Package com.sun.jna.platform.win32

Source Code of com.sun.jna.platform.win32.Advapi32UtilTest

/* Copyright (c) 2010 Daniel Doubrovkine, All Rights Reserved
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details. 
*/
package com.sun.jna.platform.win32;

import java.io.File;
import java.util.Map;
import java.util.TreeMap;

import junit.framework.TestCase;

import com.sun.jna.WString;
import com.sun.jna.platform.win32.Advapi32Util.Account;
import com.sun.jna.platform.win32.Advapi32Util.EventLogIterator;
import com.sun.jna.platform.win32.Advapi32Util.EventLogRecord;
import com.sun.jna.platform.win32.LMAccess.USER_INFO_1;
import com.sun.jna.platform.win32.WinNT.HANDLEByReference;
import com.sun.jna.platform.win32.WinNT.PSID;
import com.sun.jna.platform.win32.WinNT.SID_NAME_USE;
import com.sun.jna.platform.win32.WinNT.WELL_KNOWN_SID_TYPE;
import com.sun.jna.platform.win32.WinReg.HKEY;
import com.sun.jna.platform.win32.WinReg.HKEYByReference;

/**
* @author dblock[at]dblock[dot]org
*/
public class Advapi32UtilTest extends TestCase {

    public static void main(String[] args) {
        junit.textui.TestRunner.run(Advapi32UtilTest.class);
        String currentUserName = Advapi32Util.getUserName();
        System.out.println("GetUserName: " + currentUserName);
   
        for(Account group : Advapi32Util.getCurrentUserGroups()) {
            System.out.println(" " + group.fqn + " [" + group.sidString + "]");
        }
   
        Account accountByName = Advapi32Util.getAccountByName(currentUserName);
        System.out.println("AccountByName: " + currentUserName);
        System.out.println(" Fqn: " + accountByName.fqn);
        System.out.println(" Domain: " + accountByName.domain);
        System.out.println(" Sid: " + accountByName.sidString);
       
        Account accountBySid = Advapi32Util.getAccountBySid(new PSID(accountByName.sid));
        System.out.println("AccountBySid: " + accountByName.sidString);
        System.out.println(" Fqn: " + accountBySid.fqn);
        System.out.println(" Name: " + accountBySid.name);
        System.out.println(" Domain: " + accountBySid.domain);
    }

    public void testReadAccess() {
        final boolean access = Advapi32Util.accessCheck(new File(System.getProperty("java.io.tmpdir")), Advapi32Util.AccessCheckPermission.READ);
        assertTrue(access);
    }

    public void testWriteAccess() {
        final boolean access = Advapi32Util.accessCheck(new File(System.getProperty("java.io.tmpdir")), Advapi32Util.AccessCheckPermission.WRITE);
        assertTrue(access);
    }


    public void testExecuteAccess() {
        final boolean access = Advapi32Util.accessCheck(new File(System.getProperty("java.io.tmpdir")), Advapi32Util.AccessCheckPermission.EXECUTE);
        assertTrue(access);
    }
   
    public void testGetUsername() {
        String username = Advapi32Util.getUserName();
        assertTrue(username.length() > 0);
    }
 
    public void testGetAccountBySid() {   
        String accountName = Advapi32Util.getUserName();
        Account currentUser = Advapi32Util.getAccountByName(accountName);
        Account account = Advapi32Util.getAccountBySid(new PSID(currentUser.sid));
        assertEquals(SID_NAME_USE.SidTypeUser, account.accountType);
        assertEquals(currentUser.fqn.toLowerCase(), account.fqn.toLowerCase());
        assertEquals(currentUser.name.toLowerCase(), account.name.toLowerCase());
        assertEquals(currentUser.domain.toLowerCase(), account.domain.toLowerCase());
        assertEquals(currentUser.sidString, account.sidString);   
    }

    public void testGetAccountByName() {   
        String accountName = Advapi32Util.getUserName();
        Account account = Advapi32Util.getAccountByName(accountName);
        assertEquals(SID_NAME_USE.SidTypeUser, account.accountType);
    }
 
    public void testGetAccountNameFromSid() {
        assertEquals("Everyone", Advapi32Util.getAccountBySid("S-1-1-0").name);   
    }

