/*
 * Copyright 2012-2014 the original author or authors.
 *
 * 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 org.springframework.boot;

import java.io.File;
import java.io.FileReader;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.junit.rules.TemporaryFolder;
import org.springframework.util.FileCopyUtils;

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.isEmptyOrNullString;
import static org.hamcrest.Matchers.not;
import static org.junit.Assert.assertThat;

/**
 * Tests for {@link ApplicationPid}.
 * @author Phillip Webb
 */
public class ApplicationPidTests {

	@Rule
	public ExpectedException thrown = ExpectedException.none();

	@Rule
	public TemporaryFolder temporaryFolder = new TemporaryFolder();

	@Test
	public void toStringWithPid() throws Exception {
		assertThat(new ApplicationPid("123").toString(), equalTo("123"));
	}

	@Test
	public void toStringWithoutPid() throws Exception {
		assertThat(new ApplicationPid(null).toString(), equalTo("???"));
	}

	@Test
	public void throwIllegalStateWritingMissingPid() throws Exception {
		ApplicationPid pid = new ApplicationPid(null);
		this.thrown.expect(IllegalStateException.class);
		this.thrown.expectMessage("No PID available");
		pid.write(this.temporaryFolder.newFile());
	}

	@Test
	public void writePid() throws Exception {
		ApplicationPid pid = new ApplicationPid("123");
		File file = this.temporaryFolder.newFile();
		pid.write(file);
		String actual = FileCopyUtils.copyToString(new FileReader(file));
		assertThat(actual, equalTo("123"));
	}

	@Test
	public void getPidFromJvm() throws Exception {
		assertThat(new ApplicationPid().toString(), not(isEmptyOrNullString()));
	}

}
