Keep the existing PYTHONPATH in tox

Without this the tests could not be run on systems that already use PYTHONPATH (like NixOS).
pytest-dev · Oct 4, 2015 · d3e03b9 · d3e03b9
1 parent 6ca7dd4
commit d3e03b9
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diff --git a/generate_configurations.py b/generate_configurations.py
@@ -49,7 +49,7 @@ def is_pypy(self):
     deps =
     %(deps)s
     setenv =
-         PYTHONPATH = {toxinidir}
+         PYTHONPATH = {toxinidir}:{env:PYTHONPATH:}
          UID = %(uid)s
     """)