google3/third_party/java_src/junit/test/java/org/junit/tests/running/core/SystemExitTest.java

package org.junit.tests.running.core;

import static org.junit.Assert.assertEquals;

import java.io.File;
import java.io.InputStream;

import org.junit.Test;

// Make sure System.exit works as expected. We've had problems with this on some platforms.
public class SystemExitTest {

    private static final int EXIT_CODE = 5;

    static public class Exit {
        public static void main(String[] args) {
            System.exit(EXIT_CODE);
        }
    }

    @Test
    public void failureCausesExitCodeOf1() throws Exception {
        String java = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java";
        String classPath = getClass().getClassLoader().getResource(".").getFile() + File.pathSeparator + System.getProperty("java.class.path");
        String[] cmd = {java, "-cp", classPath, getClass().getName() + "$Exit"};
        Process process = Runtime.getRuntime().exec(cmd);
        InputStream input = process.getInputStream();
        while ((input.read()) != -1) ;
        assertEquals(EXIT_CODE, process.waitFor());
    }
}