From 54631457f55166d9656455f87a69bb4ff136287a Mon Sep 17 00:00:00 2001
From: Ashley Whetter <ashley@awhetter.co.uk>
Date: Sat, 18 Sep 2021 17:58:41 -0700
Subject: [PATCH] Fix tests on Windows

---
 mypy/test/testcmdline.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mypy/test/testcmdline.py b/mypy/test/testcmdline.py
index 917ae82112bcd..357bd5bae3fa8 100644
--- a/mypy/test/testcmdline.py
+++ b/mypy/test/testcmdline.py
@@ -59,7 +59,7 @@ def test_python_cmdline(testcase: DataDrivenTestCase, step: int) -> None:
     extra_path = os.path.join(os.path.abspath(test_temp_dir), 'pypath')
     env['PYTHONPATH'] = PREFIX
     if os.path.isdir(extra_path):
-        env['PYTHONPATH'] += ':' + extra_path
+        env['PYTHONPATH'] += os.pathsep + extra_path
     process = subprocess.Popen(fixed + args,
                                stdout=subprocess.PIPE,
                                stderr=subprocess.PIPE,