fix：补充了测试代码

tests/test_CN_GPT_detection.py

@@ -0,0 +1,35 @@
+import unittest
+import warnings
+import os
+from detection.cngptdetection import cndetectGPT
+
+class TestBackdoorDetection(unittest.TestCase):
+    def test_gpt_risk_detection(self):
+        content = """import os
+        os.system('rm -rf /')   # high risk
+        exec('print("Hello")')  # high risk
+        eval('2 + 2')   # high risk
+        """
+        results = cndetectGPT(content)
+        self.assertEqual(len(results["high"]), 3)
+
+    def test_gpt_no_risk_detection(self):
+        content = """a = 10
+        b = a + 5
+        print('This should not be detected as risky.')
+        """
+        results = cndetectGPT(content)
+        self.assertEqual(len(results["high"]), 0)
+        self.assertEqual(len(results["medium"]), 0)
+        self.assertEqual(len(results["low"]), 0)
+
+    def test_gpt_env_no_set(self):
+        if os.getenv("BAIDU_API_KEY") is None or os.getenv("BAIDU_SECRET_KEY") is None:
+            self.skipTest("BAIDU_API_KEY or BAIDU_SECRET_KEY is not set")
+        content = "print('test test')"
+        with self.assertRaises(ValueError):
+            cndetectGPT(content)
+
+
+if __name__ == "__main__":
+    unittest.main()