Update optparse module and test suite to Optik 1.5a2.

1 files changed, 214 insertions, 192 deletions

diff --git a/Lib/test/test_optparse.py b/Lib/test/test_optparse.py
index 883194e..c02dd10 100644
--- a/Lib/test/test_optparse.py
+++ b/Lib/test/test_optparse.py
@@ -17,10 +17,37 @@ from cStringIO import StringIO
 from pprint import pprint
 from test import test_support
 
-from optparse import (make_option, Option, IndentedHelpFormatter,
-     TitledHelpFormatter, OptionParser, OptionContainer, OptionGroup,
-     SUPPRESS_HELP, SUPPRESS_USAGE, OptionError, OptionConflictError,
-     BadOptionError, OptionValueError, _match_abbrev)
+from optparse import make_option, Option, IndentedHelpFormatter, \
+     TitledHelpFormatter, OptionParser, OptionContainer, OptionGroup, \
+     SUPPRESS_HELP, SUPPRESS_USAGE, OptionError, OptionConflictError, \
+     BadOptionError, OptionValueError, Values, _match_abbrev
+
+# Do the right thing with boolean values for all known Python versions.
+try:
+    True, False
+except NameError:
+    (True, False) = (1, 0)
+
+
+class InterceptedError(Exception):
+    def __init__(self,
+                 error_message=None,
+                 exit_status=None,
+                 exit_message=None):
+        self.error_message = error_message
+        self.exit_status = exit_status
+        self.exit_message = exit_message
+
+    def __str__(self):
+        return self.error_message or self.exit_message or "intercepted error"
+
+class InterceptingOptionParser(OptionParser):
+    def exit(self, status=0, msg=None):
+        raise InterceptedError(exit_status=status, exit_message=msg)
+
+    def error(self, msg):
+        raise InterceptedError(error_message=msg)
+
 
 class BaseTest(unittest.TestCase):
     def assertParseOK(self, args, expected_opts, expected_positional_args):
@@ -58,12 +85,11 @@ Args were %(args)s.""" % locals ())
                      args,
                      kwargs,
                      expected_exception,
-                     expected_output,
-                     get_output=None,
-                     exact_match=False):
-        """Assert the expected exception is raised when calling a function.
-
-        Also check whether the right error message is given for a given error.
+                     expected_message):
+        """
+        Assert that the expected exception is raised when calling a
+        function, and that the right error message is included with
+        that exception.
 
         Arguments:
           func -- the function to call
@@ -71,9 +97,6 @@ Args were %(args)s.""" % locals ())
           kwargs -- keyword arguments to `func`
           expected_exception -- exception that should be raised
           expected_output -- output we expect to see
-          get_output -- function to call to get the output
-          exact_match -- whether output must exactly match expected output,
-            or merely contain it
 
         Returns the exception raised for further testing.
         """
@@ -81,25 +104,18 @@ Args were %(args)s.""" % locals ())
             args = ()
         if kwargs is None:
             kwargs = {}
-        if get_output is None:
-            get_output = self.exception
 
         try:
-            out = func(*args, **kwargs)
+            func(*args, **kwargs)
         except expected_exception, err:
-            actual_output = get_output(err)
-
-            if exact_match:
-                match = actual_output == expected_exception
-            else:
-                match = actual_output.find(expected_output) != -1
-
-            self.assert_(match,
-                         """mismatched output
-expected output:
-'''%(expected_output)s'''
-actual output:
-'''%(actual_output)s'''
+            actual_message = str(err)
+            self.assertEqual(actual_message,
+                             expected_message,
+                             """\
+expected exception message:
+'''%(expected_message)s'''
+actual exception message:
+'''%(actual_message)s'''
 """ % locals())
 
             return err
@@ -110,44 +126,46 @@ with args %(args)r
 and kwargs %(kwargs)r
 """ % locals ())
 
-    # -- Functions to be used as the get_output argument to assertRaises ------
-
-    def exception(self, err):
-        return str(err)
-
-    def redirected_stdout(self, err):
-        return sys.stdout.getvalue()
-
-    def redirected_stderr(self, err):
-        return sys.stderr.getvalue()
 
