[enhance issue #1492 ]Improved nacos configuration parsing, based on PropertySourceLoader---check

spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-config/src/test/java/com/alibaba/cloud/nacos/NacosConfigurationNoSuffixTest.java

@@ -51,7 +51,7 @@ import static org.springframework.boot.test.context.SpringBootTest.WebEnvironmen
 
 @RunWith(PowerMockRunner.class)
 @PowerMockIgnore({ "javax.management.*", "javax.xml.parsers.*",
-		"com.sun.org.apache.xerces.internal.jaxp.*" })
+		"com.sun.org.apache.xerces.internal.jaxp.*", "org.w3c.dom.*" })
 @PowerMockRunnerDelegate(SpringRunner.class)
 @PrepareForTest({ NacosConfigService.class })
 @SpringBootTest(classes = NacosConfigurationNoSuffixTest.TestConfig.class, properties = {