    public void testGetAccountSidFromName() {
        assertEquals("S-1-1-0", Advapi32Util.getAccountByName("Everyone").sidString);
    }
 
    public void testConvertSid() {
      String sidString = "S-1-1-0"; // Everyone
      byte[] sidBytes = Advapi32Util.convertStringSidToSid(sidString);
      assertTrue(sidBytes.length > 0);
      String convertedSidString = Advapi32Util.convertSidToStringSid(new PSID(sidBytes));
      assertEquals(convertedSidString, sidString);
    }
 
    public void testGetCurrentUserGroups() {
        Account[] groups = Advapi32Util.getCurrentUserGroups();
        assertTrue(groups.length > 0);
        for(Account group : groups) {
            assertTrue(group.name.length() > 0);
            assertTrue(group.sidString.length() > 0);
            assertTrue(group.sid.length > 0);
        }
    }
 
    public void testGetUserGroups() {
      USER_INFO_1 userInfo = new USER_INFO_1();
      userInfo.usri1_name = new WString("JNANetapi32TestUser");
      userInfo.usri1_password = new WString("!JNAP$$Wrd0");
      userInfo.usri1_priv = LMAccess.USER_PRIV_USER;
        // ignore test if not able to add user (need to be administrator to do this).
        if (LMErr.NERR_Success != Netapi32.INSTANCE.NetUserAdd(null, 1, userInfo, null)) {
            return;
        }
        try {
            HANDLEByReference phUser = new HANDLEByReference();
            try {
                assertTrue(Advapi32.INSTANCE.LogonUser(userInfo.usri1_name.toString(),
                                                       null, userInfo.usri1_password.toString(), WinBase.LOGON32_LOGON_NETWORK,
                                                       WinBase.LOGON32_PROVIDER_DEFAULT, phUser));
                Account[] groups = Advapi32Util.getTokenGroups(phUser.getValue());
                assertTrue(groups.length > 0);
                for(Account group : groups) {
                    assertTrue(group.name.length() > 0);
                    assertTrue(group.sidString.length() > 0);
                    assertTrue(group.sid.length > 0);
                }
            } finally {
                if (phUser.getValue() != WinBase.INVALID_HANDLE_VALUE) {
                    Kernel32.INSTANCE.CloseHandle(phUser.getValue());
                }       
            }
        } finally {
            assertEquals("Error in NetUserDel",
                         LMErr.NERR_Success,
                         Netapi32.INSTANCE.NetUserDel(null, userInfo.usri1_name.toString()));     
        }
    }
 
    public void testGetUserAccount() {
      USER_INFO_1 userInfo = new USER_INFO_1();
      userInfo.usri1_name = new WString("JNANetapi32TestUser");
      userInfo.usri1_password = new WString("!JNAP$$Wrd0");
      userInfo.usri1_priv = LMAccess.USER_PRIV_USER;
        // ignore test if not able to add user (need to be administrator to do this).
        if (LMErr.NERR_Success != Netapi32.INSTANCE.NetUserAdd(null, 1, userInfo, null)) {
            return;
        }
        try {
            HANDLEByReference phUser = new HANDLEByReference();
            try {
                assertTrue(Advapi32.INSTANCE.LogonUser(userInfo.usri1_name.toString(),
                                                       null, userInfo.usri1_password.toString(), WinBase.LOGON32_LOGON_NETWORK,
                                                       WinBase.LOGON32_PROVIDER_DEFAULT, phUser));
                Advapi32Util.Account account = Advapi32Util.getTokenAccount(phUser.getValue());
                assertTrue(account.name.length() > 0);
                assertEquals(userInfo.usri1_name.toString(), account.name);
            } finally {
                if (phUser.getValue() != WinBase.INVALID_HANDLE_VALUE) {
                    Kernel32.INSTANCE.CloseHandle(phUser.getValue());
                }
            }
        } finally {
            assertEquals(LMErr.NERR_Success, Netapi32.INSTANCE.NetUserDel(
                                                                          null, userInfo.usri1_name.toString()));     
        }
    } 
 
