From eaa05531eddd70ef30ad0771c98bb47cfa6fc710 Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Tue, 1 Oct 2019 13:24:23 -0700
Subject: [PATCH] Add test to ensure _pytest is warning-clean on import

---
 testing/test_meta.py | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 testing/test_meta.py

diff --git a/testing/test_meta.py b/testing/test_meta.py
new file mode 100644
index 000000000..7aa100e6e
--- /dev/null
+++ b/testing/test_meta.py
@@ -0,0 +1,28 @@
+import pkgutil
+import subprocess
+import sys
+
+import _pytest
+import pytest
+
+
+def _modules():
+    return sorted(
+        n
+        for _, n, _ in pkgutil.walk_packages(
+            _pytest.__path__, prefix=_pytest.__name__ + "."
+        )
+    )
+
+
+@pytest.mark.parametrize("module", _modules())
+def test_no_warnings(module):
+    # fmt: off
+    subprocess.check_call((
+        sys.executable,
+        "-W", "error",
+        # https://github.com/pytest-dev/pytest/issues/5901
+        "-W", "ignore:The usage of `cmp` is deprecated and will be removed on or after 2021-06-01.  Please use `eq` and `order` instead.:DeprecationWarning",  # noqa: E501
+        "-c", "import {}".format(module),
+    ))
+    # fmt: on