Set utf-8 in decode and encode calls

It eases backporting in iruya and hunter as a few logs can't be
decoded as ascii [1].

[1] https://build.opnfv.org/ci/job/functest-opnfv-functest-vnf-iruya-juju_epc-run/56/console

Change-Id: I52a6f9a25130cbf62e8ce3b9972064ab73177665
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
(cherry picked from commit 5853dd1ef3c522a975f9685250b1b3e85588f738)

10 files changed, 57 insertions, 56 deletions

diff --git a/functest/opnfv_tests/openstack/rally/rally.py b/functest/opnfv_tests/openstack/rally/rally.py
index 08e4a36c1..6dfdabec8 100644
--- a/functest/opnfv_tests/openstack/rally/rally.py
+++ b/functest/opnfv_tests/openstack/rally/rally.py
@@ -166,7 +166,7 @@ class RallyBase(singlevm.VmReady2):
                                 stdout=subprocess.PIPE,
                                 stderr=subprocess.STDOUT)
         deployment_uuid = proc.stdout.readline().rstrip()
-        return deployment_uuid.decode()
+        return deployment_uuid.decode("utf-8")
 
     @staticmethod
     def create_rally_deployment(environ=None):
@@ -191,18 +191,18 @@ class RallyBase(singlevm.VmReady2):
                    '--deployment',
                    str(getattr(config.CONF, 'rally_deployment_name'))]
             output = subprocess.check_output(cmd)
-            LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+            LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         except subprocess.CalledProcessError:
             pass
 
         cmd = ['rally', 'deployment', 'create', '--fromenv',
                '--name', str(getattr(config.CONF, 'rally_deployment_name'))]
         output = subprocess.check_output(cmd, env=environ)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
         cmd = ['rally', 'deployment', 'check']
         output = subprocess.check_output(cmd)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         return RallyBase.get_verifier_deployment_id()
 
     @staticmethod
@@ -240,7 +240,7 @@ class RallyBase(singlevm.VmReady2):
         taskid_re = re.compile('^Task +(.*): started$')
         for line in cmd_raw.splitlines(True):
             line = line.strip()
-            match = taskid_re.match(line.decode())
+            match = taskid_re.match(line.decode("utf-8"))
             if match:
                 return match.group(1)
         return None
@@ -399,7 +399,7 @@ class RallyBase(singlevm.VmReady2):
         cmd = (["rally", "task", "detailed", "--uuid", task_id])
         LOGGER.debug('running command: %s', cmd)
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
         # save report as JSON
         report_json_name = '{}.json'.format(test_name)
@@ -408,7 +408,7 @@ class RallyBase(singlevm.VmReady2):
                 "--out", report_json_dir])
         LOGGER.debug('running command: %s', cmd)
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
         json_results = open(report_json_dir).read()
         self._append_summary(json_results, test_name)
@@ -608,7 +608,7 @@ class RallyBase(singlevm.VmReady2):
                "--to", file_name]
         LOGGER.debug('running command: %s', cmd)
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
     @staticmethod
     def verify_report(file_name, uuid, export_type="html"):
@@ -624,7 +624,7 @@ class RallyBase(singlevm.VmReady2):
                "--uuid", uuid, "--to", file_name]
         LOGGER.debug('running command: %s', cmd)
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
     def clean(self):
         """Cleanup of OpenStack resources. Should be called on completion."""
diff --git a/functest/opnfv_tests/openstack/refstack/refstack.py b/functest/opnfv_tests/openstack/refstack/refstack.py
index 49fa65826..645cc565b 100644
--- a/functest/opnfv_tests/openstack/refstack/refstack.py
+++ b/functest/opnfv_tests/openstack/refstack/refstack.py
@@ -52,7 +52,7 @@ class Refstack(tempest.TempestCommon):
         yaml_data2 = ""
         for line in output.splitlines():
             try:
-                grp = re.search(r'^([^\[]*)(\[.*\])\n*$', line.decode())
+                grp = re.search(r'^([^\[]*)(\[.*\])\n*$', line.decode("utf-8"))
                 yaml_data2 = "{}\n{}: {}".format(
                     yaml_data2, grp.group(1), grp.group(2))
             except Exception:  # pylint: disable=broad-except
diff --git a/functest/opnfv_tests/openstack/shaker/shaker.py b/functest/opnfv_tests/openstack/shaker/shaker.py
index 51ac88ae0..1ee669ce3 100644
--- a/functest/opnfv_tests/openstack/shaker/shaker.py
+++ b/functest/opnfv_tests/openstack/shaker/shaker.py
@@ -113,8 +113,8 @@ class Shaker(singlevm.SingleVm2):
                 self.shaker_timeout, self.image.name, self.flavor.name,
                 self.fip.floating_ip_address, self.ext_net.id,
                 env.get('NAMESERVER')))
-        self.__logger.info("output:\n%s", stdout.read().decode())
-        self.__logger.info("error:\n%s", stderr.read().decode())
+        self.__logger.info("output:\n%s", stdout.read().decode("utf-8"))
+        self.__logger.info("error:\n%s", stderr.read().decode("utf-8"))
         if not os.path.exists(self.res_dir):
             os.makedirs(self.res_dir)
         try:
diff --git a/functest/opnfv_tests/openstack/tempest/tempest.py b/functest/opnfv_tests/openstack/tempest/tempest.py
index 69f7c2958..831f732d1 100644
--- a/functest/opnfv_tests/openstack/tempest/tempest.py
+++ b/functest/opnfv_tests/openstack/tempest/tempest.py
@@ -142,8 +142,8 @@ class TempestCommon(singlevm.VmReady2):
                                 stdout=subprocess.PIPE,
                                 stderr=subprocess.STDOUT)
         for line in proc.stdout:
-            LOGGER.info(line.decode().rstrip())
-            new_line = line.decode().replace(' ', '').split('|')
+            LOGGER.info(line.decode("utf-8").rstrip())
+            new_line = line.decode("utf-8").replace(' ', '').split('|')
             if 'Tests' in new_line:
                 break
             if 'Testscount' in new_line:
@@ -175,7 +175,7 @@ class TempestCommon(singlevm.VmReady2):
                '--force']
         try:
             output = subprocess.check_output(cmd)
-            LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+            LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         except subprocess.CalledProcessError:
             pass
 
