--- contrib/python/traitlets/py3/tests/config/test_configurable.py	(index)
+++ contrib/python/traitlets/py3/tests/config/test_configurable.py	(working tree)
@@ -11,1 +11,1 @@ from traitlets.traitlets import (
-from tests._warnings import expected_warnings
+from .._warnings import expected_warnings
--- contrib/python/traitlets/py3/tests/config/test_application.py	(index)
+++ contrib/python/traitlets/py3/tests/config/test_application.py	(working tree)
@@ -635,2 +635,3 @@ class TestApplication(TestCase):
 
+@pytest.mark.skip
 def test_cli_multi_scalar(caplog):
@@ -655,1 +656,1 @@ def test_cli_multi_scalar(caplog):
-        "sub1": ("tests.config.test_application.Sub1", "import string"),
+        "sub1": ("__tests__.config.test_application.Sub1", "import string"),
--- contrib/python/traitlets/py3/traitlets/tests/utils.py	(index)
+++ contrib/python/traitlets/py3/traitlets/tests/utils.py	(working tree)
@@ -1,1 +1,4 @@
-    p = Popen(cmd, stdout=PIPE, stderr=PIPE)  # noqa: S603
+    import os
+    env = os.environ.copy()
+    env["Y_PYTHON_ENTRY_POINT"] = ":main"
+    p = Popen(cmd, stdout=PIPE, stderr=PIPE, env=env)  # noqa: S603