govau/performance-dashboard

/*global describe,it,beforeEach*/
import expect from 'expect';

import fixtureState from './../../../test/fixtures/jbuilder-cit-hobby';
import { getHumanisedUnits, updateDatasetInDatasets } from './datasetsHelper';

describe('(Helpers) Datasets - datasetsHelper', () => {
  const fixtureDatasets = fixtureState.datasets;
  const fixtureDataset = fixtureDatasets[0];

  if (typeof fixtureDatasets === 'undefined' || fixtureDatasets.length <= 0)
    throw new Error('invalid fixtureDatasets');
  if (typeof fixtureDataset === 'undefined')
    throw new Error('invalid fixtureDataset');

  describe('getHumanisedUnits', () => {
    it("should return '' when provided n, s, or i", () => {
      expect(getHumanisedUnits('n')).toEqual('');
      expect(getHumanisedUnits('s')).toEqual('');
      expect(getHumanisedUnits('i')).toEqual('');
    });
    it('should return itself when provided %, or $', () => {
      expect(getHumanisedUnits('%')).toEqual('%');
      expect(getHumanisedUnits('$')).toEqual('$');
    });
    it('should throw if an unrecognised value is provided', () => {
      expect(() => getHumanisedUnits('__*^Q#')).toThrow();
      expect(() => getHumanisedUnits('sdsajdajhsgdjhas')).toThrow();
    });
  });

  describe('updateDatasetInDatasets', () => {
    const newDatasetState = { ...fixtureDataset, label: 'cats cats cats' };
    const actual = updateDatasetInDatasets(fixtureDatasets, newDatasetState);

    it('should update a dataset on state', () => {
      expect(actual).toContain(newDatasetState);
    });

    it('should not increase the size of state', () => {
      expect(actual.length).toEqual(fixtureDatasets.length);
    });

    it('should have updated the correct property on the correct dataset in state', () => {
      expect(actual.find(d => d.id == newDatasetState.id).label).toEqual(
        newDatasetState.label,
      );
    });
  });
});