import reducer, { INITIAL_STATE } from '.'
import type { UpdateEditAction } from '../actions'

describe('reducer', () => {
    it('should prepare initial state', () => {
        expect(Object.keys(INITIAL_STATE)).toContain('rows')
    })

    describe('when a change occurs', () => {
        it('should return new state', () => {
            const initialState = INITIAL_STATE
            const action: UpdateEditAction = {
                type: 'updateEdit',
                payload: {
                    rowId: '1',
                    columnId: '2',
                },
            }
            const state = reducer(INITIAL_STATE, action)
            expect(initialState).not.toBe(state)
        })
    })

    describe('when no change occurs', () => {
        it('should return the same state', () => {
            const initialState = INITIAL_STATE
            const action: UpdateEditAction = {
                type: 'updateEdit',
                payload: null,
            }
            const state = reducer(INITIAL_STATE, action)
            expect(initialState).toBe(state)
        })
    })
})