     # -- Assertions used in more than one class --------------------
 
     def assertParseFail(self, cmdline_args, expected_output):
-        """Assert the parser fails with the expected message."""
-        save_stderr = sys.stderr
+        """
+        Assert the parser fails with the expected message.  Caller
+        must ensure that self.parser is an InterceptingOptionParser.
+        """
         try:
-            sys.stderr = StringIO()
-            self.assertRaises(self.parser.parse_args, (cmdline_args,), None,
-                              SystemExit, expected_output,
-                              self.redirected_stderr)
-        finally:
-            sys.stderr = save_stderr
+            self.parser.parse_args(cmdline_args)
+        except InterceptedError, err:
+            self.assertEqual(err.error_message, expected_output)
+        else:
+            self.assertFalse("expected parse failure")
 
-    def assertStdoutEquals(self, cmdline_args, expected_output):
+    def assertOutput(self,
+                     cmdline_args,
+                     expected_output,
+                     expected_status=0,
+                     expected_error=None):
         """Assert the parser prints the expected output on stdout."""
         save_stdout = sys.stdout
         try:
-            sys.stdout = StringIO()
-            self.assertRaises(self.parser.parse_args, (cmdline_args,), None,
-                              SystemExit, expected_output,
-                              self.redirected_stdout)
-        finally:
-            sys.stdout = save_stdout
+            try:
+                sys.stdout = StringIO()
+                self.parser.parse_args(cmdline_args)
+            finally:
+                output = sys.stdout.getvalue()
+                sys.stdout = save_stdout
+
+        except InterceptedError, err:
+            self.assertEqual(output, expected_output)
+            self.assertEqual(err.exit_status, expected_status)
+            self.assertEqual(err.exit_message, expected_error)
+        else:
+            self.assertFalse("expected parser.exit()")
 
-    def assertTypeError(self, func, expected_output, *args):
-        """Assert a TypeError is raised when executing func."""
-        self.assertRaises(func, args, None, TypeError, expected_output)
+    def assertTypeError(self, func, expected_message, *args):
+        """Assert that TypeError is raised when executing func."""
+        self.assertRaises(func, args, None, TypeError, expected_message)
 
     def assertHelp(self, parser, expected_help):
         actual_help = parser.format_help()
@@ -159,120 +177,133 @@ and kwargs %(kwargs)r
 
 # -- Test make_option() aka Option -------------------------------------
 
-# It's not necessary to test correct options here. All the tests in the
+# It's not necessary to test correct options here.  All the tests in the
 # parser.parse_args() section deal with those, because they're needed
-# there. Duplication makes no sense to me.
+# there.
 
 class TestOptionChecks(BaseTest):
     def setUp(self):
         self.parser = OptionParser(usage=SUPPRESS_USAGE)
 
-    def assertOptionError(self, expected_output, args=[], kwargs={}):
+    def assertOptionError(self, expected_message, args=[], kwargs={}):
         self.assertRaises(make_option, args, kwargs,
-                          OptionError, expected_output)
+                          OptionError, expected_message)
 
     def test_opt_string_empty(self):
         self.assertTypeError(make_option,
                              "at least one option string must be supplied")
 
     def test_opt_string_too_short(self):
-        self.assertOptionError("invalid option string 'b': "
-                               "must be at least two characters long",
-                               ["b"])
+        self.assertOptionError(
+            "invalid option string 'b': must be at least two characters long",
+            ["b"])
 
     def test_opt_string_short_invalid(self):
-        self.assertOptionError("invalid short option string '--': must be "
-                               "of the form -x, (x any non-dash char)",
-                               ["--"])
+        self.assertOptionError(
+            "invalid short option string '--': must be "
+            "of the form -x, (x any non-dash char)",
+            ["--"])
 
     def test_opt_string_long_invalid(self):
-        self.assertOptionError("invalid long option string '---': "
-                               "must start with --, followed by non-dash",
-                               ["---"])
+        self.assertOptionError(
+            "invalid long option string '---': "
+            "must start with --, followed by non-dash",
+            ["---"])
 
     def test_attr_invalid(self):
-        self.assertOptionError("invalid keyword arguments: foo, bar",
-                               ["-b"], {'foo': None, 'bar': None})
+        self.assertOptionError(
+            "option -b: invalid keyword arguments: foo, bar",
+            ["-b"], {'foo': None, 'bar': None})
 
