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A collection of JUnit rules for testing code which uses java.lang.System.
There is a newer version: 1.19.0
package org.junit.contrib.java.lang.system.internal;

import java.io.FileDescriptor;
import java.net.InetAddress;
import java.security.Permission;

/**
 * A {@code NoExitSecurityManager} throws a {@link CheckExitCalled} exception
 * whenever {@link #checkExit(int)} is called. All other method calls are
 * delegated to the original security manager.
 */
public class NoExitSecurityManager extends SecurityManager {
	private final SecurityManager originalSecurityManager;
	private Integer statusOfFirstExitCall = null;

	public NoExitSecurityManager(SecurityManager originalSecurityManager) {
		this.originalSecurityManager = originalSecurityManager;
	}

	@Override
	public void checkExit(int status) {
		if (statusOfFirstExitCall == null)
			statusOfFirstExitCall = status;
		throw new CheckExitCalled(status);
	}

	public boolean isCheckExitCalled() {
		return statusOfFirstExitCall != null;
	}

	public int getStatusOfFirstCheckExitCall() {
		if (isCheckExitCalled())
			return statusOfFirstExitCall;
		else
			throw new IllegalStateException(
				"checkExit(int) has not been called.");
	}

	@Override
	public boolean getInCheck() {
		return (originalSecurityManager != null)
			&& originalSecurityManager.getInCheck();
	}

	@Override
	public Object getSecurityContext() {
		return (originalSecurityManager == null) ? super.getSecurityContext()
			: originalSecurityManager.getSecurityContext();
	}

	@Override
	public void checkPermission(Permission perm) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkPermission(perm);
	}

	@Override
	public void checkPermission(Permission perm, Object context) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkPermission(perm, context);
	}

	@Override
	public void checkCreateClassLoader() {
		if (originalSecurityManager != null)
			originalSecurityManager.checkCreateClassLoader();
	}

	@Override
	public void checkAccess(Thread t) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkAccess(t);
	}

	@Override
	public void checkAccess(ThreadGroup g) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkAccess(g);
	}

	@Override
	public void checkExec(String cmd) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkExec(cmd);
	}

	@Override
	public void checkLink(String lib) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkLink(lib);
	}

	@Override
	public void checkRead(FileDescriptor fd) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkRead(fd);
	}

	@Override
	public void checkRead(String file) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkRead(file);
	}

	@Override
	public void checkRead(String file, Object context) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkRead(file, context);
	}

	@Override
	public void checkWrite(FileDescriptor fd) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkWrite(fd);
	}

	@Override
	public void checkWrite(String file) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkWrite(file);
	}

	@Override
	public void checkDelete(String file) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkDelete(file);
	}

	@Override
	public void checkConnect(String host, int port) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkConnect(host, port);
	}

	@Override
	public void checkConnect(String host, int port, Object context) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkConnect(host, port, context);
	}

	@Override
	public void checkListen(int port) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkListen(port);
	}

	@Override
	public void checkAccept(String host, int port) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkAccept(host, port);
	}

	@Override
	public void checkMulticast(InetAddress maddr) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkMulticast(maddr);
	}

	@Override
	public void checkMulticast(InetAddress maddr, byte ttl) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkMulticast(maddr, ttl);
	}

	@Override
	public void checkPropertiesAccess() {
		if (originalSecurityManager != null)
			originalSecurityManager.checkPropertiesAccess();
	}

	@Override
	public void checkPropertyAccess(String key) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkPropertyAccess(key);
	}

	@Override
	public boolean checkTopLevelWindow(Object window) {
		return (originalSecurityManager == null) ? super.checkTopLevelWindow(window)
			: originalSecurityManager.checkTopLevelWindow(window);
	}

	@Override
	public void checkPrintJobAccess() {
		if (originalSecurityManager != null)
			originalSecurityManager.checkPrintJobAccess();
	}

	@Override
	public void checkSystemClipboardAccess() {
		if (originalSecurityManager != null)
			originalSecurityManager.checkSystemClipboardAccess();
	}

	@Override
	public void checkAwtEventQueueAccess() {
		if (originalSecurityManager != null)
			originalSecurityManager.checkAwtEventQueueAccess();
	}

	@Override
	public void checkPackageAccess(String pkg) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkPackageAccess(pkg);
	}

	@Override
	public void checkPackageDefinition(String pkg) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkPackageDefinition(pkg);
	}

	@Override
	public void checkSetFactory() {
		if (originalSecurityManager != null)
			originalSecurityManager.checkSetFactory();
	}

	@Override
	public void checkMemberAccess(Class clazz, int which) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkMemberAccess(clazz, which);
	}

	@Override
	public void checkSecurityAccess(String target) {
		if (originalSecurityManager != null)
			originalSecurityManager.checkSecurityAccess(target);
	}

	@Override
	public ThreadGroup getThreadGroup() {
		return (originalSecurityManager == null) ? super.getThreadGroup()
			: originalSecurityManager.getThreadGroup();
	}
}