corrade-nucleus-nucleons – Rev 1

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describe('checkForLastNumericKey', function() {
  it('when provided with invalid objects then it returns undefined', function() {
    expect(checkForLastNumericKey({})).toBeUndefined();
    expect(checkForLastNumericKey([])).toBeUndefined();
    expect(checkForLastNumericKey(null)).toBeUndefined();
    expect(checkForLastNumericKey(undefined)).toBeUndefined();
  });

  it('when provided with an object with only numeric keys then it returns the last numeric key', function() {
    expect(checkForLastNumericKey({ 1:'first', 2: 'second', 3: 'third' })).toBe('3');
    expect(checkForLastNumericKey({ 3:'first', 2: 'second', 1: 'third' })).toBe('1');
    expect(checkForLastNumericKey({ 3:'first', 2: 'second', 0: 'third' })).toBe('0');
  });

  it('when provided with an object with mixed keys then it returns the last numeric key', function() {
    expect(checkForLastNumericKey({ 1: 'first', 2: 'second', three: 'third' })).toBe('2');
    expect(checkForLastNumericKey({ 1: 'first', second: 'second', '3': 'third' })).toBe('3');
  });
});