@@ -184,7 +184,7 @@ class TempestCommon(singlevm.VmReady2):
                '--name', str(getattr(config.CONF, 'tempest_verifier_name')),
                '--type', 'tempest', '--system-wide']
         output = subprocess.check_output(cmd)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         return TempestCommon.get_verifier_id()
 
     @staticmethod
@@ -199,7 +199,7 @@ class TempestCommon(singlevm.VmReady2):
                                 stdout=subprocess.PIPE,
                                 stderr=subprocess.STDOUT)
         verifier_uuid = proc.stdout.readline().rstrip()
-        return verifier_uuid.decode()
+        return verifier_uuid.decode("utf-8")
 
     @staticmethod
     def get_verifier_repo_dir(verifier_id):
@@ -320,7 +320,7 @@ class TempestCommon(singlevm.VmReady2):
         cmd = ['rally', 'verify', 'configure-verifier', '--reconfigure',
                '--id', str(getattr(config.CONF, 'tempest_verifier_name'))]
         output = subprocess.check_output(cmd)
-        LOGGER.info("%s\n%s", " ".join(cmd), output.decode())
+        LOGGER.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
         LOGGER.debug("Looking for tempest.conf file...")
         tempest_conf_file = os.path.join(deployment_dir, "tempest.conf")
@@ -347,7 +347,7 @@ class TempestCommon(singlevm.VmReady2):
             cmd = "(cd {0}; stestr list '{1}' >{2} 2>/dev/null)".format(
                 self.verifier_repo_dir, testr_mode, self.list)
             output = subprocess.check_output(cmd, shell=True)
-            LOGGER.info("%s\n%s", cmd, output.decode())
+            LOGGER.info("%s\n%s", cmd, output.decode("utf-8"))
         os.remove('/etc/tempest.conf')
 
     def apply_tempest_blacklist(self):
@@ -403,12 +403,12 @@ class TempestCommon(singlevm.VmReady2):
 
         with proc.stdout:
             for line in iter(proc.stdout.readline, b''):
-                if re.search(r"\} tempest\.", line.decode()):
+                if re.search(r"\} tempest\.", line.decode("utf-8")):
                     LOGGER.info(line.rstrip())
-                elif re.search(r'(?=\(UUID=(.*)\))', line.decode()):
+                elif re.search(r'(?=\(UUID=(.*)\))', line.decode("utf-8")):
                     self.verification_id = re.search(
-                        r'(?=\(UUID=(.*)\))', line.decode()).group(1)
-                f_stdout.write(line.decode())
+                        r'(?=\(UUID=(.*)\))', line.decode("utf-8")).group(1)
+                f_stdout.write(line.decode("utf-8"))
         proc.wait()
         f_stdout.close()
 
