Fixed several hack classes build to simulate file descriptors

Now there is a single class, StdSim in utils.py, which is intended to simulate stdout and stderr file objects.

This class replaced the following:
- pyscript_bridge.py::CopyStream
- transcript.py::OutputTrap
- conftest.py::StdOut

8 files changed, 103 insertions, 125 deletions

diff --git a/tests/conftest.py b/tests/conftest.py
index a85135b9..561f281b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -12,6 +12,7 @@ from unittest import mock
 from pytest import fixture
 
 import cmd2
+from cmd2.utils import StdSim
 
 # Prefer statically linked gnureadline if available (for macOS compatibility due to issues with libedit)
 try:
@@ -115,21 +116,6 @@ timing: False             # Report execution times
 """.format(color_str)
 
 
-class StdOut(object):
-    """ Toy class for replacing self.stdout in cmd2.Cmd instances for unit testing. """
-    def __init__(self):
-        self.buffer = ''
-
-    def write(self, s):
-        self.buffer += s
-
-    def read(self):
-        raise NotImplementedError
-
-    def clear(self):
-        self.buffer = ''
-
-
 def normalize(block):
     """ Normalize a block of text to perform comparison.
 
@@ -142,10 +128,10 @@ def normalize(block):
 
 
 def run_cmd(app, cmd):
-    """ Clear StdOut buffer, run the command, extract the buffer contents, """
+    """ Clear StdSim buffer, run the command, extract the buffer contents, """
     app.stdout.clear()
     app.onecmd_plus_hooks(cmd)
-    out = app.stdout.buffer
+    out = app.stdout.getvalue()
     app.stdout.clear()
     return normalize(out)
 
@@ -153,7 +139,7 @@ def run_cmd(app, cmd):
 @fixture
 def base_app():
     c = cmd2.Cmd()
-    c.stdout = StdOut()
+    c.stdout = StdSim(c.stdout)
     return c
 
 
diff --git a/tests/test_argparse.py b/tests/test_argparse.py
index 469cbe76..bf20710b 100644
--- a/tests/test_argparse.py
+++ b/tests/test_argparse.py
@@ -6,9 +6,9 @@ import argparse
 import pytest
 
 import cmd2
-from unittest import mock
+from cmd2.utils import StdSim
 
-from .conftest import run_cmd, StdOut
+from .conftest import run_cmd
 
 # Prefer statically linked gnureadline if available (for macOS compatibility due to issues with libedit)
 try:
@@ -115,7 +115,7 @@ class ArgparseApp(cmd2.Cmd):
 @pytest.fixture
 def argparse_app():
     app = ArgparseApp()
-    app.stdout = StdOut()
+    app.stdout = StdSim(app.stdout)
     return app
 
 
@@ -217,12 +217,12 @@ class SubcommandApp(cmd2.Cmd):
             func(self, args)
         else:
             # No subcommand was provided, so call help
-            self.do_help('base')
+            self.do_help(['base'])
 
 @pytest.fixture
 def subcommand_app():
     app = SubcommandApp()
-    app.stdout = StdOut()
+    app.stdout = StdSim(app.stdout)
     return app
 
 
diff --git a/tests/test_autocompletion.py b/tests/test_autocompletion.py
index 8aa26e0e..8035587a 100644
--- a/tests/test_autocompletion.py
+++ b/tests/test_autocompletion.py
@@ -1,3 +1,4 @@
+# coding=utf-8
 """
 Unit/functional testing for argparse completer in cmd2
 
@@ -5,16 +6,17 @@ Copyright 2018 Eric Lin <anselor@gmail.com>
 Released under MIT license, see LICENSE file
 """
 import pytest
-from .conftest import run_cmd, normalize, StdOut, complete_tester
+
+from cmd2.utils import StdSim
+from .conftest import run_cmd, normalize, complete_tester
 
 from examples.tab_autocompletion import TabCompleteExample
 
 @pytest.fixture
 def cmd2_app():
-    c = TabCompleteExample()
-    c.stdout = StdOut()
-
-    return c
+    app = TabCompleteExample()
+    app.stdout = StdSim(app.stdout)
+    return app
 