     def test_action_invalid(self):
-        self.assertOptionError("invalid action: 'foo'",
-                               ["-b"], {'action': 'foo'})
+        self.assertOptionError(
+            "option -b: invalid action: 'foo'",
+            ["-b"], {'action': 'foo'})
 
     def test_type_invalid(self):
-        self.assertOptionError("invalid option type: 'foo'",
-                               ["-b"], {'type': 'foo'})
-        self.assertOptionError("invalid option type: 'tuple'",
-                               ["-b"], {'type': tuple})
+        self.assertOptionError(
+            "option -b: invalid option type: 'foo'",
+            ["-b"], {'type': 'foo'})
+        self.assertOptionError(
+            "option -b: invalid option type: 'tuple'",
+            ["-b"], {'type': tuple})
 
     def test_no_type_for_action(self):
-        self.assertOptionError("must not supply a type for action 'count'",
-                               ["-b"], {'action': 'count', 'type': 'int'})
+        self.assertOptionError(
+            "option -b: must not supply a type for action 'count'",
+            ["-b"], {'action': 'count', 'type': 'int'})
 
     def test_no_choices_list(self):
-        self.assertOptionError("must supply a list of "
-                               "choices for type 'choice'",
-                               ["-b", "--bad"], {'type': "choice"})
+        self.assertOptionError(
+            "option -b/--bad: must supply a list of "
+            "choices for type 'choice'",
+            ["-b", "--bad"], {'type': "choice"})
 
     def test_bad_choices_list(self):
         typename = type('').__name__
-        self.assertOptionError("choices must be a list of "
-                               "strings ('%s' supplied)" % typename,
-                               ["-b", "--bad"],
-                               {'type': "choice", 'choices':"bad choices"})
+        self.assertOptionError(
+            "option -b/--bad: choices must be a list of "
+            "strings ('%s' supplied)" % typename,
+            ["-b", "--bad"],
+            {'type': "choice", 'choices':"bad choices"})
 
     def test_no_choices_for_type(self):
-        self.assertOptionError("must not supply choices for type 'int'",
-                               ["-b"], {'type': 'int', 'choices':"bad"})
+        self.assertOptionError(
+            "option -b: must not supply choices for type 'int'",
+            ["-b"], {'type': 'int', 'choices':"bad"})
 
     def test_no_const_for_action(self):
-        self.assertOptionError("'const' must not be supplied for action "
-                               "'store'",
-                               ["-b"], {'action': 'store', 'const': 1})
+        self.assertOptionError(
+            "option -b: 'const' must not be supplied for action 'store'",
+            ["-b"], {'action': 'store', 'const': 1})
 
     def test_no_nargs_for_action(self):
-        self.assertOptionError("'nargs' must not be supplied for action "
-                               "'count'",
-                               ["-b"], {'action': 'count', 'nargs': 2})
+        self.assertOptionError(
+            "option -b: 'nargs' must not be supplied for action 'count'",
+            ["-b"], {'action': 'count', 'nargs': 2})
 
     def test_callback_not_callable(self):
-        self.assertOptionError("callback not callable: 'foo'",
-                               ["-b"], {'action': 'callback',
-                                        'callback': 'foo'})
+        self.assertOptionError(
+            "option -b: callback not callable: 'foo'",
+            ["-b"], {'action': 'callback',
+                     'callback': 'foo'})
 
     def dummy(self):
         pass
 
     def test_callback_args_no_tuple(self):
-        self.assertOptionError("callback_args, if supplied, must be a tuple: "
-                               "not 'foo'",
-                               ["-b"], {'action': 'callback',
-                                        'callback': self.dummy,
-                                        'callback_args': 'foo'})
+        self.assertOptionError(
+            "option -b: callback_args, if supplied, "
+            "must be a tuple: not 'foo'",
+            ["-b"], {'action': 'callback',
+                     'callback': self.dummy,
+                     'callback_args': 'foo'})
 
     def test_callback_kwargs_no_dict(self):
-        self.assertOptionError("callback_kwargs, if supplied, must be a dict: "
-                               "not 'foo'",
-                               ["-b"], {'action': 'callback',
-                                        'callback': self.dummy,
-                                        'callback_kwargs': 'foo'})
+        self.assertOptionError(
+            "option -b: callback_kwargs, if supplied, "
+            "must be a dict: not 'foo'",
+            ["-b"], {'action': 'callback',
+                     'callback': self.dummy,
+                     'callback_kwargs': 'foo'})
 