diff --git a/functest/opnfv_tests/openstack/vmtp/vmtp.py b/functest/opnfv_tests/openstack/vmtp/vmtp.py
index 4397e2b47..57bc6c3ea 100644
--- a/functest/opnfv_tests/openstack/vmtp/vmtp.py
+++ b/functest/opnfv_tests/openstack/vmtp/vmtp.py
@@ -104,7 +104,7 @@ class Vmtp(singlevm.VmReady2):
         if not os.path.exists(self.res_dir):
             os.makedirs(self.res_dir)
         cmd = ['vmtp', '-sc']
-        output = subprocess.check_output(cmd).decode()
+        output = subprocess.check_output(cmd).decode("utf-8")
         self.__logger.info("%s\n%s", " ".join(cmd), output)
         with open(self.config, "w+") as conf:
             vmtp_conf = yaml.load(output)
@@ -146,12 +146,12 @@ class Vmtp(singlevm.VmReady2):
         cmd = ['vmtp', '-d', '--json', '{}/vmtp.json'.format(self.res_dir),
                '-c', self.config]
         output = subprocess.check_output(
-            cmd, stderr=subprocess.STDOUT, env=new_env).decode()
+            cmd, stderr=subprocess.STDOUT, env=new_env).decode("utf-8")
         self.__logger.info("%s\n%s", " ".join(cmd), output)
         cmd = ['vmtp_genchart', '-c', '{}/vmtp.html'.format(self.res_dir),
                '{}/vmtp.json'.format(self.res_dir)]
         output = subprocess.check_output(
-            cmd, stderr=subprocess.STDOUT).decode()
+            cmd, stderr=subprocess.STDOUT).decode("utf-8")
         self.__logger.info("%s\n%s", " ".join(cmd), output)
         with open('{}/vmtp.json'.format(self.res_dir), 'r') as res_file:
             self.details = json.load(res_file)
diff --git a/functest/opnfv_tests/vnf/epc/juju_epc.py b/functest/opnfv_tests/vnf/epc/juju_epc.py
index 5b2e0e3de..058b32c9d 100644
--- a/functest/opnfv_tests/vnf/epc/juju_epc.py
+++ b/functest/opnfv_tests/vnf/epc/juju_epc.py
@@ -171,7 +171,7 @@ class JujuEpc(singlevm.VmReady2):
             yfile.write(CLOUD_TEMPLATE.format(**cloud_data))
         cmd = ['juju', 'add-cloud', 'abot-epc', '-f', clouds_yaml, '--replace']
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
     def _register_credentials(self):
         self.__logger.info("Creating Credentials for Abot-epc .....")
@@ -189,7 +189,7 @@ class JujuEpc(singlevm.VmReady2):
         cmd = ['juju', 'add-credential', 'abot-epc', '-f', credentials_yaml,
                '--replace']
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
     def prepare(self):
         """Prepare testcase (Additional pre-configuration steps)."""
@@ -214,7 +214,7 @@ class JujuEpc(singlevm.VmReady2):
                    'RegionOne'),
                '-u', self.public_auth_url]
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         return image
 
     def publish_image_alt(self, name=None):
@@ -225,7 +225,7 @@ class JujuEpc(singlevm.VmReady2):
                    'RegionOne'),
                '-u', self.public_auth_url]
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         return image_alt
 