 
 SUGGEST_HELP = '''Usage: suggest -t {movie, show} [-h] [-d DURATION{1..2}]
diff --git a/tests/test_cmd2.py b/tests/test_cmd2.py
index 1e7e2c3f..4b0687c9 100644
--- a/tests/test_cmd2.py
+++ b/tests/test_cmd2.py
@@ -25,7 +25,7 @@ import cmd2
 from cmd2 import clipboard
 from cmd2 import utils
 from .conftest import run_cmd, normalize, BASE_HELP, BASE_HELP_VERBOSE, \
-    HELP_HISTORY, SHORTCUTS_TXT, SHOW_TXT, SHOW_LONG, StdOut
+    HELP_HISTORY, SHORTCUTS_TXT, SHOW_TXT, SHOW_LONG
 
 
 def test_version(base_app):
@@ -930,7 +930,7 @@ def test_base_cmdloop_with_queue():
     app.use_rawinput = True
     intro = 'Hello World, this is an intro ...'
     app.cmdqueue.append('quit\n')
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
 
     # Need to patch sys.argv so cmd2 doesn't think it was called with arguments equal to the py.test args
     testargs = ["prog"]
@@ -938,7 +938,7 @@ def test_base_cmdloop_with_queue():
     with mock.patch.object(sys, 'argv', testargs):
         # Run the command loop with custom intro
         app.cmdloop(intro=intro)
-    out = app.stdout.buffer
+    out = app.stdout.getvalue()
     assert out == expected
 
 
@@ -947,7 +947,7 @@ def test_base_cmdloop_without_queue():
     app = cmd2.Cmd()
     app.use_rawinput = True
     app.intro = 'Hello World, this is an intro ...'
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
 
     # Mock out the input call so we don't actually wait for a user's response on stdin
     m = mock.MagicMock(name='input', return_value='quit')
@@ -959,7 +959,7 @@ def test_base_cmdloop_without_queue():
     with mock.patch.object(sys, 'argv', testargs):
         # Run the command loop
         app.cmdloop()
-    out = app.stdout.buffer
+    out = app.stdout.getvalue()
     assert out == expected
 
 
@@ -969,7 +969,7 @@ def test_cmdloop_without_rawinput():
     app.use_rawinput = False
     app.echo = False
     app.intro = 'Hello World, this is an intro ...'
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
 
     # Mock out the input call so we don't actually wait for a user's response on stdin
     m = mock.MagicMock(name='input', return_value='quit')
@@ -981,7 +981,7 @@ def test_cmdloop_without_rawinput():
     with mock.patch.object(sys, 'argv', testargs):
         # Run the command loop
         app.cmdloop()
-    out = app.stdout.buffer
+    out = app.stdout.getvalue()
     assert out == expected
 
 
@@ -996,7 +996,7 @@ class HookFailureApp(cmd2.Cmd):
 @pytest.fixture
 def hook_failure():
     app = HookFailureApp()
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_precmd_hook_success(base_app):
@@ -1020,7 +1020,7 @@ class SayApp(cmd2.Cmd):
 def say_app():
     app = SayApp()
     app.allow_cli_args = False
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_interrupt_quit(say_app):
@@ -1034,7 +1034,7 @@ def test_interrupt_quit(say_app):
     say_app.cmdloop()
 
     # And verify the expected output to stdout
-    out = say_app.stdout.buffer
+    out = say_app.stdout.getvalue()
     assert out == 'hello\n'
 
 def test_interrupt_noquit(say_app):
@@ -1048,7 +1048,7 @@ def test_interrupt_noquit(say_app):
     say_app.cmdloop()
 
     # And verify the expected output to stdout
-    out = say_app.stdout.buffer
+    out = say_app.stdout.getvalue()
     assert out == 'hello\n^C\ngoodbye\n'
 
