diff --git a/Lib/test/test_webbrowser.py b/Lib/test/test_webbrowser.py
new file mode 100644
--- /dev/null
+++ b/Lib/test/test_webbrowser.py
@@ -0,0 +1,187 @@
+import webbrowser
+import unittest
+import subprocess
+from unittest import mock
+
+
+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 = mock.patch.object(subprocess, 'Popen', new_callable=PopenMock)
+        popen.start()
+        self.addCleanup(popen.stop)
+        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_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=['-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=['-remote'],
+                   arguments=['openURL({})'.format(URL)])
+
+    def test_open_with_autoraise_false(self):
+        self._test('open', kw=dict(autoraise=False),
+                   options=['-remote', '-noraise'],
+                   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(self):
+        self._test('open_new_tab',
+                   options=['-remote'],
+                   arguments=['openURL({},new-page)'.format(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)])
+
+
+if __name__=='__main__':
+    unittest.main()