     def deploy_orchestrator(self):  # pylint: disable=too-many-locals
@@ -255,11 +255,11 @@ class JujuEpc(singlevm.VmReady2):
                    '--config', 'use-default-secgroup=true',
                    '--debug']
             output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-            self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+            self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         except subprocess.CalledProcessError as cpe:
             self.__logger.error(
                 "Exception with Juju Bootstrap: %s\n%s",
-                cpe.cmd, cpe.output.decode())
+                cpe.cmd, cpe.output.decode("utf-8"))
             return False
         except Exception:  # pylint: disable=broad-except
             self.__logger.exception("Some issue with Juju Bootstrap ...")
@@ -272,9 +272,9 @@ class JujuEpc(singlevm.VmReady2):
         cmd = ['juju', 'status', '--format', 'short', name]
         for i in range(10):
             output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-            self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+            self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
             ret = re.search(
-                r'(?=workload:({})\))'.format(status), output.decode())
+                r'(?=workload:({})\))'.format(status), output.decode("utf-8"))
             if ret:
                 self.__logger.info("%s workload is %s", name, status)
                 break
@@ -293,17 +293,17 @@ class JujuEpc(singlevm.VmReady2):
         self.__logger.info("Deploying Abot-epc bundle file ...")
         cmd = ['juju', 'deploy', '{}'.format(descriptor.get('file_name'))]
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         self.__logger.info("Waiting for instances .....")
         try:
             cmd = ['timeout', '-t', JujuEpc.juju_timeout, 'juju-wait']
             output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-            self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+            self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
             self.__logger.info("Deployed Abot-epc on Openstack")
         except subprocess.CalledProcessError as cpe:
             self.__logger.error(
                 "Exception with Juju VNF Deployment: %s\n%s",
-                cpe.cmd, cpe.output.decode())
+                cpe.cmd, cpe.output.decode("utf-8"))
             return False
         except Exception:  # pylint: disable=broad-except
             self.__logger.exception("Some issue with the VNF Deployment ..")
@@ -312,7 +312,7 @@ class JujuEpc(singlevm.VmReady2):
         self.__logger.info("Checking status of ABot and EPC units ...")
         cmd = ['juju', 'status']
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.debug("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.debug("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         for app in ['abot-epc-basic', 'oai-epc', 'oai-hss']:
             if not self.check_app(app):
                 return False
@@ -322,7 +322,7 @@ class JujuEpc(singlevm.VmReady2):
                'juju', 'scp', '--', '-r', '-v',
                '{}/featureFiles'.format(self.case_dir), 'abot-epc-basic/0:~/']
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
         self.__logger.info("Copying the feature files within Abot_node ")
         cmd = ['timeout', '-t', JujuEpc.juju_timeout,
@@ -330,7 +330,7 @@ class JujuEpc(singlevm.VmReady2):
                'sudo', 'cp', '-vfR', '~/featureFiles/*',
                '/etc/rebaca-test-suite/featureFiles']
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         return True
 
     def test_vnf(self):
@@ -340,11 +340,11 @@ class JujuEpc(singlevm.VmReady2):
         cmd = ['juju', 'run-action', 'abot-epc-basic/0', 'run',
                'tagnames={}'.format(self.details['test_vnf']['tag_name'])]
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
         cmd = ['timeout', '-t', JujuEpc.juju_timeout, 'juju-wait']
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
 
         duration = time.time() - start_time
         self.__logger.info("Getting results from Abot node....")
@@ -354,7 +354,7 @@ class JujuEpc(singlevm.VmReady2):
                '/var/lib/abot-epc-basic/artifacts/TestResults.json',
                '{}/.'.format(self.res_dir)]
         output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-        self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+        self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         self.__logger.info("Parsing the Test results...")
         res = (process_abot_test_result('{}/TestResults.json'.format(
             self.res_dir)))
@@ -393,17 +393,18 @@ class JujuEpc(singlevm.VmReady2):
         try:
             cmd = ['juju', 'debug-log', '--replay', '--no-tail']
             output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-            self.__logger.debug("%s\n%s", " ".join(cmd), output.decode())
+            self.__logger.debug(
+                "%s\n%s", " ".join(cmd), output.decode("utf-8"))
             self.__logger.info("Destroying Orchestrator...")
             cmd = ['timeout', '-t', JujuEpc.juju_timeout,
                    'juju', 'destroy-controller', '-y', 'abot-controller',
                    '--destroy-all-models']
             output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
-            self.__logger.info("%s\n%s", " ".join(cmd), output.decode())
+            self.__logger.info("%s\n%s", " ".join(cmd), output.decode("utf-8"))
         except subprocess.CalledProcessError as cpe:
             self.__logger.error(
                 "Exception with Juju Cleanup: %s\n%s",
-                cpe.cmd, cpe.output.decode())
+                cpe.cmd, cpe.output.decode("utf-8"))
         except Exception:  # pylint: disable=broad-except
             self.__logger.exception("General issue during the undeployment ..")
         for fip in self.cloud.list_floating_ips():
diff --git a/functest/opnfv_tests/vnf/router/vnf_controller/ssh_client.py b/functest/opnfv_tests/vnf/router/vnf_controller/ssh_client.py
index 67f1e0d6d..6f4a9cf7f 100644
--- a/functest/opnfv_tests/vnf/router/vnf_controller/ssh_client.py
+++ b/functest/opnfv_tests/vnf/router/vnf_controller/ssh_client.py
@@ -110,7 +110,7 @@ class SshClient(object):  # pylint: disable=too-many-instance-attributes
                                       cmd)
                     break
 