 
@@ -1060,7 +1060,7 @@ class ShellApp(cmd2.Cmd):
 @pytest.fixture
 def shell_app():
     app = ShellApp()
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_default_to_shell_unknown(shell_app):
@@ -1140,7 +1140,7 @@ class HelpApp(cmd2.Cmd):
 @pytest.fixture
 def help_app():
     app = HelpApp()
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_custom_command_help(help_app):
@@ -1203,7 +1203,7 @@ class HelpCategoriesApp(cmd2.Cmd):
 @pytest.fixture
 def helpcat_app():
     app = HelpCategoriesApp()
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_help_cat_base(helpcat_app):
@@ -1296,7 +1296,7 @@ class SelectApp(cmd2.Cmd):
 @pytest.fixture
 def select_app():
     app = SelectApp()
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_select_options(select_app):
@@ -1461,7 +1461,7 @@ class MultilineApp(cmd2.Cmd):
 @pytest.fixture
 def multiline_app():
     app = MultilineApp()
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_multiline_complete_empty_statement_raises_exception(multiline_app):
@@ -1522,7 +1522,7 @@ class CommandResultApp(cmd2.Cmd):
 @pytest.fixture
 def commandresult_app():
     app = CommandResultApp()
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
     return app
 
 def test_commandresult_truthy(commandresult_app):
@@ -1628,7 +1628,7 @@ def piped_rawinput_true(capsys, echo, command):
     # run the cmdloop, which should pull input from our mock
     app._cmdloop()
     out, err = capsys.readouterr()
-    return (app, out)
+    return app, out
 
 # using the decorator puts the original input function back when this unit test returns
 @mock.patch('builtins.input', mock.MagicMock(name='input', side_effect=['set', EOFError]))
@@ -1658,7 +1658,7 @@ def piped_rawinput_false(capsys, echo, command):
     app.echo = echo
     app._cmdloop()
     out, err = capsys.readouterr()
-    return (app, out)
+    return app, out
 
 def test_pseudo_raw_input_piped_rawinput_false_echo_true(capsys):
     command = 'set'
@@ -1715,28 +1715,28 @@ def test_empty_stdin_input():
 def test_poutput_string(base_app):
     msg = 'This is a test'
     base_app.poutput(msg)
-    out = base_app.stdout.buffer
+    out = base_app.stdout.getvalue()
     expected = msg + '\n'
     assert out == expected
 
 def test_poutput_zero(base_app):
     msg = 0
     base_app.poutput(msg)
-    out = base_app.stdout.buffer
+    out = base_app.stdout.getvalue()
     expected = str(msg) + '\n'
     assert out == expected
 
 def test_poutput_empty_string(base_app):
     msg = ''
     base_app.poutput(msg)
-    out = base_app.stdout.buffer
+    out = base_app.stdout.getvalue()
     expected = msg
     assert out == expected
 
 def test_poutput_none(base_app):
     msg = None
     base_app.poutput(msg)
-    out = base_app.stdout.buffer
+    out = base_app.stdout.getvalue()
     expected = ''
     assert out == expected
 
@@ -1826,7 +1826,7 @@ def test_ppaged(base_app):
     msg = 'testing...'
     end = '\n'
     base_app.ppaged(msg)
-    out = base_app.stdout.buffer
+    out = base_app.stdout.getvalue()
     assert out == msg + end
 
 # we override cmd.parseline() so we always get consistent
@@ -1859,14 +1859,14 @@ def test_readline_remove_history_item(base_app):
 def test_onecmd_raw_str_continue(base_app):
     line = "help"
     stop = base_app.onecmd(line)
-    out = base_app.stdout.buffer
+    out = base_app.stdout.getvalue()
     assert not stop
     assert out.strip() == BASE_HELP.strip()
 
 def test_onecmd_raw_str_quit(base_app):
     line = "quit"
     stop = base_app.onecmd(line)
-    out = base_app.stdout.buffer
+    out = base_app.stdout.getvalue()
     assert stop
     assert out == ''
 
@@ -1996,7 +1996,7 @@ def test_exit_code_default(exit_code_repl):
     # Create a cmd2.Cmd() instance and make sure basic settings are like we want for test
     app = exit_code_repl
     app.use_rawinput = True
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
 
