pytester: do not use outer plugins

Sets PYTEST_DISABLE_PLUGIN_AUTOLOAD=1 by default. Fixes pytest-dev#4351.
blueyed · Dec 9, 2018 · 213e1d9 · 213e1d9
1 parent 818aa4d
commit 213e1d9
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
@@ -503,6 +503,7 @@ def __init__(self, request, tmpdir_factory):
         self.test_tmproot = tmpdir_factory.mktemp("tmp-" + name, numbered=True)
         os.environ["PYTEST_DEBUG_TEMPROOT"] = str(self.test_tmproot)
         os.environ.pop("TOX_ENV_DIR", None)  # Ensure that it is not used for caching.
+        os.environ.setdefault("PYTEST_DISABLE_PLUGIN_AUTOLOAD", "1")
         self.plugins = []
         self._cwd_snapshot = CwdSnapshot()
         self._sys_path_snapshot = SysPathsSnapshot()