-                res_buff += res.decode()
+                res_buff += res.decode("utf-8")
 
             self.logger.debug("Response : '%s'", res_buff)
             return res_buff
diff --git a/functest/tests/unit/openstack/rally/test_rally.py b/functest/tests/unit/openstack/rally/test_rally.py
index c51258060..83332c86f 100644
--- a/functest/tests/unit/openstack/rally/test_rally.py
+++ b/functest/tests/unit/openstack/rally/test_rally.py
@@ -78,13 +78,13 @@ class OSRallyTesting(unittest.TestCase):
         calls = [
             mock.call(['rally', 'deployment', 'destroy', '--deployment',
                        str(getattr(config.CONF, 'rally_deployment_name'))]),
-            mock.call().decode(),
+            mock.call().decode("utf-8"),
             mock.call(['rally', 'deployment', 'create', '--fromenv', '--name',
                        str(getattr(config.CONF, 'rally_deployment_name'))],
                       env=None),
-            mock.call().decode(),
+            mock.call().decode("utf-8"),
             mock.call(['rally', 'deployment', 'check']),
-            mock.call().decode()]
+            mock.call().decode("utf-8")]
         mock_exec.assert_has_calls(calls)
 
     @mock.patch('functest.opnfv_tests.openstack.rally.rally.os.path.exists')
diff --git a/functest/tests/unit/utils/test_functest_utils.py b/functest/tests/unit/utils/test_functest_utils.py
index ba022e377..4ec205894 100644
--- a/functest/tests/unit/utils/test_functest_utils.py
+++ b/functest/tests/unit/utils/test_functest_utils.py
@@ -99,7 +99,7 @@ class FunctestUtilsTesting(unittest.TestCase):
                 mock.patch('six.moves.builtins.open',
                            mock.mock_open()) as mopen:
             stream = six.BytesIO()
-            stream.write(self.cmd_readline().encode())
+            stream.write(self.cmd_readline().encode("utf-8"))
             mock_obj2 = mock.Mock()
             attrs = {'stdout': stream, 'wait.return_value': 1}
             mock_obj2.configure_mock(**attrs)
@@ -120,7 +120,7 @@ class FunctestUtilsTesting(unittest.TestCase):
                 mock.patch('six.moves.builtins.open',
                            mock.mock_open()) as mopen:
             stream = six.BytesIO()
-            stream.write(self.cmd_readline().encode())
+            stream.write(self.cmd_readline().encode("utf-8"))
             mock_obj2 = mock.Mock()
             attrs = {'stdout': stream, 'wait.return_value': 0}
             mock_obj2.configure_mock(**attrs)
@@ -139,7 +139,7 @@ class FunctestUtilsTesting(unittest.TestCase):
         with mock.patch('functest.utils.functest_utils.subprocess.Popen') \
                 as mock_subproc_open:
             stream = six.BytesIO()
-            stream.write(self.cmd_readline().encode())
+            stream.write(self.cmd_readline().encode("utf-8"))
             mock_obj2 = mock.Mock()
             attrs = {'stdout': stream, 'wait.return_value': 0}
             mock_obj2.configure_mock(**attrs)
@@ -155,7 +155,7 @@ class FunctestUtilsTesting(unittest.TestCase):
         with mock.patch('functest.utils.functest_utils.subprocess.Popen') \
                 as mock_subproc_open:
             stream = six.BytesIO()
-            stream.write(self.cmd_readline().encode())
+            stream.write(self.cmd_readline().encode("utf-8"))
             mock_obj2 = mock.Mock()
             attrs = {'stdout': stream, 'wait.return_value': 1}
             mock_obj2.configure_mock(**attrs)
diff --git a/functest/utils/functest_utils.py b/functest/utils/functest_utils.py
index 4bc417d61..42c1edc9b 100644
--- a/functest/utils/functest_utils.py
+++ b/functest/utils/functest_utils.py
@@ -43,9 +43,9 @@ def execute_command(cmd, info=False, error_msg="",
         ofd = open(output_file, "w")
     for line in iter(popen.stdout.readline, b''):
         if output_file:
-            ofd.write(line.decode())
+            ofd.write(line.decode("utf-8"))
         else:
-            line = line.decode().replace('\n', '')
+            line = line.decode("utf-8").replace('\n', '')
             print(line)
             sys.stdout.flush()
     if output_file: