Specifying coverage config for tox

Author: bsipocz

tox.ini

@@ -48,7 +48,7 @@ commands =
     pip freeze
     # FIXME: there are too many failures in the docs example gallery, ignore it for now
     !cov: pytest --pyargs astroquery {toxinidir}/docs --ignore={toxinidir}/docs/gallery* {posargs}
-    cov:  pytest --pyargs astroquery {toxinidir}/docs --ignore={toxinidir}/docs/gallery* --cov astroquery {posargs}
+    cov:  pytest --pyargs astroquery {toxinidir}/docs --ignore={toxinidir}/docs/gallery* --cov astroquery --cov-config={toxinidir}/setup.cfg {posargs}
     cov: coverage xml -o {toxinidir}/coverage.xml
 
 [testenv:codestyle]