1 files changed, 23 insertions, 0 deletions
diff --git a/shared/tests/test_resilience.py b/shared/tests/test_resilience.py
index dde47e1..5ed4ac3 100644
--- a/shared/tests/test_resilience.py
+++ b/shared/tests/test_resilience.py
@@ -136,6 +136,29 @@ async def test_half_open_after_cooldown():
     assert result == "recovered"
 
 
+async def test_half_open_reopens_on_failure():
+    cb = CircuitBreaker(failure_threshold=2, cooldown=0.05)
+
+    async def always_fail():
+        raise ConnectionError("fail")
+
+    # Trip the breaker
+    for _ in range(2):
+        with pytest.raises(ConnectionError):
+            await cb.call(always_fail)
+
+    # Wait for cooldown
+    await asyncio.sleep(0.1)
+
+    # Half-open probe should fail and re-open
+    with pytest.raises(ConnectionError):
+        await cb.call(always_fail)
+
+    # Should be open again (no cooldown wait)
+    with pytest.raises(RuntimeError, match="Circuit breaker is open"):
+        await cb.call(always_fail)
+
+
 # --- async_timeout tests ---