Add ReuseHttpServletRequest ut (#11826)

* remove unused exception

* Add ReuseHttpServletRequest ut

* fix ut description

* fix code style

* fix code style

* fix code style

core/src/test/java/com/alibaba/nacos/core/utils/ReuseHttpServletRequestTest.java

@@ -0,0 +1,115 @@
+/*
+ * 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.core.utils;
+
+import com.alibaba.nacos.common.http.param.MediaType;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.mock.web.MockHttpServletRequest;
+
+import javax.servlet.ServletInputStream;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.util.Map;
+
+import static org.junit.Assert.fail;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+/**
+ * {@link ReuseHttpServletRequest} unit tests.
+ * @author lynn.lqp
+ * @date 2023/12/28
+ */
+public class ReuseHttpServletRequestTest {
+    private MockHttpServletRequest target;
+
+    private ReuseHttpServletRequest reuseHttpServletRequest;
+
+    @BeforeEach
+    public void setUp() throws IOException {
+        target = new MockHttpServletRequest();
+        target.setContentType("application/json");
+        target.setParameter("name", "test");
+        target.setParameter("value", "123");
+        reuseHttpServletRequest = new ReuseHttpServletRequest(target);
+    }
+
+    @Test
+    public void testConstructor() throws IOException {
+        try {
+            new ReuseHttpServletRequest(null);
+            fail("IllegalArgumentException expected");
+        } catch (IllegalArgumentException e) {
+            assertEquals("Request cannot be null", e.getMessage());
+        }
+        ReuseHttpServletRequest request = new ReuseHttpServletRequest(target);
+        assertNotNull(request);
+    }
+
+    @Test
+    public void testGetBody() throws Exception {
+        Object body = reuseHttpServletRequest.getBody();
+        assertNotNull(body);
+        assertEquals("name=test&value=123&", body.toString());
+
+        target.setContentType(MediaType.MULTIPART_FORM_DATA);
+        body = reuseHttpServletRequest.getBody();
+        assertNotNull(body);
+    }
+
+    @Test
+    public void testGetReader() throws IOException {
+        BufferedReader reader = reuseHttpServletRequest.getReader();
+        assertNotNull(reader);
+    }
+
+    @Test
+    public void testGetParameterMap() {
+        Map<String, String[]> parameterMap = reuseHttpServletRequest.getParameterMap();
+        assertNotNull(parameterMap);
+        assertEquals(2, parameterMap.size());
+        assertEquals("test", parameterMap.get("name")[0]);
+        assertEquals("123", parameterMap.get("value")[0]);
+    }
+
+    @Test
+    public void testGetParameter() {
+        String name = reuseHttpServletRequest.getParameter("name");
+        assertNotNull(name);
+        assertEquals("test", name);
+    }
+
+    @Test
+    public void testGetParameterValues() {
+        String[] values = reuseHttpServletRequest.getParameterValues("value");
+        assertNotNull(values);
+        assertEquals(1, values.length);
+        assertEquals("123", values[0]);
+    }
+
+    @Test
+    public void testGetInputStream() throws IOException {
+        ServletInputStream inputStream = reuseHttpServletRequest.getInputStream();
+        assertNotNull(inputStream);
+        int read = inputStream.read();
+        while (read != -1) {
+            read = inputStream.read();
+        }
+    }
+}