Improve testing in py3 environment

Change-Id: I1d169f0a87d4251778b32e80b3627b407340fec8

oslo/concurrency/processutils.py

@@ -181,7 +181,7 @@ def execute(*cmd, **kwargs):
                           'specify a root helper.'))
         cmd = shlex.split(root_helper) + list(cmd)
 
-    cmd = map(str, cmd)
+    cmd = [str(c) for c in cmd]
     sanitized_cmd = strutils.mask_password(' '.join(cmd))
 
     while attempts > 0:

tests/unit/test_processutils.py

@@ -142,7 +142,7 @@ exit 1
             self.assertRaises(processutils.ProcessExecutionError,
                               processutils.execute,
                               tmpfilename, tmpfilename2, attempts=10,
-                              process_input='foo',
+                              process_input=b'foo',
                               delay_on_retry=False)
             fp = open(tmpfilename2, 'r')
             runs = fp.read()
@@ -199,7 +199,7 @@ grep foo
             os.chmod(tmpfilename, 0o755)
             processutils.execute(tmpfilename,
                                  tmpfilename2,
-                                 process_input='foo',
+                                 process_input=b'foo',
                                  attempts=2)
         finally:
             os.unlink(tmpfilename)
@@ -295,7 +295,7 @@ grep foo
 
         out, err = processutils.execute('/usr/bin/env', env_variables=env_vars)
 
-        self.assertIn('SUPER_UNIQUE_VAR=The answer is 42', out)
+        self.assertIn(b'SUPER_UNIQUE_VAR=The answer is 42', out)
 
     def test_exception_and_masking(self):
         tmpfilename = self.create_tempfiles(
@@ -314,8 +314,8 @@ grep foo
                                 'something')
 
         self.assertEqual(38, err.exit_code)
-        self.assertEqual(err.stdout, 'onstdout --password="***"\n')
-        self.assertEqual(err.stderr, 'onstderr --password="***"\n')
+        self.assertIn('onstdout --password="***"', err.stdout)
+        self.assertIn('onstderr --password="***"', err.stderr)
         self.assertEqual(err.cmd, ' '.join([tmpfilename,
                                             'password="***"',
                                             'something']))

tox.ini

@@ -23,13 +23,13 @@ commands =
 deps = -r{toxinidir}/requirements-py3.txt
        -r{toxinidir}/test-requirements.txt
 commands =
-    lockutils-wrapper python -m testtools.run tests.unit.test_lockutils
+    lockutils-wrapper python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:py34]
 deps = -r{toxinidir}/requirements-py3.txt
        -r{toxinidir}/test-requirements.txt
 commands =
-    lockutils-wrapper python -m testtools.run tests.unit.test_lockutils
+    lockutils-wrapper python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:pep8]
 commands = flake8