     # Mock out the input call so we don't actually wait for a user's response on stdin
     m = mock.MagicMock(name='input', return_value='exit')
@@ -2008,14 +2008,14 @@ def test_exit_code_default(exit_code_repl):
     with mock.patch.object(sys, 'argv', testargs):
         # Run the command loop
         app.cmdloop()
-    out = app.stdout.buffer
+    out = app.stdout.getvalue()
     assert out == expected
 
 def test_exit_code_nonzero(exit_code_repl):
     # Create a cmd2.Cmd() instance and make sure basic settings are like we want for test
     app = exit_code_repl
     app.use_rawinput = True
-    app.stdout = StdOut()
+    app.stdout = utils.StdSim(app.stdout)
 
     # Mock out the input call so we don't actually wait for a user's response on stdin
     m = mock.MagicMock(name='input', return_value='exit 23')
@@ -2028,5 +2028,5 @@ def test_exit_code_nonzero(exit_code_repl):
         # Run the command loop
         with pytest.raises(SystemExit):
             app.cmdloop()
-    out = app.stdout.buffer
+    out = app.stdout.getvalue()
     assert out == expected
diff --git a/tests/test_completion.py b/tests/test_completion.py
index 00a120cc..40299954 100644
--- a/tests/test_completion.py
+++ b/tests/test_completion.py
@@ -15,7 +15,7 @@ import sys
 import pytest
 import cmd2
 from cmd2 import utils
-from .conftest import complete_tester, StdOut
+from .conftest import complete_tester
 from examples.subcommands import SubcommandsExample
 
 # List of strings used with completion functions
@@ -114,13 +114,6 @@ def test_complete_bogus_command(cmd2_app):
     assert first_match is None
 
 
-def test_cmd2_command_completion_single(cmd2_app):
-    text = 'hel'
-    line = text
-    endidx = len(line)
-    begidx = endidx - len(text)
-    assert cmd2_app.completenames(text, line, begidx, endidx) == ['help']
-
 def test_cmd2_command_completion_multiple(cmd2_app):
     text = 'h'
     line = text
@@ -694,8 +687,7 @@ def test_add_opening_quote_delimited_space_in_prefix(cmd2_app):
 @pytest.fixture
 def sc_app():
     c = SubcommandsExample()
-    c.stdout = StdOut()
-
+    c.stdout = utils.StdSim(c.stdout)
     return c
 
 def test_cmd2_subcommand_completion_single_end(sc_app):
@@ -843,7 +835,7 @@ class SubcommandsWithUnknownExample(cmd2.Cmd):
             func(self, args)
         else:
             # No subcommand was provided, so call help
-            self.do_help('base')
+            self.do_help(['base'])
 
 
 @pytest.fixture
diff --git a/tests/test_plugin.py b/tests/test_plugin.py
index e401e837..20f2f32c 100644
--- a/tests/test_plugin.py
+++ b/tests/test_plugin.py
@@ -5,18 +5,14 @@ Test plugin infrastructure and hooks.
 Copyright 2018 Jared Crapo <jared@kotfu.net>
 Released under MIT license, see LICENSE file
 """
-
-from typing import Tuple
-
 import pytest
 
 import cmd2
 from cmd2 import plugin
 
-from .conftest import StdOut
 
 class Plugin:
-    "A mixin class for testing hook registration and calling"
+    """A mixin class for testing hook registration and calling"""
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.reset_counters()
@@ -35,19 +31,19 @@ class Plugin:
     #
     ###
     def prepost_hook_one(self) -> None:
-        "Method used for preloop or postloop hooks"
+        """Method used for preloop or postloop hooks"""
         self.poutput("one")
 
     def prepost_hook_two(self) -> None:
-        "Another method used for preloop or postloop hooks"
+        """Another method used for preloop or postloop hooks"""
         self.poutput("two")
 
     def prepost_hook_too_many_parameters(self, param) -> None:
-        "A preloop or postloop hook with too many parameters"
+        """A preloop or postloop hook with too many parameters"""
         pass
 
     def prepost_hook_with_wrong_return_annotation(self) -> bool:
-        "A preloop or postloop hook with incorrect return type"
+        """A preloop or postloop hook with incorrect return type"""
         pass
 
