fix revert of duplicated flows

1 files changed, 11 insertions, 0 deletions

diff --git a/test/mitmproxy/test_flow.py b/test/mitmproxy/test_flow.py
index 7f9d577b..fcc766b5 100644
--- a/test/mitmproxy/test_flow.py
+++ b/test/mitmproxy/test_flow.py
@@ -84,6 +84,17 @@ class TestSerialize:
         with pytest.raises(Exception, match="version"):
             list(r.stream())
 
+    def test_copy(self):
+        """
+        _backup may be shared across instances. That should not raise errors.
+        """
+        f = tflow.tflow()
+        f.backup()
+        f.request.path = "/foo"
+        f2 = f.copy()
+        f2.revert()
+        f.revert()
+
 
 class TestFlowMaster:
     def test_load_flow_reverse(self):