From b5a649110e6e199930e3dff3c11f3a225b5a38c4 Mon Sep 17 00:00:00 2001
From: root <root@njcn.local>
Date: Fri, 26 Jun 2026 05:06:05 +0800
Subject: [PATCH] =?UTF-8?q?test(cache):=20=E9=9B=86=E6=88=90=E6=B5=8B?=
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---
 .../integration/CachePenetrationTest.java     | 59 +++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 src/test/java/com/njcn/middle/cache/integration/CachePenetrationTest.java

diff --git a/src/test/java/com/njcn/middle/cache/integration/CachePenetrationTest.java b/src/test/java/com/njcn/middle/cache/integration/CachePenetrationTest.java
new file mode 100644
index 0000000..144457e
--- /dev/null
+++ b/src/test/java/com/njcn/middle/cache/integration/CachePenetrationTest.java
@@ -0,0 +1,59 @@
+package com.njcn.middle.cache.integration;
+
+import com.njcn.middle.cache.template.RedisCacheEnhanceTemplate;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.SpringBootConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.function.Supplier;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+/** 集成测试:回源返回 null 时缓存空值标记,二次查询命中空标记、loader 不再被调用。 */
+@ExtendWith(RedisAvailableCondition.class)
+@SpringBootTest(classes = CachePenetrationTest.TestApp.class,
+        properties = {"redis-cache.key-prefix=it-cache:", "redis-cache.null-ttl-seconds=30"})
+class CachePenetrationTest {
+
+    @Autowired
+    private RedisCacheEnhanceTemplate cache;
+
+    @Test
+    void nullResultCachedAndLoaderCalledOnce() {
+        String key = "pen:missing:1";
+        cache.delete(key);
+
+        AtomicInteger calls = new AtomicInteger();
+        Supplier<User> loader = () -> {
+            calls.incrementAndGet();
+            return null; // 数据不存在
+        };
+
+        assertNull(cache.getOrLoad(key, User.class, 60, loader));
+        assertNull(cache.getOrLoad(key, User.class, 60, loader)); // 命中空值标记
+        assertEquals(1, calls.get());
+
+        cache.delete(key);
+    }
+
+    @SpringBootConfiguration
+    @EnableAutoConfiguration
+    static class TestApp {
+    }
+
+    @Data
+    @AllArgsConstructor
+    @NoArgsConstructor
+    static class User {
+        private Long id;
+        private String name;
+    }
+}