ENH: Don't stop at first failing test, run them all.

tox.ini

@@ -7,4 +7,5 @@ deps=pytest
     nose
     pytest-cov
 commands_pre=pip install ../caosdb-pylib/
-commands=pytest --cov=caosdb -vvx {posargs}
+# Add "-x" to stop at first error.
+commands=pytest --cov=caosdb -vv {posargs}