The ways in which a call to a mock method can be handled.

class Action {
  /** Do nothing (void method) */
  static const IGNORE = const Action._('IGNORE');

  /** Return a supplied value. */
  static const RETURN = const Action._('RETURN');

  /** Throw a supplied value. */
  static const THROW = const Action._('THROW');

  /** Call a supplied function. */
  static const PROXY = const Action._('PROXY');

  const Action._(this.name);

  final String name;
}