Question

Consider the following interface for an ADT for representing intervals (periods of time as opposed to instantaneous moments of time).

typedef long Duration; // measured in seconds

class DateTime {
public:
    DateTime (int year, int month, int day, int hour, int minute, int second);

    ...

    // How many seconds between two times?
    Duration operator- (const DateTime& right) const;
};


class Interval {
public:
  //
  // An interval is a period of time beginning with a starting time
  //  and running up to, but not including, its stop time.
  //
  Interval ();
  Interval (DateTime start, DateTime stop);
  Interval (DateTime start, Duration length);

  DateTime getStart() const;
  void setStart (DateTime);

  DateTime getStop() const;
  void setStop (DateTime);

  Duration getDuration();

  bool contains (DateTime d);
  bool overlaps (Interval intrvl);

  bool operator== (const Interval& other) const;

private:
  DateTime theStart, theStop;
};

Using the JUnit style, write a self-checking test for the setStart function.

Answer 1