    public void testRegistryKeyExists() {
        assertTrue(Advapi32Util.registryKeyExists(WinReg.HKEY_LOCAL_MACHINE,
                                                  ""));
        assertTrue(Advapi32Util.registryKeyExists(WinReg.HKEY_LOCAL_MACHINE,
                                                  "Software\\Microsoft"));
        assertFalse(Advapi32Util.registryKeyExists(WinReg.HKEY_LOCAL_MACHINE,
                                                   "KeyDoesNotExist\\SubKeyDoesNotExist"));
    }
 
    public void testRegistryValueExists() {
        assertFalse(Advapi32Util.registryValueExists(WinReg.HKEY_LOCAL_MACHINE,
                                                     "Software\\Microsoft", ""));
        assertFalse(Advapi32Util.registryValueExists(WinReg.HKEY_LOCAL_MACHINE,
                                                     "Software\\Microsoft", "KeyDoesNotExist"));
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_LOCAL_MACHINE,
                                                    "SYSTEM\\CurrentControlSet\\Control", "SystemBootDevice"));
   
 
    public void testRegistryCreateDeleteKey() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        assertTrue(Advapi32Util.registryKeyExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        assertFalse(Advapi32Util.registryKeyExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA"));
    }
 
    public void testRegistryCreateKeyDisposition() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        assertTrue(Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA"));
        assertFalse(Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA"));
        assertTrue(Advapi32Util.registryKeyExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
    }

    public void testRegistryDeleteValue() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registrySetIntValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "IntValue", 42);
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "IntValue"));
        Advapi32Util.registryDeleteValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "IntValue");   
        assertFalse(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "IntValue"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
    }
 
    public void testRegistrySetGetIntValue() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registrySetIntValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "IntValue", 42);
        assertEquals(42, Advapi32Util.registryGetIntValue(WinReg.HKEY_CURRENT_USER,
                                                          "Software\\JNA", "IntValue"));
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "IntValue"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
    }
 
    public void testRegistrySetGetLongValue() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registrySetLongValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "LongValue", 1234L);
        assertEquals(1234L, Advapi32Util.registryGetLongValue(WinReg.HKEY_CURRENT_USER,
                                                              "Software\\JNA", "LongValue"));
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "LongValue"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
    }
 
    public void testRegistrySetGetStringValue() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "StringValue", "Hello World");
        assertEquals("Hello World", Advapi32Util.registryGetStringValue(WinReg.HKEY_CURRENT_USER,
                                                                        "Software\\JNA", "StringValue"));
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "StringValue"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");   
    }

    public void testRegistrySetGetExpandableStringValue() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registrySetExpandableStringValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "StringValue", "Temp is %TEMP%");
        assertEquals("Temp is %TEMP%", Advapi32Util.registryGetExpandableStringValue(WinReg.HKEY_CURRENT_USER,
                                                                                     "Software\\JNA", "StringValue"));
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "StringValue"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");   
    }
 
    public void testRegistrySetGetStringArray() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        String[] dataWritten = { "Hello", "World" };
        Advapi32Util.registrySetStringArray(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "MultiStringValue", dataWritten);
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "MultiStringValue"));
        String[] dataRead = Advapi32Util.registryGetStringArray(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "MultiStringValue");
        assertEquals(dataWritten.length, dataRead.length);
        for(int i = 0; i < dataRead.length; i++) {
            assertEquals(dataWritten[i], dataRead[i]);
        }
        dataWritten = new String[0];
        Advapi32Util.registrySetStringArray(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "EmptyMultiString", dataWritten);
        dataRead = Advapi32Util.registryGetStringArray(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "EmptyMultiString");
        assertEquals(0, dataRead.length);
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
    }

    public void testRegistrySetGetBinaryValue() {
        byte[] data = { 0x00, 0x01, 0x02 };
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registrySetBinaryValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "BinaryValue", data);
        byte[] read = Advapi32Util.registryGetBinaryValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "BinaryValue");
        assertEquals(data.length, read.length);   
        for(int i = 0; i < data.length; i++) {
            assertEquals(data[i], read[i]);
        }
        assertTrue(Advapi32Util.registryValueExists(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "BinaryValue"));
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
    }
 
    public void testRegistryGetKeys() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key1");
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key2");
        String[] subKeys = Advapi32Util.registryGetKeys(WinReg.HKEY_CURRENT_USER, "Software\\JNA");
        assertEquals(2, subKeys.length);
        assertEquals(subKeys[0], "Key1");
        assertEquals(subKeys[1], "Key2");
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key1");
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key2");
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");       
    }
 
