Allow to run with single tox environment

Change-Id: Ic77729d86449daf401602baf3fb35563aa87e10a
Signed-off-by: Gulsum Atici <gulsum.atici@canonical.com>

devops-stages/stage-test.sh

@@ -14,6 +14,6 @@
 # limitations under the License.
 set -e
 echo "Launching tox"
-tox --parallel=auto
+tox
 
 

releasenotes/notes/single_tox_environment-30aaca72e8b59c4e.yaml

+#######################################################################################
+# Copyright ETSI Contributors and Others.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#######################################################################################
+---
+other:
+  - |
+    Running several tox environment parallely causes failures during stage tests frequently. 
+    Although the reason is not clear, we are suspicious that environments are affecting each other.
+    This change allows to run only one tox environment at the same time.
+    

tox.ini

@@ -20,6 +20,7 @@ envlist = black, flake8, safety, cover
 
 [tox:jenkins]
 toxworkdir = /tmp/.tox
+setenv = XDG_CACHE_HOME=/tmp/.cache
 
 [testenv]
 usedevelop = True