Add ExcelUtilsTest.java , the unit test for ExcelUtils (#1500)

dolphinscheduler-alert/src/main/java/org/apache/dolphinscheduler/alert/utils/ExcelUtils.java

@@ -41,12 +41,9 @@ public class ExcelUtils {
      */
     public static void genExcelFile(String content,String title,String xlsFilePath){
         List<LinkedHashMap> itemsList;
-        try {
-            itemsList = JSONUtils.toList(content, LinkedHashMap.class);
-        }catch (Exception e){
-            logger.error(String.format("json format incorrect : %s",content),e);
-            throw new RuntimeException("json format incorrect",e);
-        }
+
+        //The JSONUtils.toList has been try catch ex
+        itemsList = JSONUtils.toList(content, LinkedHashMap.class);
 
         if (itemsList == null || itemsList.size() == 0){
             logger.error("itemsList is null");

dolphinscheduler-alert/src/test/java/org/apache/dolphinscheduler/alert/utils/ExcelUtilsTest.java

@@ -0,0 +1,92 @@
+/*
+ * 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.dolphinscheduler.alert.utils;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.junit.rules.TemporaryFolder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import java.io.File;
+import static org.junit.Assert.assertTrue;
+
+public class ExcelUtilsTest {
+
+    private static final Logger logger = LoggerFactory.getLogger(ExcelUtilsTest.class);
+
+    @Rule
+    public ExpectedException expectedException = ExpectedException.none();
+
+    @Rule
+    public TemporaryFolder folder = new TemporaryFolder();
+
+    private String rootPath = null;
+
+    @Before
+    public void setUp() throws Exception {
+
+        folder.create();
+        rootPath = folder.getRoot().getAbsolutePath();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+
+        folder.delete();
+    }
+
+    /**
+     * Test GenExcelFile
+     */
+    @Test
+    public void testGenExcelFile() {
+
+        //Define dest file path
+        String xlsFilePath = rootPath + System.getProperty("file.separator");
+        logger.info("xlsFilePath: "+xlsFilePath);
+
+        //Define correctContent
+        String correctContent = "[{\"name\":\"ds name\",\"value\":\"ds value\"}]";
+
+        //Define incorrectContent
+        String incorrectContent1 = "{\"name\":\"ds name\",\"value\":\"ds value\"}";
+
+        //Define title
+        String title = "test report";
+
+        //Invoke genExcelFile with correctContent
+        ExcelUtils.genExcelFile(correctContent, title, xlsFilePath);
+
+        //Test file exists
+        File xlsFile = new File(xlsFilePath + Constants.SINGLE_SLASH + title + Constants.EXCEL_SUFFIX_XLS);
+        assertTrue(xlsFile.exists());
+
+        //Expected RuntimeException
+        expectedException.expect(RuntimeException.class);
+
+        //Expected error message
+        expectedException.expectMessage("itemsList is null");
+
+        //Invoke genExcelFile with incorrectContent, will cause RuntimeException
+        ExcelUtils.genExcelFile(incorrectContent1, title, xlsFilePath);
+
+    }
+}

pom.xml

@@ -616,6 +616,7 @@
 						<include>**/common/graph/*.java</include>
 						<include>**/api/utils/CheckUtilsTest.java</include>
 						<include>**/api/utils/FileUtilsTest.java</include>
+            <include>**/alert/utils/ExcelUtilsTest.java</include>
 					</includes>
 					<!-- <skip>true</skip> -->
 				</configuration>