/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.common.portability;

import static org.junit.Assert.assertEquals;
import static org.junit.Assume.assumeTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.io.File;

import com.redhat.thermostat.shared.config.OS;
import org.junit.Assume;
import org.junit.Test;

public class ProcessCheckerTest {

    // only Linux (and other /proc OS) can test process.exists(pid) like this

    private static final int SOME_PID = 80980;
    
    @Test
    public void testProcessExists() {
        assumeTrue(OS.IS_LINUX);
        basicTest(true);
    }
    
    @Test
    public void testProcessNotExisting() {
        assumeTrue(OS.IS_LINUX);
        basicTest(false);
    }
    
    private void basicTest(boolean expected) {
        final File baseFile = mock(File.class);
        when(baseFile.exists()).thenReturn(expected);
        ProcessChecker process = new ProcessChecker() {
            @Override
            File mapToFile(int pid) {
                assertEquals(SOME_PID, pid);
                return baseFile;
            }
        };
        assertEquals(expected, process.exists(SOME_PID));
    }
}