     ###
@@ -56,7 +52,7 @@ class Plugin:
     #
     ###
     def preparse(self, line: str) -> str:
-        "Preparsing hook"
+        """Preparsing hook"""
         self.called_preparse += 1
         return line
 
@@ -66,44 +62,44 @@ class Plugin:
     #
     ###
     def postparse_hook(self, data: cmd2.plugin.PostparsingData) -> cmd2.plugin.PostparsingData:
-        "A postparsing hook"
+        """A postparsing hook"""
         self.called_postparsing += 1
         return data
 
     def postparse_hook_stop(self, data: cmd2.plugin.PostparsingData) -> cmd2.plugin.PostparsingData:
-        "A postparsing hook with requests application exit"
+        """A postparsing hook with requests application exit"""
         self.called_postparsing += 1
         data.stop = True
         return data
 
     def postparse_hook_emptystatement(self, data: cmd2.plugin.PostparsingData) -> cmd2.plugin.PostparsingData:
-        "A postparsing hook with raises an EmptyStatement exception"
+        """A postparsing hook with raises an EmptyStatement exception"""
         self.called_postparsing += 1
         raise cmd2.EmptyStatement
 
     def postparse_hook_exception(self, data: cmd2.plugin.PostparsingData) -> cmd2.plugin.PostparsingData:
-        "A postparsing hook which raises an exception"
+        """A postparsing hook which raises an exception"""
         self.called_postparsing += 1
         raise ValueError
 
     def postparse_hook_too_many_parameters(self, data1, data2) -> cmd2.plugin.PostparsingData:
-        "A postparsing hook with too many parameters"
+        """A postparsing hook with too many parameters"""
         pass
 
     def postparse_hook_undeclared_parameter_annotation(self, data) -> cmd2.plugin.PostparsingData:
-        "A postparsing hook with an undeclared parameter type"
+        """A postparsing hook with an undeclared parameter type"""
         pass
 
     def postparse_hook_wrong_parameter_annotation(self, data: str) -> cmd2.plugin.PostparsingData:
-        "A postparsing hook with the wrong parameter type"
+        """A postparsing hook with the wrong parameter type"""
         pass
 
     def postparse_hook_undeclared_return_annotation(self, data: cmd2.plugin.PostparsingData):
-        "A postparsing hook with an undeclared return type"
+        """A postparsing hook with an undeclared return type"""
         pass
 
     def postparse_hook_wrong_return_annotation(self, data: cmd2.plugin.PostparsingData) -> str:
-        "A postparsing hook with the wrong return type"
+        """A postparsing hook with the wrong return type"""
         pass
 
     ###
@@ -112,43 +108,43 @@ class Plugin:
     #
     ###
     def precmd(self, statement: cmd2.Statement) -> cmd2.Statement:
-        "Override cmd.Cmd method"
+        """Override cmd.Cmd method"""
         self.called_precmd += 1
         return statement
 
     def precmd_hook(self, data: plugin.PrecommandData) -> plugin.PrecommandData:
-        "A precommand hook"
+        """A precommand hook"""
         self.called_precmd += 1
         return data
 
     def precmd_hook_emptystatement(self, data: plugin.PrecommandData) -> plugin.PrecommandData:
-        "A precommand hook which raises an EmptyStatement exception"
+        """A precommand hook which raises an EmptyStatement exception"""
         self.called_precmd += 1
         raise cmd2.EmptyStatement
 
     def precmd_hook_exception(self, data: plugin.PrecommandData) -> plugin.PrecommandData:
-        "A precommand hook which raises an exception"
+        """A precommand hook which raises an exception"""
         self.called_precmd += 1
         raise ValueError
 
     def precmd_hook_not_enough_parameters(self) -> plugin.PrecommandData:
-        "A precommand hook with no parameters"
+        """A precommand hook with no parameters"""
         pass
 
