test(ttl): improve TTL test coverage and accuracy

- Add mock patches to verify cache get and put calls
- Test cache hit scenarios for different TTL values
- Validate cache expiration and re-calculation
- Ensure proper testing of all cache levels

Author: tanbro

tests/test_ttl.py

@@ -1,6 +1,7 @@
 import time
 from random import randint
 from unittest import TestCase
+from unittest.mock import patch
 
 from ._catches import CACHES
 
@@ -39,22 +40,57 @@ def echo3(x):
             echo3(val3)
 
             # 验证缓存命中
-            self.assertEqual(echo1(val1), val1)
-            self.assertEqual(echo2(val2), val2)
-            self.assertEqual(echo3(val3), val3)
+            with patch.object(cache, "get", return_value=cache.serialize(val1)) as mock_get:
+                with patch.object(cache, "put") as mock_put:
+                    self.assertEqual(echo1(val1), val1)
+                    mock_get.assert_called_once()
+                    mock_put.assert_not_called()
+
+            with patch.object(cache, "get", return_value=cache.serialize(val2)) as mock_get:
+                with patch.object(cache, "put") as mock_put:
+                    self.assertEqual(echo2(val2), val2)
+                    mock_get.assert_called_once()
+                    mock_put.assert_not_called()
+
+            with patch.object(cache, "get", return_value=cache.serialize(val3)) as mock_get:
+                with patch.object(cache, "put") as mock_put:
+                    self.assertEqual(echo3(val3), val3)
+                    mock_get.assert_called_once()
+                    mock_put.assert_not_called()
 
             # 等待超过最小 TTL 时间
             time.sleep(min(ttl_values) + 1)
 
             # 验证已过期的缓存
-            self.assertNotEqual(echo1(val1), val1)
-            self.assertEqual(echo2(val2), val2)  # 这个应该还未过期
-            self.assertEqual(echo3(val3), val3)  # 这个应该还未过期
+            with patch.object(cache, "put") as mock_put:
+                self.assertEqual(echo1(val1), val1)  # 应该触发重新计算
+                mock_put.assert_called_once()  # 确认缓存已过期并重新写入
+
+            # 验证其他缓存是否未过期
+            with patch.object(cache, "get", return_value=cache.serialize(val2)) as mock_get:
+                with patch.object(cache, "put") as mock_put:
+                    self.assertEqual(echo2(val2), val2)  # 这个应该还未过期
+                    mock_get.assert_called_once()
+                    mock_put.assert_not_called()
+
+            with patch.object(cache, "get", return_value=cache.serialize(val3)) as mock_get:
+                with patch.object(cache, "put") as mock_put:
+                    self.assertEqual(echo3(val3), val3)  # 这个应该还未过期
+                    mock_get.assert_called_once()
+                    mock_put.assert_not_called()
 
             # 等待超过所有 TTL 时间
             time.sleep(max(ttl_values) + 1)
 
             # 验证所有缓存都已过期
-            self.assertNotEqual(echo1(val1), val1)
-            self.assertNotEqual(echo2(val2), val2)
-            self.assertNotEqual(echo3(val3), val3)
+            with patch.object(cache, "put") as mock_put:
+                self.assertEqual(echo1(val1), val1)  # 应该触发重新计算
+                mock_put.assert_called_once()  # 确认缓存已过期并重新写入
+
+            with patch.object(cache, "put") as mock_put:
+                self.assertEqual(echo2(val2), val2)  # 应该触发重新计算
+                mock_put.assert_called_once()
+
+            with patch.object(cache, "put") as mock_put:
+                self.assertEqual(echo3(val3), val3)  # 应该触发重新计算
+                mock_put.assert_called_once()