Stabilize the test ConfigManagerTest.testGetConfigByIdOrName() (#15758)

Author: Anshul-creator

dubbo-common/src/test/java/org/apache/dubbo/config/context/ConfigManagerTest.java

@@ -410,11 +410,20 @@ void testGetConfigByIdOrName() {
             Assertions.fail();
         } catch (Exception e) {
             Assertions.assertTrue(e instanceof IllegalStateException);
-            Assertions.assertEquals(
-                    e.getMessage(),
-                    "Found more than one config by name: dubbo, instances: "
-                            + "[<dubbo:protocol port=\"9103\" name=\"dubbo\" />, <dubbo:protocol name=\"dubbo\" />]. "
-                            + "Please remove redundant configs or get config by id.");
+            String msg = e.getMessage();
+
+            Assertions.assertTrue(
+                    msg.startsWith("Found more than one config by name: dubbo, instances: "),
+                    "Unexpected message prefix: " + msg);
+            Assertions.assertTrue(
+                    msg.contains("<dubbo:protocol port=\"9103\" name=\"dubbo\" />"),
+                    "Message should mention protocol with port 9103: " + msg);
+            Assertions.assertTrue(
+                    msg.contains("<dubbo:protocol name=\"dubbo\" />"),
+                    "Message should mention protocol with default port: " + msg);
+            Assertions.assertTrue(
+                    msg.endsWith("Please remove redundant configs or get config by id."),
+                    "Unexpected message suffix: " + msg);
         }
 
         ModuleConfig moduleConfig = new ModuleConfig();