     def precmd_hook_too_many_parameters(self, one: plugin.PrecommandData, two: str) -> plugin.PrecommandData:
-        "A precommand hook with too many parameters"
+        """A precommand hook with too many parameters"""
         return one
 
     def precmd_hook_no_parameter_annotation(self, data) -> plugin.PrecommandData:
-        "A precommand hook with no type annotation on the parameter"
+        """A precommand hook with no type annotation on the parameter"""
         return data
 
     def precmd_hook_wrong_parameter_annotation(self, data: str) -> plugin.PrecommandData:
-        "A precommand hook with the incorrect type annotation on the parameter"
+        """A precommand hook with the incorrect type annotation on the parameter"""
         return data
 
     def precmd_hook_no_return_annotation(self, data: plugin.PrecommandData):
-        "A precommand hook with no type annotation on the return value"
+        """A precommand hook with no type annotation on the return value"""
         return data
 
     def precmd_hook_wrong_return_annotation(self, data: plugin.PrecommandData) -> cmd2.Statement:
@@ -160,38 +156,38 @@ class Plugin:
     #
     ###
     def postcmd(self, stop: bool, statement: cmd2.Statement) -> bool:
-        "Override cmd.Cmd method"
+        """Override cmd.Cmd method"""
         self.called_postcmd += 1
         return stop
 
     def postcmd_hook(self, data: plugin.PostcommandData) -> plugin.PostcommandData:
-        "A postcommand hook"
+        """A postcommand hook"""
         self.called_postcmd += 1
         return data
 
     def postcmd_hook_exception(self, data: plugin.PostcommandData) -> plugin.PostcommandData:
-        "A postcommand hook with raises an exception"
+        """A postcommand hook with raises an exception"""
         self.called_postcmd += 1
         raise ZeroDivisionError
 
     def postcmd_hook_not_enough_parameters(self) -> plugin.PostcommandData:
-        "A precommand hook with no parameters"
+        """A precommand hook with no parameters"""
         pass
 
     def postcmd_hook_too_many_parameters(self, one: plugin.PostcommandData, two: str) -> plugin.PostcommandData:
-        "A precommand hook with too many parameters"
+        """A precommand hook with too many parameters"""
         return one
 
     def postcmd_hook_no_parameter_annotation(self, data) -> plugin.PostcommandData:
-        "A precommand hook with no type annotation on the parameter"
+        """A precommand hook with no type annotation on the parameter"""
         return data
 
     def postcmd_hook_wrong_parameter_annotation(self, data: str) -> plugin.PostcommandData:
-        "A precommand hook with the incorrect type annotation on the parameter"
+        """A precommand hook with the incorrect type annotation on the parameter"""
         return data
 
     def postcmd_hook_no_return_annotation(self, data: plugin.PostcommandData):
-        "A precommand hook with no type annotation on the return value"
+        """A precommand hook with no type annotation on the return value"""
         return data
 
     def postcmd_hook_wrong_return_annotation(self, data: plugin.PostcommandData) -> cmd2.Statement:
@@ -208,13 +204,13 @@ class Plugin:
         return data
 
     def cmdfinalization_hook_stop(self, data: cmd2.plugin.CommandFinalizationData) -> cmd2.plugin.CommandFinalizationData:
-        "A postparsing hook which requests application exit"
+        """A postparsing hook which requests application exit"""
         self.called_cmdfinalization += 1
         data.stop = True
         return data
 
     def cmdfinalization_hook_exception(self, data: cmd2.plugin.CommandFinalizationData) -> cmd2.plugin.CommandFinalizationData:
-        "A postparsing hook which raises an exception"
+        """A postparsing hook which raises an exception"""
         self.called_cmdfinalization += 1
         raise ValueError
 
@@ -244,7 +240,7 @@ class Plugin:
 
 
 class PluggedApp(Plugin, cmd2.Cmd):
-    "A sample app with a plugin mixed in"
+    """A sample app with a plugin mixed in"""
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
diff --git a/tests/test_pyscript.py b/tests/test_pyscript.py
index 73c1a62a..256e63a7 100644
--- a/tests/test_pyscript.py
+++ b/tests/test_pyscript.py
@@ -1,3 +1,4 @@
+# coding=utf-8
 """
 Unit/functional testing for argparse completer in cmd2
 
