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-rw-r--r--tox/_pytestplugin.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/tox/_pytestplugin.py b/tox/_pytestplugin.py
index 70fa48a..01c9033 100644
--- a/tox/_pytestplugin.py
+++ b/tox/_pytestplugin.py
@@ -26,6 +26,7 @@ def pytest_funcarg__newconfig(request, tmpdir):
s = py.std.textwrap.dedent(source)
p = tmpdir.join("tox.ini")
p.write(s)
+ assert isinstance(args, list)
old = tmpdir.chdir()
try:
return parseconfig(args)