Add FileUtilsTest.java , the unit test for FileUtils (#1493) (#1)

/*

 * 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,

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 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package org.apache.dolphinscheduler.api.utils;

import org.junit.After;

import org.junit.Before;

import org.junit.Rule;

import org.junit.Test;

import org.junit.rules.TemporaryFolder;

import org.mockito.Mockito;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.core.io.Resource;

import org.springframework.web.multipart.MultipartFile;

import java.io.ByteArrayInputStream;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import static org.junit.Assert.*;

public class FileUtilsTest {

    private static final Logger logger = LoggerFactory.getLogger(FileUtilsTest.class);

    @Rule

    public TemporaryFolder folder = null;

    private String rootPath = null;

    @Before

    public void setUp() throws Exception {

        folder = new TemporaryFolder();

        folder.create();

        rootPath = folder.getRoot().getAbsolutePath();

    }

    @After

    public void tearDown() throws Exception {

        folder.delete();

    }

    /**

     * Use mock to test copyFile

     * @throws IOException

     */

    @Test

    public void testCopyFile() throws IOException {

        //Define dest file path

        String destFilename = rootPath + System.getProperty("file.separator") + "data.txt";

        logger.info("destFilename: "+destFilename);

        //Define InputStream for MultipartFile

        String data = "data text";

        InputStream targetStream = new ByteArrayInputStream(data.getBytes());

        //Use Mockito to mock MultipartFile

        MultipartFile file = Mockito.mock(MultipartFile.class);

        Mockito.when(file.getInputStream()).thenReturn(targetStream);

        //Invoke copyFile

        FileUtils.copyFile(file,destFilename);

        //Test file exists

        File destFile = new File(destFilename);

        assertTrue(destFile.exists());

    }

    @Test

    public void testFile2Resource() throws IOException {

        //Define dest file path

        String destFilename = rootPath + System.getProperty("file.separator") + "data.txt";

        logger.info("destFilename: "+destFilename);

        //Define test resource

        File file = folder.newFile("resource.txt");

        //Invoke file2Resource and test not null

        Resource resource = FileUtils.file2Resource(file.getAbsolutePath());

        assertNotNull(resource);

        //Invoke file2Resource and test null

        Resource resource1 = FileUtils.file2Resource(file.getAbsolutePath()+"abc");

        assertNull(resource1);

    }

}

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				<configuration>

					<includes>

						<include>**/api/utils/CheckUtilsTest.java</include>

						<include>**/api/utils/FileUtilsTest.java</include>

						<include>**/common/graph/*.java</include>

						<include>**/*CollectionUtilsTest.java</include><!--run test classes-->

					</includes>