Don't quote {posargs} in tox.ini
Quotes around {posargs} cause the entire string to be combined into one
arg that gets passed to stestr. This prevents passing multiple args
(e.g. '--concurrency=16 some-regex')
MODIFY
tox.ini
tox.ini
@@ -48,7 +48,7 @@ basepython = python3
setenv =
PYTHON=coverage run --source heatclient --parallel-mode
commands =
- stestr run '{posargs}'
+ stestr run {posargs}
coverage combine
coverage html -d cover
coverage xml -o cover/coverage.xml

Don't quote {posargs} in tox.ini

Quotes around {posargs} cause the entire string to be combined into one
arg that gets passed to stestr. This prevents passing multiple args
(e.g. '--concurrency=16 some-regex')

Change-Id: I6ee01703bd4c432211f0d6e2f3501c989523ae11