    public void testRegistryGetCloseKey() {
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key1");
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key2");
        HKEYByReference phkKey = Advapi32Util.registryGetKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", WinNT.KEY_READ);
        String[] subKeys = Advapi32Util.registryGetKeys(phkKey.getValue());
        assertEquals(2, subKeys.length);
        assertEquals(subKeys[0], "Key1");
        assertEquals(subKeys[1], "Key2");
        Advapi32Util.registryCloseKey(phkKey.getValue());
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key1");
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "Key2");
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
    }
 
    public void testRegistryGetValues() {
        String uu = new String("A" + "\\u00ea" + "\\u00f1" + "\\u00fc" + "C");
        Advapi32Util.registryCreateKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");
        Advapi32Util.registrySetIntValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "FourtyTwo" + uu, 42);
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "42" + uu, "FourtyTwo" + uu);
        Advapi32Util.registrySetExpandableStringValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "ExpandableString", "%TEMP%");
        byte[] dataWritten = { 0xD, 0xE, 0xA, 0xD, 0xB, 0xE, 0xE, 0xF };   
        Advapi32Util.registrySetBinaryValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "DeadBeef", dataWritten);
        String[] stringsWritten = { "Hello", "World", "Hello World", uu };
        Advapi32Util.registrySetStringArray(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "StringArray", stringsWritten);
        String[] emptyArray = new String[0];
        Advapi32Util.registrySetStringArray(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "EmptyStringArray", emptyArray);
        Advapi32Util.registrySetBinaryValue(WinReg.HKEY_CURRENT_USER, "Software\\JNA", "EmptyBinary", new byte[0]);
        TreeMap<String, Object> values = Advapi32Util.registryGetValues(WinReg.HKEY_CURRENT_USER, "Software\\JNA");
        assertEquals(7, values.keySet().size());
        assertEquals("FourtyTwo" + uu, values.get("42" + uu));
        assertEquals(42, values.get("FourtyTwo" + uu));
        assertEquals("%TEMP%", values.get("ExpandableString"));
        byte[] dataRead = (byte[]) values.get("DeadBeef");
        assertEquals(dataWritten.length, dataRead.length);
        for(int i = 0; i < dataWritten.length; i++) {
            assertEquals(dataWritten[i], dataRead[i]);
        }
        String[] stringsRead = (String[]) values.get("StringArray");
        assertEquals(stringsWritten.length, stringsRead.length);
        for(int i = 0; i < stringsWritten.length; i++) {
            assertEquals(stringsWritten[i], stringsRead[i]);
        }
        stringsRead = (String[]) values.get("EmptyStringArray");
        assertEquals(0, stringsRead.length);
        Advapi32Util.registryDeleteKey(WinReg.HKEY_CURRENT_USER, "Software", "JNA");           
    }

    public void testRegistryGetEmptyValues() {
        HKEY root = WinReg.HKEY_CURRENT_USER;
        String keyPath = "Software\\JNA";
        Advapi32Util.registryCreateKey(root, "Software", "JNA");
        doTestRegistryGetEmptyValues(root, keyPath, WinNT.REG_BINARY);
        doTestRegistryGetEmptyValues(root, keyPath, WinNT.REG_EXPAND_SZ);
        doTestRegistryGetEmptyValues(root, keyPath, WinNT.REG_MULTI_SZ);
        doTestRegistryGetEmptyValues(root, keyPath, WinNT.REG_NONE);
        doTestRegistryGetEmptyValues(root, keyPath, WinNT.REG_SZ);
        Advapi32Util.registryDeleteKey(root, "Software", "JNA");
    }

    private void doTestRegistryGetEmptyValues(HKEY root, String keyPath, int valueType) {
        String valueName = "EmptyValue";
        registrySetEmptyValue(root, keyPath, valueName, valueType);
        Map<String, Object> values = Advapi32Util.registryGetValues(root, keyPath);
        assertEquals(1, values.size());
        assertTrue(values.containsKey(valueName));
    }

