fix: drop Jackson 2 dependency from polaris config endpoint test

The module has no Jackson on the test classpath and the project has moved to
Jackson 3, so importing com.fasterxml.jackson.databind broke testCompile.
Assert on the endpoint map directly instead of serializing it.

Co-authored-by: Cursor <cursoragent@cursor.com>

spring-cloud-starter-tencent-polaris-config/src/test/java/com/tencent/cloud/polaris/config/endpoint/PolarisConfigEndpointTest.java

@@ -21,7 +21,6 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import com.tencent.cloud.polaris.config.PolarisConfigSDKContextManager;
 import com.tencent.cloud.polaris.config.adapter.MockedConfigKVFile;
 import com.tencent.cloud.polaris.config.adapter.PolarisPropertySource;
@@ -67,7 +66,7 @@ public class PolarisConfigEndpointTest {
 
 	@Test
 	@SuppressWarnings("unchecked")
-	public void testPolarisConfigEndpoint() throws Exception {
+	public void testPolarisConfigEndpoint() {
 		PolarisConfigProperties properties = new PolarisConfigProperties();
 		properties.setToken("endpoint-must-not-expose-this-token");
 		Map<String, Object> content = new HashMap<>();
@@ -81,19 +80,23 @@ public class PolarisConfigEndpointTest {
 
 		PolarisConfigEndpoint endpoint = new PolarisConfigEndpoint(properties);
 		Map<String, Object> info = endpoint.polarisConfig();
+		assertThat(info.get("ClientId")).isNull();
 		assertThat(info.get("PolarisConfigProperties")).isInstanceOf(Map.class);
+		Map<String, Object> configProperties = (Map<String, Object>) info.get("PolarisConfigProperties");
+		assertThat(configProperties).doesNotContainKey("token");
 		List<Map<String, Object>> sources = (List<Map<String, Object>>) info.get("PolarisPropertySource");
 		assertThat(sources).hasSize(1);
 		assertThat(sources.get(0)).containsEntry("namespace", testNamespace)
 				.containsEntry("group", testServiceName)
-				.containsEntry("fileName", testFileName);
-
-		// Actuator serializes the return value. Keep it to plain DTO structures and never expose
-		// property values through this diagnostic endpoint.
-		String json = new ObjectMapper().writeValueAsString(info);
-		assertThat(json).contains("\"ClientId\":null", "\"propertyNames\":[")
-				.doesNotContain("sensitive-value-one", "sensitive-value-two", "sensitive-value-three",
-						"endpoint-must-not-expose-this-token");
+				.containsEntry("fileName", testFileName)
+				.containsKey("propertyNames")
+				.doesNotContainKeys("k1", "k2", "k3");
+		assertThat((List<String>) sources.get(0).get("propertyNames")).containsExactlyInAnyOrder("k1", "k2", "k3");
+
+		// Endpoint returns plain maps for actuator serialization and must not leak credentials
+		// or property values into the diagnostic payload.
+		assertThat(String.valueOf(info)).doesNotContain("sensitive-value-one", "sensitive-value-two",
+				"sensitive-value-three", "endpoint-must-not-expose-this-token");
 	}
 
 	@Test