/**
* Sleep at least a second
*
* Found at: http://boards.developerforce.com/t5/Apex-Code-Development/Best-way-to-delay-until-time-changes-in-a-test/td-p/389619
*
*/
public static void waitAtLeastASecond() {
    Integer msPerS = 1000;
    Datetime start = Datetime.now();
    Datetime current = Datetime.now();
    
    // No sleep available so this ugliness
    Integer counter = 0;
    while ((current.getTime() / msPerS) == (start.getTime() / msPerS)) {
        // This code takes about 250ms or more on na3
        Long t1 = System.currentTimeMillis();
        String bigRandomString = '';
        
        for (Integer i = 0; i < 2000; i++) {
            bigRandomString += Crypto.getRandomLong();
        }
        
        for (Integer i = 0; i < 50; i++) {
            Blob cryptoKey = Crypto.generateAesKey(256);
            Blob data = Blob.valueOf(bigRandomString);
            Blob encryptedData = Crypto.encryptWithManagedIV('AES256', cryptoKey, data);
            Blob decryptedData = Crypto.decryptWithManagedIV('AES256', cryptoKey, encryptedData);
        }
        Long t2 = System.currentTimeMillis();
        
        System.debug('>>> delayUntilTimeChanged delayed for ' + (t2 - t1) + ' ms' +
            ', Count ' + counter +
            ', ScriptStatements ' + Limits.getScriptStatements() + ' of ' + Limits.getLimitScriptStatements() +
            ', CpuTime ' + Limits.getCpuTime() + ' of ' + Limits.getLimitCpuTime());
        
        counter++;
        current = Datetime.now();
    }
}