(self):
        self._test('open', kw=dict(autoraise=False),
                   options=[],
                   arguments=[URL])

def test_open_new(self):
        self._test('open_new',
                   options=['--new-window'],
                   arguments=[URL])

def test_open_new_tab(self):
        self._test('open_new_tab',
                   options=[],
                   arguments=[URL])

class ELinksCommandTest(CommandTestMixin, unittest.TestCase):

browser_class = webbrowser.Elinks

def test_open(self):
        self._test('open', options=['-remote'],
                           arguments=['openURL({})'.format(URL)])

def test_open_with_autoraise_false(self):
        self._test('open',
                   options=['-remote'],
                   arguments=['openURL({})'.format(URL)])

def test_open_new(self):
        self._test('open_new',
                   options=['-remote'],
                   arguments=['openURL({},new-window)'.format(URL)])

def test_open_new_tab(self):
        self._test('open_new_tab',
                   options=['-remote'],
                   arguments=['openURL({},new-tab)'.format(URL)])

class BrowserRegistrationTest(unittest.TestCase):

def setUp(self):
        # Ensure we don't alter the real registered browser details
        self._saved_tryorder = webbrowser._tryorder
        webbrowser._tryorder = []
        self._saved_browsers = webbrowser._browsers
        webbrowser._browsers = {}

def tearDown(self):
        webbrowser._tryorder = self._saved_tryorder
        webbrowser._browsers = self._saved_browsers

def _check_registration(self, preferred):
        class ExampleBrowser:
            pass

expected_tryorder = []
        expected_browsers = {}

self.assertEqual(webbrowser._tryorder, expected_tryorder)
        self.assertEqual(webbrowser._browsers, expected_browsers)

webbrowser.register('Example1', ExampleBrowser)
        expected_tryorder = ['Example1']
        expected_browsers['example1'] = [ExampleBrowser, None]
        self.assertEqual(webbrowser._tryorder, expected_tryorder)
        self.assertEqual(webbrowser._browsers, expected_browsers)

instance = ExampleBrowser()
        if preferred is not None:
            webbrowser.register('example2', ExampleBrowser, instance,
                                preferred=preferred)
        else:
            webbrowser.register('example2', ExampleBrowser, instance)
        if preferred:
            expected_tryorder = ['example2', 'Example1']
        else:
            expected_tryorder = ['Example1', 'example2']
        expected_browsers['example2'] = [ExampleBrowser, instance]
        self.assertEqual(webbrowser._tryorder, expected_tryorder)
        self.assertEqual(webbrowser._browsers, expected_browsers)

def test_register(self):
        self._check_registration(preferred=False)

def test_register_default(self):
        self._check_registration(preferred=None)

def test_register_preferred(self):
        self._check_registration(preferred=True)

class ImportTest(unittest.TestCase):
    def test_register(self):
        webbrowser = support.import_fresh_module('webbrowser')
        self.assertIsNone(webbrowser._tryorder)
        self.assertFalse(webbrowser._browsers)

class ExampleBrowser:
            pass
        webbrowser.register('Example1', ExampleBrowser)
        self.assertTrue(webbrowser._tryorder)
        self.assertEqual(webbrowser._tryorder[-1], 'Example1')
        self.assertTrue(webbrowser._browsers)
        self.assertIn('example1', webbrowser._browsers)
        self.assertEqual(webbrowser._browsers['example1'], [ExampleBrowser, None])

def test_get(self):
        webbrowser = support.import_fresh_module('webbrowser')
        self.assertIsNone(webbrowser._tryorder)
        self.assertFalse(webbrowser._browsers)

with self.assertRaises(webbrowser.Error):
            webbrowser.get('fakebrowser')
        self.assertIsNotNone(webbrowser._tryorder)

def test_synthesize(self):
        webbrowser = support.import_fresh_module('webbrowser')
        name = os.path.basename(sys.executable).lower()
        webbrowser.register(name, None, webbrowser.GenericBrowser(name))
        webbrowser.get(sys.executable)

def test_environment(self):
        webbrowser = support.import_fresh_module('webbrowser')
        try:
            browser = webbrowser.get().name
        except (webbrowser.Error, AttributeError) as err:
            self.skipTest(str(err))
        with support.EnvironmentVarGuard() as env:
            env["BROWSER"] = browser
            webbrowser = support.import_fresh_module('webbrowser')
            webbrowser.get()

def test_environment_preferred(self):
        webbrowser = support.import_fresh_module('webbrowser')
        try:
            webbrowser.get()
            least_preferred_browser = webbrowser.get(webbrowser._tryorder[-1]).name
        except (webbrowser.Error, AttributeError, IndexError) as err:
            self.skipTest(str(err))

with support.EnvironmentVarGuard() as env:
            env["BROWSER"] = least_preferred_browser
            webbrowser = support.import_fresh_module('webbrowser')
            self.assertEqual(webbrowser.get().name, least_preferred_browser)

with support.EnvironmentVarGuard() as env:
            env["BROWSER"] = sys.executable
            webbrowser = support.import_fresh_module('webbrowser')
            self.assertEqual(webbrowser.get().name, sys.executable)

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

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✏️ test_webbrowser.py