expect(reducer(initial, movePlannerModule('0', '2018/2019', 2, 1)).modules).toEqual({
      0: { id: '0', moduleCode: 'CS1010S', year: '2018/2019', semester: 2, index: 1 },
      1: { id: '1', moduleCode: 'CS2030', year: '2018/2019', semester: 2, index: 0 },
      2: { id: '2', moduleCode: 'CS2105', year: '2018/2019', semester: 2, index: 2 },
    });