diff --git a/tests/dev-basic-disco-stein b/tests/gate-basic-disco-stein
similarity index 100%
rename from tests/dev-basic-disco-stein
rename to tests/gate-basic-disco-stein
diff --git a/tox.ini b/tox.ini
index 2bc4114..b6d37fb 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,6 +4,10 @@
 [tox]
 envlist = pep8,py37
 skipsdist = True
+# NOTE(beisner): Avoid build/test env pollution by not enabling sitepackages.
+sitepackages = False
+# NOTE(beisner): Avoid false positives by not skipping missing interpreters.
+skip_missing_interpreters = False
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}