From cb8d108ac1d032733c737fa233874f38d3c2b800 Mon Sep 17 00:00:00 2001
From: Andrew Leech <andrew.leech@planetinnovation.com.au>
Date: Tue, 3 May 2022 16:10:12 +1000
Subject: [PATCH] unittest: Add test for environment isolation.

---
 python-stdlib/unittest/test_unittest.py          |  6 ++++++
 python-stdlib/unittest/test_unittest_isolated.py | 15 +++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 python-stdlib/unittest/test_unittest_isolated.py

diff --git a/python-stdlib/unittest/test_unittest.py b/python-stdlib/unittest/test_unittest.py
index 7d7e4ca2..690fb40d 100644
--- a/python-stdlib/unittest/test_unittest.py
+++ b/python-stdlib/unittest/test_unittest.py
@@ -1,4 +1,5 @@
 import unittest
+from test_unittest_isolated import global_context
 
 
 class TestUnittestAssertions(unittest.TestCase):
@@ -142,6 +143,11 @@ class TestUnittestAssertions(unittest.TestCase):
         else:
             self.fail("Unexpected success was not detected")
 
+    def test_NotChangedByOtherTest(self):
+        global global_context
+        assert global_context is None
+        global_context = True
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/python-stdlib/unittest/test_unittest_isolated.py b/python-stdlib/unittest/test_unittest_isolated.py
new file mode 100644
index 00000000..a828f9a3
--- /dev/null
+++ b/python-stdlib/unittest/test_unittest_isolated.py
@@ -0,0 +1,15 @@
+import unittest
+
+
+global_context = None
+
+
+class TestUnittestIsolated(unittest.TestCase):
+    def test_NotChangedByOtherTest(self):
+        global global_context
+        assert global_context is None
+        global_context = True
+
+
+if __name__ == "__main__":
+    unittest.main()