var  Change =require('./change');

describe('Change', function() {

  it('change for 1 cent',function() {
     var change= new Change();
     var result = change.calculate([1,5, 10, 25],1);
     expect(result).toEqual([1]);
  });

  xit('return a single coin',function() {
    var change= new Change();
    var result = change.calculate([1,5, 10, 25, 100],25);
    expect(result).toEqual([25]);
  });

  xit('multiple coins coin',function() {
    var change= new Change();
    var result = change.calculate([1,5, 10, 25, 100],15);
    expect(result).toEqual([5, 10]);
  });

  xit('test with Lillipution Currency where a greedy algorithm fails',function() {
    // https://en.wikipedia.org/wiki/Change-making_problem#Greedy_method
     var change= new Change();
     var result = change.calculate([1, 4, 15, 20, 50],23);
     expect(result).toEqual([4,4,15]);
  });

  xit('test with lower Elbonian Currency where a greedy algorithm fails',function() {
    // https://en.wikipedia.org/wiki/Change-making_problem#Greedy_method
    var change= new Change();
    var result = change.calculate([1, 5, 10, 21, 25],63);
    expect(result).toEqual([21, 21, 21]);
  });

  xit('test large amount of change',function() {
    var change= new Change();
    var result = change.calculate([1, 2, 5, 10, 20, 50 , 100], 999);
    expect(result).toEqual([2, 2, 5, 20, 20, 50, 100, 100, 100, 100, 100, 100, 100, 100, 100]);
  });

  xit('test zero change',function() {
    var change= new Change();
    var result = change.calculate([1, 5, 10, 21, 25], 0);
    expect(result).toEqual([]);
  });

  xit('test less than the smallest currency represented',function() {
    var change= new Change();
    var message = 'The total 3 cannot be represented in the given currency.';
    var test=function(){return change.calculate([5,10],3);};
    expect(test).toThrowError(Error,message);
  });

  xit('test a large value that the currency cannot represent',function() {
    var change= new Change();
    var message ='The total 94 cannot be represented in the given currency.';
    var test=function(){return change.calculate([5,10], 94);};
    expect(test).toThrowError(Error,message);
  });

  xit('negative change is rejected',function() {
    var change= new Change();
    var message = 'Negative totals are not allowed.';
    var test = function(){return change.calculate([1,2,5],-5);};
    expect(test).toThrowError(Error, message);
  });
    
});