     def test_no_callback_for_action(self):
-        self.assertOptionError("callback supplied ('foo') for "
-                               "non-callback option",
-                               ["-b"], {'action': 'store',
-                                        'callback': 'foo'})
+        self.assertOptionError(
+            "option -b: callback supplied ('foo') for non-callback option",
+            ["-b"], {'action': 'store',
+                     'callback': 'foo'})
 
     def test_no_callback_args_for_action(self):
-        self.assertOptionError("callback_args supplied for non-callback "
-                               "option",
-                               ["-b"], {'action': 'store',
-                                        'callback_args': 'foo'})
+        self.assertOptionError(
+            "option -b: callback_args supplied for non-callback option",
+            ["-b"], {'action': 'store',
+                     'callback_args': 'foo'})
 
     def test_no_callback_kwargs_for_action(self):
-        self.assertOptionError("callback_kwargs supplied for non-callback "
-                               "option",
-                               ["-b"], {'action': 'store',
-                                        'callback_kwargs': 'foo'})
+        self.assertOptionError(
+            "option -b: callback_kwargs supplied for non-callback option",
+            ["-b"], {'action': 'store',
+                     'callback_kwargs': 'foo'})
 
 class TestOptionParser(BaseTest):
     def setUp(self):
@@ -335,6 +366,27 @@ class TestOptionParser(BaseTest):
         self.assertRaises(self.parser.remove_option, ('foo',), None,
                           ValueError, "no such option 'foo'")
 
+class TestOptionValues(BaseTest):
+    def setUp(self):
+        pass
+
+    def test_basics(self):
+        values = Values()
+        self.assertEqual(vars(values), {})
+        self.assertEqual(values, {})
+        self.assertNotEqual(values, {"foo": "bar"})
+        self.assertNotEqual(values, "")
+
+        dict = {"foo": "bar", "baz": 42}
+        values = Values(defaults=dict)
+        self.assertEqual(vars(values), dict)
+        self.assertEqual(values, dict)
+        self.assertNotEqual(values, {"foo": "bar"})
+        self.assertNotEqual(values, {})
+        self.assertNotEqual(values, "")
+        self.assertNotEqual(values, [])
+
+
 class TestTypeAliases(BaseTest):
     def setUp(self):
         self.parser = OptionParser()
@@ -346,7 +398,7 @@ class TestTypeAliases(BaseTest):
         self.assertEquals(self.parser.get_option("-x").type, "int")
         self.assertEquals(self.parser.get_option("-s").type, "string")
         self.assertEquals(self.parser.get_option("-t").type, "string")
-
+        
 
 # Custom type for testing processing of default values.
 _time_units = { 's' : 1, 'm' : 60, 'h' : 60*60, 'd' : 60*60*24 }
@@ -434,17 +486,16 @@ class TestProgName(BaseTest):
         # Make sure that program name taken from sys.argv[0] by default.
         save_argv = sys.argv[:]
         try:
-            # XXX Should the path be hard-coding forward-slashes?
-            sys.argv[0] = "/foo/bar/baz.py"
+            sys.argv[0] = os.path.join("foo", "bar", "baz.py")
             parser = OptionParser("usage: %prog ...", version="%prog 1.2")
             expected_usage = "usage: baz.py ...\n"
             self.assertUsage(parser, expected_usage)
             self.assertVersion(parser, "baz.py 1.2")
             self.assertHelp(parser,
-                expected_usage + "\n" +
-                "options:\n"
-                "  --version   show program's version number and exit\n"
-                "  -h, --help  show this help message and exit\n")
+                            expected_usage + "\n" +
+                            "options:\n"
+                            "  --version   show program's version number and exit\n"
+                            "  -h, --help  show this help message and exit\n")
         finally:
             sys.argv[:] = save_argv
 
@@ -503,7 +554,7 @@ options:
                                default=None,
                                help=self.file_help)
         self.assertHelp(self.parser, self.expected_help_none)
-
+        
     def test_default_none_2(self):
         self.parser.add_option("-f", "--file",
                                help=self.file_help)
@@ -544,7 +595,8 @@ class TestStandard(BaseTest):
                    make_option("-b", "--boo", type="int", dest='boo'),
                    make_option("--foo", action="append")]
 
