2

tests/test_protocol_client.py

@@ -227,6 +227,32 @@ class LocalSimObservationTests(unittest.TestCase):
         # 误差在 ±1° 内均匀分布，返回值再保留两位小数。
         self.assertLessEqual(abs(outcome.svd_deg - true_bearing), 1.005)
 
+    def test_same_position_error_is_fixed(self):
+        """同一（源，位置）重复测量读数不变 [题面/官方演练实测]。"""
+        source = Source(channel=1, x=1000, y=300, r_eff_m=1500)
+        simulator = LocalSimulator([source], robot_id="T001")
+        client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+        client.enter()
+        first = client.measure((0, 0), 1)
+        second = client.measure((0, 0), 1)   # 新 request_id，同位置
+        self.assertEqual(first.result, "direction")
+        self.assertEqual(first.svd_deg, second.svd_deg,
+                         "同位置重复测量的示向度必须相同")
+
+    def test_error_field_deterministic_per_seed(self):
+        """同种子误差场逐点一致；不同种子得到不同误差场（逐点白噪声）。"""
+        source = Source(channel=1, x=1000, y=0, r_eff_m=1500)
+        readings = {}
+        for label, seed in (("a", 1), ("b", 1), ("c", 2)):
+            simulator = LocalSimulator([source], error_seed=seed, robot_id="T001")
+            client = SimulatorClient("T001", transport=LocalSimTransport(simulator))
+            client.enter()
+            readings[label] = [client.measure((float(x), 0.0), 1).svd_deg
+                               for x in (0, 100, 200, 300, 400)]
+        self.assertEqual(readings["a"], readings["b"])
+        self.assertNotEqual(readings["a"], readings["c"],
+                            "不同种子应在至少一个测点产生不同读数")
+
 
 class SessionLogTests(unittest.TestCase):
     def test_log_records_attempts_and_accepted(self):