Rework test_usage_string_fork

tests/test_cli.py

@@ -2,21 +2,20 @@
 
 from __future__ import unicode_literals, print_function
 
+import argparse
+import bumpversion
+import mock
 import os
+import platform
 import pytest
-import sys
-import logging
-import mock
 
-import argparse
+import six
 import subprocess
-from os import curdir, makedirs, chdir, environ
-from os.path import join, curdir, dirname
+from os import environ
 from shlex import split as shlex_split
 from textwrap import dedent
 from functools import partial
 
-import bumpversion
 
 from bumpversion import main, DESCRIPTION, WorkingDirectoryIsDirtyException, \
     split_args_in_optional_and_positional
@@ -154,18 +153,26 @@ def test_usage_string(tmpdir, capsys):
 
     assert EXPECTED_USAGE in out
 
+
 def test_usage_string_fork(tmpdir, capsys):
     tmpdir.chdir()
 
+    if platform.system() == "Windows" and six.PY3:
+        # There are encoding problems on Windows with the encoding of →
+        tmpdir.join(".bumpversion.cfg").write("""[bumpversion]
+    message: Bump version: {current_version} to {new_version}
+    tag_message: 'Bump version: {current_version} to {new_version}""")
+
     try:
-        out = check_output('bumpversion --help', shell=True, stderr=subprocess.STDOUT).decode('utf-8')
+        out = check_output('bumpversion --help', shell=True, stderr=subprocess.STDOUT)
     except subprocess.CalledProcessError as e:
         out = e.output
 
-    if not 'usage: bumpversion [-h]' in out:
+    if not b'usage: bumpversion [-h]' in out:
         print(out)
 
-    assert 'usage: bumpversion [-h]' in out
+    assert b'usage: bumpversion [-h]' in out
+
 
 @pytest.mark.parametrize(("vcs"), [xfail_if_no_git("git"), xfail_if_no_hg("hg")])
 def test_regression_help_in_workdir(tmpdir, capsys, vcs):