    private static void registrySetEmptyValue(HKEY root, String keyPath, String name, final int valueType) {
        HKEYByReference phkKey = new HKEYByReference();
        int rc = Advapi32.INSTANCE.RegOpenKeyEx(root, keyPath, 0, WinNT.KEY_READ | WinNT.KEY_WRITE, phkKey);
        if (rc != W32Errors.ERROR_SUCCESS) {
            throw new Win32Exception(rc);
        }
        try {
            char[] data = new char[0];
            rc = Advapi32.INSTANCE.RegSetValueEx(phkKey.getValue(), name, 0, valueType, data, 0);
            if (rc != W32Errors.ERROR_SUCCESS) {
                throw new Win32Exception(rc);
            }
        } finally {
            rc = Advapi32.INSTANCE.RegCloseKey(phkKey.getValue());
            if (rc != W32Errors.ERROR_SUCCESS) {
                throw new Win32Exception(rc);
            }
        }
    }
 
    public void testIsWellKnownSid() {   
        String everyoneString = "S-1-1-0";
        assertTrue(Advapi32Util.isWellKnownSid(everyoneString, WELL_KNOWN_SID_TYPE.WinWorldSid));   
        assertFalse(Advapi32Util.isWellKnownSid(everyoneString, WELL_KNOWN_SID_TYPE.WinAccountAdministratorSid));
        byte[] everyoneBytes = Advapi32Util.convertStringSidToSid(everyoneString);
        assertTrue(Advapi32Util.isWellKnownSid(everyoneBytes, WELL_KNOWN_SID_TYPE.WinWorldSid));   
        assertFalse(Advapi32Util.isWellKnownSid(everyoneBytes, WELL_KNOWN_SID_TYPE.WinAccountAdministratorSid));
    }
 
    public void testEventLogIteratorForwards() {
        EventLogIterator iter = new EventLogIterator("Application");
        try {
            int max = 100;
            int lastId = 0;
            while(iter.hasNext()) {
                EventLogRecord record = iter.next();
                assertTrue(record.getRecordNumber() > lastId);
                lastId = record.getRecordNumber();
                assertNotNull(record.getType().name());
                assertNotNull(record.getSource());
                if (record.getRecord().DataLength.intValue() > 0) {
                    assertEquals(record.getData().length,
                                 record.getRecord().DataLength.intValue());
                } else {
                    assertNull(record.getData());
                }
                if (record.getRecord().NumStrings.intValue() > 0) {
                    assertEquals(record.getStrings().length,
                                 record.getRecord().NumStrings.intValue());
                } else {
                    assertNull(record.getStrings());
                }
       
                if (max-- <= 0) {
                    break; // shorten test
                }
                /*
                  System.out.println(record.getRecordNumber()
                  + ": Event ID: " + record.getEventId()
                  + ", Event Type: " + record.getType()
                  + ", Event Source: " + record.getSource());
                */
            }
        } finally {
            iter.close();
        }
    }
 
    public void testEventLogIteratorBackwards() {
        EventLogIterator iter = new EventLogIterator(null,
                                                     "Application", WinNT.EVENTLOG_BACKWARDS_READ);
        try {
            int max = 100;
            int lastId = -1;
            while(iter.hasNext()) {
                EventLogRecord record = iter.next();
                /*
                  System.out.println(record.getRecordNumber()
                  + ": Event ID: " + record.getEventId()
                  + ", Event Type: " + record.getType()
                  + ", Event Source: " + record.getSource());
                */
                assertTrue(record.getRecordNumber() < lastId || lastId == -1);
                lastId = record.getRecordNumber();
                if (max-- <= 0) {
                    break; // shorten test
                }
            }
        } finally {
            iter.close();
        }
    }
 
    public void testGetEnvironmentBlock() {
        String expected = "KEY=value\0"
            + "KEY_EMPTY=\0"
            + "KEY_NUMBER=2\0"
            + "\0";

        // Order is important to kept checking result simple
        Map<String, String> mockEnvironment = new TreeMap<String, String>();
        mockEnvironment.put("KEY", "value");
        mockEnvironment.put("KEY_EMPTY", "");
        mockEnvironment.put("KEY_NUMBER", "2");
        mockEnvironment.put("KEY_NULL", null);   

        String block = Advapi32Util.getEnvironmentBlock(mockEnvironment);
        assertEquals("Environment block must comprise key=value pairs separated by NUL characters", expected, block);
    }
}
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