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import { act, renderHook } from '@testing-library/react-hooks';
import { useRef } from 'react';
import useList, { ListActions } from '../src/useList';
describe('useList', () => {
it('should be defined', () => {
expect(useList).toBeDefined();
});
function getHook<T>(initialArray?: T[]) {
return renderHook(
(props): [number, [T[], ListActions<T>]] => {
const counter = useRef(0);
return [++counter.current, useList(props)];
},
{ initialProps: initialArray }
);
}
it('should init with 1st parameter and actions', () => {
const hook = getHook([1, 2, 3]);
const [, [list, actions]] = hook.result.current;
expect(list).toEqual([1, 2, 3]);
expect(actions).toStrictEqual({
set: expect.any(Function),
push: expect.any(Function),
updateAt: expect.any(Function),
insertAt: expect.any(Function),
update: expect.any(Function),
updateFirst: expect.any(Function),
upsert: expect.any(Function),
sort: expect.any(Function),
filter: expect.any(Function),
removeAt: expect.any(Function),
remove: expect.any(Function),
clear: expect.any(Function),
reset: expect.any(Function),
});
});
it('should return the same actions object each render', () => {
const hook = getHook([1, 2, 3]);
const [, [, actions]] = hook.result.current;
act(() => {
actions.set([1, 2, 3, 4]);
});
expect(actions).toBe(hook.result.current[1][1]);
});
it('should default with empty array', () => {
expect(getHook().result.current[1][0]).toEqual([]);
});
describe('set()', () => {
it('should reset list with given array and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { set }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
set([1, 2, 3, 4]);
});
expect(hook.result.current[1][0]).toEqual([1, 2, 3, 4]);
expect(hook.result.current[0]).toBe(2);
act(() => {
set([1, 2, 3, 4, 5]);
});
expect(hook.result.current[1][0]).toEqual([1, 2, 3, 4, 5]);
expect(hook.result.current[0]).toBe(3);
});
});
describe('push()', () => {
it('should add arbitrary amount of items to the end and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { push }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
push(1, 2, 3, 4);
});
expect(hook.result.current[1][0]).toEqual([1, 2, 3, 1, 2, 3, 4]);
expect(hook.result.current[0]).toBe(2);
});
it('should not do anything if called with no parameters', () => {
const hook = getHook([1, 2, 3]);
const [, [list, { push }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
push();
});
expect(hook.result.current[0]).toBe(1);
expect(list).toBe(hook.result.current[1][0]);
});
});
describe('updateAt()', () => {
it('should replace item at given index with given value and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { updateAt }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
updateAt(1, 5);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 5, 3]);
});
it('should work fine if target index is out of array length', () => {
const hook = getHook([1, 2, 3]);
const [, [, { updateAt }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
updateAt(5, 6);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 2, 3, undefined, undefined, 6]);
});
});
describe('insertAt()', () => {
it('should insert item at given index shifting all the right elements and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { insertAt }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
insertAt(1, 5);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 5, 2, 3]);
});
it('should work if index is out of array length', () => {
const hook = getHook([1, 2, 3]);
const [, [, { insertAt }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
insertAt(5, 6);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 2, 3, undefined, undefined, 6]);
});
});
describe('update()', () => {
it('should replace all items that matches the predicate and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { update }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
update((a, _) => a % 2 === 1, 0);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([0, 2, 0]);
});
it('should pass two parameters to the predicate, iterated element and new one', () => {
const hook = getHook([1, 2, 3]);
const [, [, { update }]] = hook.result.current;
const spy = jest.fn();
act(() => {
update(spy, 0);
});
expect(spy.mock.calls[0][0]).toBe(1);
expect(spy.mock.calls[0][1]).toBe(0);
});
});
describe('updateFirst()', () => {
it('should replace first items that matches the predicate and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { updateFirst }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
updateFirst((a, _) => a % 2 === 1, 0);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([0, 2, 3]);
});
it('should pass two parameters to the predicate, iterated element and new one', () => {
const hook = getHook([1, 2, 3]);
const [, [, { updateFirst }]] = hook.result.current;
const spy = jest.fn();
act(() => {
updateFirst(spy, 0);
});
expect(spy.mock.calls[0].length).toBe(2);
expect(spy.mock.calls[0][0]).toBe(1);
expect(spy.mock.calls[0][1]).toBe(0);
});
});
describe('upsert()', () => {
it('should replace first item that matches the predicate and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { upsert }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
upsert((a, _) => a === 1, 0);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([0, 2, 3]);
});
it('otherwise should push it to the list and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { upsert }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
upsert((a, _) => a === 5, 0);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 2, 3, 0]);
});
it('should pass two parameters to the predicate, iterated element and new one', () => {
const hook = getHook([1, 2, 3]);
const [, [, { upsert }]] = hook.result.current;
const spy = jest.fn();
act(() => {
upsert(spy, 0);
});
expect(spy.mock.calls[0].length).toBe(2);
expect(spy.mock.calls[0][0]).toBe(1);
expect(spy.mock.calls[0][1]).toBe(0);
});
});
describe('sort()', () => {
it('should sort the list with given comparator and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { sort }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
sort((a, b) => (a === b ? 0 : a < b ? 1 : -1));
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([3, 2, 1]);
});
it('should use default array`s sorting function of called without parameters', () => {
const hook = getHook([2, 3, 1]);
const [, [, { sort }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
sort();
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 2, 3]);
});
});
describe('filter()', () => {
it('should filter the list with given predicate and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { filter }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
filter((val) => val % 2 === 1);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 3]);
});
it('should pass three parameters to the predicate, iterated element, it`s index and filtered array', () => {
const hook = getHook([1, 2, 3]);
const [, [list, { filter }]] = hook.result.current;
const spy = jest.fn((_, _2, _3) => false);
act(() => {
filter(spy);
});
expect(spy.mock.calls[0].length).toBe(3);
expect(spy.mock.calls[0][0]).toBe(1);
expect(spy.mock.calls[0][1]).toBe(0);
expect(spy.mock.calls[0][2]).toEqual(list);
});
});
describe('removeAt()', () => {
it('should remove item at given index and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { removeAt }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
removeAt(1);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 3]);
});
it('should do nothing if index is out of array length, although it should cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { removeAt }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
removeAt(5);
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([1, 2, 3]);
});
});
describe('remove()', () => {
it('should be a ref to removeAt', () => {
const hook = getHook([1, 2, 3]);
const [, [, { remove, removeAt }]] = hook.result.current;
expect(remove).toBe(removeAt);
});
});
describe('clear()', () => {
it('should clear the list and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { clear }]] = hook.result.current;
expect(hook.result.current[0]).toBe(1);
act(() => {
clear();
});
expect(hook.result.current[0]).toBe(2);
expect(hook.result.current[1][0]).toEqual([]);
});
});
describe('reset()', () => {
it('should reset list to initial values and cause re-render', () => {
const hook = getHook([1, 2, 3]);
const [, [, { set, reset }]] = hook.result.current;
act(() => {
set([1, 2, 3, 4, 6, 7, 8]);
});
expect(hook.result.current[1][0]).toEqual([1, 2, 3, 4, 6, 7, 8]);
expect(hook.result.current[0]).toBe(2);
act(() => {
reset();
});
expect(hook.result.current[0]).toBe(3);
expect(hook.result.current[1][0]).toEqual([1, 2, 3]);
});
});
});
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