-        self.parser = OptionParser(usage=SUPPRESS_USAGE, option_list=options)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE,
+                                               option_list=options)
 
     def test_required_value(self):
         self.assertParseFail(["-a"], "-a option requires an argument")
@@ -707,7 +759,7 @@ class TestBool(BaseTest):
 
 class TestChoice(BaseTest):
     def setUp(self):
-        self.parser = OptionParser(usage=SUPPRESS_USAGE)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE)
         self.parser.add_option("-c", action="store", type="choice",
                                dest="choice", choices=["one", "two", "three"])
 
@@ -730,7 +782,7 @@ class TestChoice(BaseTest):
 
 class TestCount(BaseTest):
     def setUp(self):
-        self.parser = OptionParser(usage=SUPPRESS_USAGE)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE)
         self.v_opt = make_option("-v", action="count", dest="verbose")
         self.parser.add_option(self.v_opt)
         self.parser.add_option("--verbose", type="int", dest="verbose")
@@ -786,9 +838,9 @@ class TestCount(BaseTest):
         self.assertParseOK(["-vvv", "--verbose=2", "-q", "-v"],
                            {'verbose': 1}, [])
 
-class TestNArgs(BaseTest):
+class TestMultipleArgs(BaseTest):
     def setUp(self):
-        self.parser = OptionParser(usage=SUPPRESS_USAGE)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE)
         self.parser.add_option("-p", "--point",
                                action="store", nargs=3, type="float", dest="point")
 
@@ -811,9 +863,9 @@ class TestNArgs(BaseTest):
         self.assertParseFail(["--point", "1.0", "3.5"],
                              "--point option requires 3 arguments")
 
-class TestNArgsAppend(BaseTest):
+class TestMultipleArgsAppend(BaseTest):
     def setUp(self):
-        self.parser = OptionParser(usage=SUPPRESS_USAGE)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE)
         self.parser.add_option("-p", "--point", action="store", nargs=3,
                                type="float", dest="point")
         self.parser.add_option("-f", "--foo", action="append", nargs=2,
@@ -835,14 +887,17 @@ class TestNArgsAppend(BaseTest):
 
 class TestVersion(BaseTest):
     def test_version(self):
-        oldargv = sys.argv[0]
-        sys.argv[0] = "./foo/bar"
-        self.parser = OptionParser(usage=SUPPRESS_USAGE, version="%prog 0.1")
-        self.assertStdoutEquals(["--version"], "bar 0.1\n")
-        sys.argv[0] = oldargv
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE,
+                                               version="%prog 0.1")
+        save_argv = sys.argv[:]
+        try:
+            sys.argv[0] = os.path.join(os.curdir, "foo", "bar")
+            self.assertOutput(["--version"], "bar 0.1\n")
+        finally:
+            sys.argv[:] = save_argv
 
     def test_no_version(self):
-        self.parser = OptionParser(usage=SUPPRESS_USAGE)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE)
         self.assertParseFail(["--version"],
                              "no such option: --version")
 
@@ -900,8 +955,8 @@ class TestOptionGroup(BaseTest):
 
 class TestExtendAddTypes(BaseTest):
     def setUp(self):
-        self.parser = OptionParser(usage=SUPPRESS_USAGE,
-                                   option_class=self.MyOption)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE,
+                                               option_class=self.MyOption)
         self.parser.add_option("-a", None, type="string", dest="a")
         self.parser.add_option("-f", "--file", type="file", dest="file")
 
@@ -1119,7 +1174,8 @@ class TestCallbackVarArgs(BaseTest):
                    make_option("-b", action="store_true", dest="b"),
                    make_option("-c", "--callback", action="callback",
                                callback=self.variable_args, dest="c")]
-        self.parser = OptionParser(usage=SUPPRESS_USAGE, option_list=options)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE,
+                                               option_list=options)
 
     def variable_args (self, option, opt, value, parser):
         self.assert_(value is None)
@@ -1170,7 +1226,8 @@ class ConflictBase(BaseTest):
     def setUp(self):
         options = [make_option("-v", "--verbose", action="count",
                                dest="verbose", help="increment verbosity")]
-        self.parser = OptionParser(usage=SUPPRESS_USAGE, option_list=options)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE,
+                                               option_list=options)
 
     def show_version (self, option, opt, value, parser):
         parser.values.show_version = 1
@@ -1201,41 +1258,6 @@ class TestConflict(ConflictBase):
             ValueError, "invalid conflict_resolution value 'foo'")
 
