test: add offline bridge and client coverage

codex_telegram_bridge/tests/test_exec_runner.py

@@ -0,0 +1,31 @@
+import asyncio
+
+from codex_telegram_bridge.exec_bridge import CodexExecRunner
+
+
+def test_run_serialized_serializes_same_session() -> None:
+    runner = CodexExecRunner(codex_cmd="codex", workspace=None, extra_args=[])
+    gate = asyncio.Event()
+    in_flight = 0
+    max_in_flight = 0
+
+    async def run_stub(*_args, **_kwargs):
+        nonlocal in_flight, max_in_flight
+        in_flight += 1
+        max_in_flight = max(max_in_flight, in_flight)
+        await gate.wait()
+        in_flight -= 1
+        return ("sid", "ok", True)
+
+    runner.run = run_stub  # type: ignore[assignment]
+
+    async def run_test() -> None:
+        t1 = asyncio.create_task(runner.run_serialized("a", "sid"))
+        t2 = asyncio.create_task(runner.run_serialized("b", "sid"))
+        await asyncio.sleep(0)
+        gate.set()
+        await asyncio.gather(t1, t2)
+
+    asyncio.run(run_test())
+
+    assert max_in_flight == 1