/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */
package org.onap.aai.util;

import static org.junit.Assert.*;

import java.io.File;

import org.junit.Test;
import org.mockito.Mockito;

public class FileWatcherTest {
	
	class FileWatcherExtension extends FileWatcher {

		public FileWatcherExtension(File file) {
			super(file);
		}

		@Override
		protected void onChange(File file) {
			System.out.println("do nothing");
		}
	}

	@Test
	public void testFileWatcher() {
		File file = new File("helloworld");
		file.setLastModified(new Long(123));
		FileWatcher fileWatcher = new FileWatcherExtension(file);
		assertNotNull(fileWatcher);
		file.deleteOnExit();
	}
	
	@Test(expected=NullPointerException.class)
	public void testFileWatcher_nullConstructor() {
		FileWatcher fileWatcher = new FileWatcherExtension(null);
		assertNull(fileWatcher);
	}
	
	@Test
	public void testRun() {
		// verify that code is reachable outside of conditional check in run()
		File file = new File("helloworld");
		file.setLastModified(new Long(100));
		FileWatcher fileWatcher = new FileWatcherExtension(file);
		fileWatcher.run();
		file.deleteOnExit();
	}

	@Test
	public void testOnChange() throws Exception {
		FileWatcher fileWatcher = Mockito.mock(FileWatcher.class, Mockito.CALLS_REAL_METHODS);
		
		fileWatcher.onChange(Mockito.any(File.class));
		
		Mockito.verify(fileWatcher).onChange(Mockito.any(File.class));
	}
}