Add debug to tox enviroment

We can simply run `tox -e debug <test_name>` to debug test.

Change-Id: Ib5fe98014dc91fa81809f336264856cd0f86e950

test-requirements.txt

@@ -11,6 +11,7 @@ tempest>=12.1.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=1.4.0 # MIT
+oslotest>=1.10.0 # Apache-2.0
 
 # doc build requirements
 oslosphinx>=4.7.0 # Apache-2.0

tox.ini

@@ -6,6 +6,7 @@ skipsdist = True
 [testenv]
 usedevelop = True
 whitelist_externals = bash
+                      find
 install_command =
     {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
 setenv = VIRTUAL_ENV={envdir}
@@ -36,6 +37,11 @@ commands = python setup.py testr --slowest --testr-args="--concurrency 1 {posarg
 [testenv:cover]
 commands = {toxinidir}/tools/cover.sh {posargs}
 
+[testenv:debug]
+commands =
+  find . -type f -name "*.pyc" -delete
+  oslo_debug_helper -t muranoclient/tests {posargs}
+
 [testenv:pyflakes]
 deps = flake8
 commands = flake8