From a0cd55fd6d2697f4823d1de24c9dda5858b27610 Mon Sep 17 00:00:00 2001
From: "Eric N. Vander Weele" <ericvw@gmail.com>
Date: Sun, 28 Jul 2019 10:39:27 -0400
Subject: [PATCH] utils: Assert desired contract for `normalize_paths()`

This is a separate commit so it can be dropped during a rebase or revert
independently.
---
 src/flake8/utils.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/flake8/utils.py b/src/flake8/utils.py
index 06a1db1..bb6ba2e 100644
--- a/src/flake8/utils.py
+++ b/src/flake8/utils.py
@@ -168,6 +168,7 @@ def normalize_paths(paths, parent=os.curdir):
     :rtype:
         [str]
     """
+    assert isinstance(paths, list), paths  # nosec (for bandit)
     return [
         normalize_path(p, parent) for p in parse_comma_separated_list(paths)
     ]