test: add unit test for TypeUtils

dubbo-common/src/test/java/org/apache/dubbo/common/utils/TypeUtilsTest.java

@@ -0,0 +1,67 @@
+/*
+ * 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.lang.reflect.Type;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class TypeUtilsTest {
+
+    static class StringList extends java.util.ArrayList<String> {}
+
+    static interface StringIntegerMap extends Map<String, Integer> {}
+
+    @Test
+    void testIsParameterizedType() {
+        // String is not parameterized
+        assertFalse(TypeUtils.isParameterizedType(String.class));
+
+        // Get the generic superclass of our StringList (which is ArrayList<String>)
+        Type genericType = StringList.class.getGenericSuperclass();
+        assertTrue(TypeUtils.isParameterizedType(genericType));
+    }
+
+    @Test
+    void testGetRawClass() {
+        Type genericType = StringList.class.getGenericSuperclass(); // ArrayList<String>
+        assertEquals(java.util.ArrayList.class, TypeUtils.getRawClass(genericType));
+
+        // Test with a normal class
+        assertEquals(String.class, TypeUtils.getRawClass(String.class));
+
+        // Test with null
+        assertNull(TypeUtils.getRawClass(null));
+    }
+
+    @Test
+    void testFindActualTypeArguments() {
+        // Check StringList (should find String)
+        List<Class<?>> args = TypeUtils.findActualTypeArguments(StringList.class, List.class);
+        assertEquals(1, args.size());
+        assertEquals(String.class, args.get(0));
+    }
+
+    @Test
+    void testGetClassName() {
+        assertEquals(String.class.getName(), TypeUtils.getClassName(String.class));
+    }
+}