var PerfectNumbers = require('./perfect-numbers');

describe('Exercise - Perfect Numbers', function () {
  var perfectNumbers;

  beforeEach(function () {
    perfectNumbers = new PerfectNumbers();
  });

  describe('Perfect Numbers', function () {
    it('Smallest perfect number is classified correctly', function () {
      expect(perfectNumbers.classify(6)).toEqual('perfect');
    });

    it('Medium perfect number is classified correctly', function () {
      expect(perfectNumbers.classify(28)).toEqual('perfect');
    });

    it('Large perfect number is classified correctly', function () {
      expect(perfectNumbers.classify(33550336)).toEqual('perfect');
    });
  });

  describe('Abundant Numbers', function () {
    it('Smallest abundant number is classified correctly', function () {
      expect(perfectNumbers.classify(12)).toEqual('abundant');
    });

    it('Medium abundant number is classified correctly', function () {
      expect(perfectNumbers.classify(30)).toEqual('abundant');
    });

    it('Large abundant number is classified correctly', function () {
      expect(perfectNumbers.classify(33550335)).toEqual('abundant');
    });
  });

  describe('Deficient Numbers', function () {
    it('Smallest prime deficient number is classified correctly', function () {
      expect(perfectNumbers.classify(2)).toEqual('deficient');
    });

    it('Smallest non-prime deficient number is classified correctly', function () {
      expect(perfectNumbers.classify(4)).toEqual('deficient');
    });

    it('Medium deficient number is classified correctly', function () {
      expect(perfectNumbers.classify(32)).toEqual('deficient');
    });

    it('Large deficient number is classified correctly', function () {
      expect(perfectNumbers.classify(33550337)).toEqual('deficient');
    });

    it('Edge case (no factors other than itself) is classified correctly', function () {
      expect(perfectNumbers.classify(1)).toEqual('deficient');
    });
  });

  describe('Invalid Inputs', function () {
    it('Zero is rejected (not a natural number)', function () {
      expect(perfectNumbers.classify(0)).toEqual('Classification is only possible for natural numbers.');
    });

    it('Negative integer is rejected (not a natural number)', function () {
      expect(perfectNumbers.classify(-1)).toEqual('Classification is only possible for natural numbers.');
    });
  });
});