import { complement, intersection, testSubset } from './sets';

describe('Complement set', () => {
  it('should return the complement of a set', () => {
    let universe = [0, 1, 2, 3, 4, 5];
    let set = [1, 3, 5];
    let complementarySet = complement(universe, set);

    expect(complementarySet).toEqual([0, 2, 4]);
  });
});

describe('Intersection between sets', () => {
  it('should return the intersection between two sets', () => {
    let setA = [0, 1, 2, 3, 4];
    let setB = [3, 4, 5, 6, 7];
    let intersectionAB = intersection(setA, setB);

    expect(intersectionAB).toEqual([3, 4]);
  });

  it("should correctly intersect on 0's", () => {
    let setA = [0];
    let setB = [0];
    let intersectionAB = intersection(setA, setB);

    expect(intersectionAB).toEqual([0]);
  });
});

describe('Test whether set is a subset of another set or not', () => {
  it('should return true if one set is a subset of another', () => {
    let subset = [0, 1, 2];
    let superset = [0, 1, 2, 3, 4, 5];
    let isSubset = testSubset(subset, superset);

    expect(isSubset).toBe(true);
  });

  it('should return false if one set is not a subset of another', () => {
    let subset = [0, 1, 2];
    let superset = [1, 2, 3, 4, 5];
    let isSubset = testSubset(subset, superset);

    expect(isSubset).toBe(false);
  });
});