 
-class TestConflictIgnore(ConflictBase):
-    """Test the old (Optik <= 1.1 behaviour) -- arguably broken, but
-    still available so should be tested.
-    """
-
-    def setUp(self):
-        ConflictBase.setUp(self)
-        self.parser.set_conflict_handler("ignore")
-        self.parser.add_option("-v", "--version", action="callback",
-                          callback=self.show_version, help="show version")
-
-    def test_conflict_ignore(self):
-        v_opt = self.parser.get_option("-v")
-        verbose_opt = self.parser.get_option("--verbose")
-        version_opt = self.parser.get_option("--version")
-
-        self.assert_(v_opt is version_opt)
-        self.assert_(v_opt is not verbose_opt)
-        self.assertEqual(v_opt._long_opts, ["--version"])
-        self.assertEqual(version_opt._short_opts, ["-v"])
-        self.assertEqual(verbose_opt._short_opts, ["-v"])
-
-    def test_conflict_ignore_help(self):
-        self.assertStdoutEquals(["-h"], """\
-options:
-  -v, --verbose  increment verbosity
-  -h, --help     show this help message and exit
-  -v, --version  show version
-""")
-
-    def test_conflict_ignore_short_opt(self):
-        self.assertParseOK(["-v"],
-                           {'show_version': 1, 'verbose': None},
-                           [])
-
 class TestConflictResolve(ConflictBase):
     def setUp(self):
         ConflictBase.setUp(self)
@@ -1257,7 +1279,7 @@ class TestConflictResolve(ConflictBase):
         self.assertEqual(verbose_opt._long_opts, ["--verbose"])
 
     def test_conflict_resolve_help(self):
-        self.assertStdoutEquals(["-h"], """\
+        self.assertOutput(["-h"], """\
 options:
   --verbose      increment verbosity
   -h, --help     show this help message and exit
@@ -1281,7 +1303,7 @@ options:
 
 class TestConflictOverride(BaseTest):
     def setUp(self):
-        self.parser = OptionParser(usage=SUPPRESS_USAGE)
+        self.parser = InterceptingOptionParser(usage=SUPPRESS_USAGE)
         self.parser.set_conflict_handler("resolve")
         self.parser.add_option("-n", "--dry-run",
                                action="store_true", dest="dry_run",
@@ -1296,7 +1318,7 @@ class TestConflictOverride(BaseTest):
         self.assertEqual(opt._long_opts, ["--dry-run"])
 
     def test_conflict_override_help(self):
-        self.assertStdoutEquals(["-h"], """\
+        self.assertOutput(["-h"], """\
 options:
   -h, --help     show this help message and exit
   -n, --dry-run  dry run mode
@@ -1375,16 +1397,16 @@ class TestHelp(BaseTest):
                         help="store FOO in the foo list for later fooing"),
             ]
         os.environ['COLUMNS'] = str(columns)
-        return OptionParser(option_list=options)
+        return InterceptingOptionParser(option_list=options)        
 
     def assertHelpEquals(self, expected_output):
-        # This trick is used to make optparse believe bar.py is being executed.
-        oldargv = sys.argv[0]
-        sys.argv[0] = "./foo/bar.py"
-
-        self.assertStdoutEquals(["-h"], expected_output)
-
-        sys.argv[0] = oldargv
+        save_argv = sys.argv[:]
+        try:
+            # Make optparse believe bar.py is being executed.
+            sys.argv[0] = os.path.join("foo", "bar.py")
+            self.assertOutput(["-h"], expected_output)
+        finally:
+            sys.argv[:] = save_argv
 
     def test_help(self):
         self.assertHelpEquals(_expected_help_basic)
@@ -1441,7 +1463,7 @@ options:
 """)
 
 
-
+        
 
 class TestMatchAbbrev(BaseTest):
     def test_match_abbrev(self):