LogEntry(this.mockName, this.methodName,
    this.args, this.action, [this.value]) {
  time = new Date.now();
}

String toString([Date baseTime]) {
  Description d = new StringDescription();
  if (baseTime == null) {
    // Show absolute time.
    d.add('${time.hour}:${_pad2(time.minute)}:'
        '${_pad2(time.second)}.${time.millisecond}>  ');
  } else {
    // Show relative time.
    int delta = time.millisecondsSinceEpoch - baseTime.millisecondsSinceEpoch;
    int secs = delta ~/ 1000;
    int msecs = delta % 1000;
    d.add('$secs.$msecs>  ');
  }
  d.add('${_qualifiedName(mockName, methodName)}(');
  if (args != null) {
    for (var i = 0; i < args.length; i++) {
      if (i != 0) d.add(', ');
      d.addDescriptionOf(args[i]);
    }
  }
  d.add(') ${action == Action.THROW ? "threw" : "returned"} ');
  d.addDescriptionOf(value);
  return d.toString();
}