test: fix NacosPropertySourceRefreshListener test setup

The tests were adding plain MapPropertySource to propertySources, but the
production code checks for NacosPropertySource type. This caused the refresh
logic to never execute, resulting in test failures where values weren't updated.

Fixed by:
1. Adding NacosPropertySource wrapper to propertySources instead of inner MapPropertySource
2. Specifying "yml" suffix in NacosPropertySource constructor to match test data

Signed-off-by: sywu14 <wushiyuanwork@outlook.com>

Author: wushiyuanmaimob

spring-cloud-alibaba-starters/spring-alibaba-nacos-config/src/test/java/com.alibaba.cloud.nacos/refresh/NacosPropertySourceRefreshListenerTest.java

@@ -90,9 +90,9 @@ public void testRefreshWithConfigDataPathNaming() throws NacosException {
 		initialData.put("app.name", "old-value");
 		MapPropertySource innerSource = new MapPropertySource(configDataName, initialData);
 		NacosPropertySource nacosPropertySource = new NacosPropertySource(
-				Collections.singletonList(innerSource), group, dataId, new Date(), true);
+				Collections.singletonList(innerSource), group, dataId, new Date(), true, "yml");
 
-		propertySources.addLast(innerSource);
+		propertySources.addLast(nacosPropertySource);
 
 		// Mark app as ready
 		listener.handle(mock(ApplicationReadyEvent.class));
@@ -129,9 +129,9 @@ public void testRefreshWithYmlExtension() throws NacosException {
 		initialData.put("app.port", "8080");
 		MapPropertySource innerSource = new MapPropertySource(sourceName, initialData);
 		NacosPropertySource nacosPropertySource = new NacosPropertySource(
-				Collections.singletonList(innerSource), group, dataId, new Date(), true);
+				Collections.singletonList(innerSource), group, dataId, new Date(), true, "yml");
 
-		propertySources.addLast(innerSource);
+		propertySources.addLast(nacosPropertySource);
 
 		// Mark app as ready
 		listener.handle(mock(ApplicationReadyEvent.class));