[ISSUE #5095] Add unit test for ClassUtils (#6327)

* fix typo

* add unit test for ClassUtils

common/src/main/java/com/alibaba/nacos/common/utils/ClassUtils.java

@@ -106,7 +106,7 @@ public final class ClassUtils {
      * @param cls Instances of the class represent classes and interfaces.
      * @return the simple name of the underlying class.
      */
-    public static String getSimplaName(Class cls) {
+    public static String getSimpleName(Class cls) {
         Objects.requireNonNull(cls, "cls");
         return cls.getSimpleName();
     }
@@ -117,7 +117,7 @@ public final class ClassUtils {
      * @param obj Object instance.
      * @return the simple name of the underlying class.
      */
-    public static String getSimplaName(Object obj) {
+    public static String getSimpleName(Object obj) {
         Objects.requireNonNull(obj, "obj");
         return obj.getClass().getSimpleName();
     }

common/src/test/java/com/alibaba/nacos/common/utils/ClassUtilsTest.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 1999-2018 Alibaba Group Holding Ltd.
+ *
+ * Licensed 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 com.alibaba.nacos.common.utils;
+
+import com.alibaba.nacos.api.exception.runtime.NacosRuntimeException;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class ClassUtilsTest {
+    @Test
+    public void testFindClassByName1() {
+        Class<?> clazz = ClassUtils.findClassByName("java.lang.Integer");
+        Assert.assertEquals("java.lang.Integer", clazz.getName());
+    }
+    
+    @Test(expected = NacosRuntimeException.class)
+    public void testFindClassByName2() {
+        ClassUtils.findClassByName("not.exist.Class");
+    }
+    
+    @Test
+    public void testGetName() {
+        final String name = "java.lang.Integer";
+        Integer val = 1;
+        Assert.assertEquals(name, ClassUtils.getName(val));
+        Assert.assertEquals(name, ClassUtils.getName(Integer.class));
+        
+        Assert.assertEquals(name, ClassUtils.getCanonicalName(val));
+        Assert.assertEquals(name, ClassUtils.getCanonicalName(Integer.class));
+        
+        Assert.assertEquals("Integer", ClassUtils.getSimpleName(val));
+        Assert.assertEquals("Integer", ClassUtils.getSimpleName(Integer.class));
+    }
+    
+    @Test
+    public void testIsAssignableFrom() {
+        Assert.assertTrue(ClassUtils.isAssignableFrom(Object.class, Integer.class));
+    }
+}

naming/src/main/java/com/alibaba/nacos/naming/core/v2/service/impl/PersistentClientOperationServiceImpl.java

@@ -240,9 +240,9 @@ public class PersistentClientOperationServiceImpl extends RequestProcessor4CP im
     
     private class PersistentInstanceSnapshotOperation extends AbstractSnapshotOperation {
         
-        private final String snapshotSaveTag = ClassUtils.getSimplaName(getClass()) + ".SAVE";
+        private final String snapshotSaveTag = ClassUtils.getSimpleName(getClass()) + ".SAVE";
         
-        private final String snapshotLoadTag = ClassUtils.getSimplaName(getClass()) + ".LOAD";
+        private final String snapshotLoadTag = ClassUtils.getSimpleName(getClass()) + ".LOAD";
         
         private static final String SNAPSHOT_ARCHIVE = "persistent_instance.zip";