import { isObjectWithOnlyOne } from './ObjectWithOnlyOne';
import {
  objectWithKnownKey,
  objectWithUnknownKey,
  requiredKeys,
} from './__test__';

describe('isObjectWithOnlyOne', (): void => {
  describe('given an object with a known key', (): void => {
    describe('when called with a set of required keys', (): void => {
      it('should be true', (): void => {
        expect(isObjectWithOnlyOne(objectWithKnownKey, requiredKeys)).toBe(
          true,
        );
      });
    });

    describe('when called without a set of required keys', (): void => {
      it('should be true', (): void => {
        expect(isObjectWithOnlyOne(objectWithKnownKey)).toBe(true);
      });
    });
  });

  describe('given an object with an unknown key', (): void => {
    describe('when called with a set of required keys', (): void => {
      it('should be false', (): void => {
        expect(isObjectWithOnlyOne(objectWithUnknownKey, requiredKeys)).toBe(
          false,
        );
      });
    });

    describe('when called without a set of required keys', (): void => {
      it('should be true', (): void => {
        expect(isObjectWithOnlyOne(objectWithKnownKey)).toBe(true);
      });
    });
  });
});