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import prepend from '../../utils/prepend';
describe('prepend', () => {
it('should prepend value to an array', () => {
expect(prepend([2, 3, 4], 1)).toEqual([1, 2, 3, 4]);
expect(
prepend(
[
{
firstName: '2',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
{
firstName: '3',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
{
firstName: '4',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
],
{
firstName: '1',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
),
).toEqual([
{
firstName: '1',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
{
firstName: '2',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
{
firstName: '3',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
{
firstName: '4',
lastName: 'Luo',
id: '75309979-e340-49eb-8016-5f67bfb56c1c',
},
]);
});
it('should prepend undefined as value when value to be prepended is falsy', () => {
expect(prepend([2, 3, 4], 0)).toEqual([0, 2, 3, 4]);
expect(prepend([2, 3, 4] as (number | boolean)[], false)).toEqual([
false,
2,
3,
4,
]);
expect(prepend([2, 3, 4] as (number | string)[], '')).toEqual([
'',
2,
3,
4,
]);
expect(prepend([2, 3, 4], undefined)).toEqual([undefined, 2, 3, 4]);
});
it('should spread value when it is an array at one deep-level', () => {
expect(prepend([3, 4], [1, 2])).toEqual([1, 2, 3, 4]);
expect(prepend([3, 4], [[1], 2])).toEqual([[1], 2, 3, 4]);
});
});
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