@@ -8,24 +9,25 @@ import os
 import pytest
 from cmd2.cmd2 import Cmd, with_argparser
 from cmd2 import argparse_completer
-from .conftest import run_cmd, StdOut
-from cmd2.utils import namedtuple_with_defaults
+from .conftest import run_cmd
+from cmd2.utils import namedtuple_with_defaults, StdSim
+
 
 class PyscriptExample(Cmd):
     ratings_types = ['G', 'PG', 'PG-13', 'R', 'NC-17']
 
     def _do_media_movies(self, args) -> None:
         if not args.command:
-            self.do_help('media movies')
+            self.do_help(['media movies'])
         else:
             print('media movies ' + str(args.__dict__))
 
     def _do_media_shows(self, args) -> None:
         if not args.command:
-            self.do_help('media shows')
+            self.do_help(['media shows'])
 
         if not args.command:
-            self.do_help('media shows')
+            self.do_help(['media shows'])
         else:
             print('media shows ' + str(args.__dict__))
 
@@ -70,7 +72,7 @@ class PyscriptExample(Cmd):
             func(self, args)
         else:
             # No subcommand was provided, so call help
-            self.do_help('media')
+            self.do_help(['media'])
 
     foo_parser = argparse_completer.ACArgumentParser(prog='foo')
     foo_parser.add_argument('-c', dest='counter', action='count')
@@ -114,8 +116,7 @@ class PyscriptExample(Cmd):
 @pytest.fixture
 def ps_app():
     c = PyscriptExample()
-    c.stdout = StdOut()
-
+    c.stdout = StdSim(c.stdout)
     return c
 
 
@@ -131,8 +132,7 @@ class PyscriptCustomNameExample(Cmd):
 @pytest.fixture
 def ps_echo():
     c = PyscriptCustomNameExample()
-    c.stdout = StdOut()
-
+    c.stdout = StdSim(c.stdout)
     return c
 
 
diff --git a/tests/test_transcript.py b/tests/test_transcript.py
index 3caf6a37..f854241b 100644
--- a/tests/test_transcript.py
+++ b/tests/test_transcript.py
@@ -16,8 +16,10 @@ from unittest import mock
 import pytest
 
 import cmd2
-from .conftest import run_cmd, StdOut
+from .conftest import run_cmd
 from cmd2 import transcript
+from cmd2.utils import StdSim
+
 
 class CmdLineApp(cmd2.Cmd):
 
@@ -83,9 +85,9 @@ def test_commands_at_invocation():
     expected = "This is an intro banner ...\nhello\nGracie\n"
     with mock.patch.object(sys, 'argv', testargs):
         app = CmdLineApp()
-        app.stdout = StdOut()
+        app.stdout = StdSim(app.stdout)
         app.cmdloop()
-        out = app.stdout.buffer
+        out = app.stdout.getvalue()
         assert out == expected
 
 @pytest.mark.parametrize('filename,feedback_to_output', [
@@ -129,7 +131,7 @@ def test_transcript(request, capsys, filename, feedback_to_output):
 
 def test_history_transcript(request, capsys):
     app = CmdLineApp()
-    app.stdout = StdOut()
+    app.stdout = StdSim(app.stdout)
     run_cmd(app, 'orate this is\na /multiline/\ncommand;\n')
     run_cmd(app, 'speak /tmp/file.txt is not a regex')
 
@@ -150,13 +152,13 @@ this is a \/multiline\/ command
 
     # read in the transcript created by the history command
     with open(history_fname) as f:
-        transcript = f.read()
+        xscript = f.read()
 
-    assert transcript == expected
+    assert xscript == expected
 
 def test_history_transcript_bad_filename(request, capsys):
     app = CmdLineApp()
-    app.stdout = StdOut()
+    app.stdout = StdSim(app.stdout)
     run_cmd(app, 'orate this is\na /multiline/\ncommand;\n')
     run_cmd(app, 'speak /tmp/file.txt is not a regex')