From 4ea58badbb0da9a48fabc8b1c1cf3ed0d5d7a808 Mon Sep 17 00:00:00 2001
From: LI123456mo <conellimo@gmail.com>
Date: Sat, 24 Jan 2026 20:30:32 +0300
Subject: [PATCH] test: add unit test for ReflectionUtils

---
 .../common/utils/ReflectionUtilsTest.java     | 74 +++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 dubbo-common/src/test/java/org/apache/dubbo/common/utils/ReflectionUtilsTest.java

diff --git a/dubbo-common/src/test/java/org/apache/dubbo/common/utils/ReflectionUtilsTest.java b/dubbo-common/src/test/java/org/apache/dubbo/common/utils/ReflectionUtilsTest.java
new file mode 100644
index 00000000000..3a32bc0fe26
--- /dev/null
+++ b/dubbo-common/src/test/java/org/apache/dubbo/common/utils/ReflectionUtilsTest.java
@@ -0,0 +1,74 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.dubbo.common.utils;
+
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ReflectionUtilsTest {
+
+    static class TestService implements Comparable<String> {
+        private String secret = "hidden_treasure";
+
+        private String sayHello(String name) {
+            return "Hello, " + name;
+        }
+
+        @Override
+        public int compareTo(String o) {
+            return 0;
+        }
+    }
+
+    @Test
+    void testGetField() {
+        TestService service = new TestService();
+        // Even though 'secret' is private, ReflectionUtils should find it
+        Object value = ReflectionUtils.getField(service, "secret");
+        assertEquals("hidden_treasure", value);
+    }
+
+    @Test
+    void testInvoke() {
+        TestService service = new TestService();
+        // Running a private method 'sayHello' with one parameter
+        Object result = ReflectionUtils.invoke(service, "sayHello", "Dubbo");
+        assertEquals("Hello, Dubbo", result);
+    }
+
+    @Test
+    void testGetClassGenerics() {
+        //  checks if the utility can see that TestService uses <String>
+        List<Class<?>> generics = ReflectionUtils.getClassGenerics(TestService.class, Comparable.class);
+
+        assertNotNull(generics);
+        assertFalse(generics.isEmpty());
+        assertEquals(String.class, generics.get(0));
+    }
+
+    @Test
+    void testGetFieldThrowsException() {
+        TestService service = new TestService();
+        // Testing that it fails correctly when the field name is wrong
+        assertThrows(ReflectionUtils.ReflectionException.class, () -> {
+            ReflectionUtils.getField(service, "nonExistentField");
+        });
+    }
+}