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import { expect } from 'chai';
import { it, describe } from 'mocha';
import { calculateItemList, RowDisplayData } from '../src/renderer/components/List';
const prevItems: Array<RowDisplayData<undefined>> = [
{ key: 'a', data: undefined, removing: false },
{ key: 'b', data: undefined, removing: false },
{ key: 'c', data: undefined, removing: false },
{ key: 'd', data: undefined, removing: false },
];
describe('List diff', () => {
it('Should add item to the beginning', () => {
const nextItems: Array<RowDisplayData<undefined>> = [
{ key: '1', data: undefined, removing: false },
...prevItems,
];
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.have.length(5);
expect(combinedItems.slice(1)).to.deep.equal(prevItems);
expect(combinedItems).to.deep.equal(nextItems);
});
it('Should add item to the end', () => {
const nextItems: Array<RowDisplayData<undefined>> = [
...prevItems,
{ key: '1', data: undefined, removing: false },
];
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.have.length(5);
expect(combinedItems.slice(0, 4)).to.deep.equal(prevItems);
expect(combinedItems).to.deep.equal(nextItems);
});
it('Should add item to the middle', () => {
const nextItems: Array<RowDisplayData<undefined>> = [
...prevItems.slice(0, 2),
{ key: '1', data: undefined, removing: false },
...prevItems.slice(2),
];
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.have.length(5);
expect([...combinedItems.slice(0, 2), ...combinedItems.slice(3)]).to.deep.equal(prevItems);
expect(combinedItems).to.deep.equal(nextItems);
});
it('Should remove first item', () => {
const nextItems = prevItems.slice(1);
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.have.length(4);
expect(combinedItems.slice(1, 4)).to.deep.equal(prevItems.slice(1, 4));
expect(combinedItems[0]).to.deep.equal({ ...prevItems[0], removing: true });
});
it('Should remove last item', () => {
const nextItems = prevItems.slice(0, -1);
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.have.length(4);
expect(combinedItems.slice(0, -1)).to.deep.equal(prevItems.slice(0, -1));
expect(combinedItems.at(-1)).to.deep.equal({ ...prevItems.at(-1), removing: true });
});
it('Should remove middle item', () => {
const nextItems = [...prevItems.slice(0, 1), ...prevItems.slice(2)];
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.have.length(4);
expect(combinedItems.slice(0, 1)).to.deep.equal(prevItems.slice(0, 1));
expect(combinedItems.slice(2)).to.deep.equal(prevItems.slice(2));
expect(combinedItems[1]).to.deep.equal({ ...prevItems[1], removing: true });
});
it('should both add and remove items', () => {
const nextItems = [
{ key: '1', data: undefined, removing: false },
...prevItems.slice(1, -1),
{ key: '2', data: undefined, removing: false },
];
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.have.length(6);
expect(combinedItems[0]).to.deep.equal({ ...prevItems[0], removing: true });
expect(combinedItems[1]).to.deep.equal(nextItems[0]);
expect(combinedItems.slice(2, -2)).to.deep.equal(prevItems.slice(1, -1));
expect(combinedItems.at(-2)).to.deep.equal({ ...prevItems.at(-1), removing: true });
expect(combinedItems.at(-1)).to.deep.equal(nextItems.at(-1));
});
it('should remove item being removed', () => {
const prevItems: Array<RowDisplayData<undefined>> = [
{ key: '1', data: undefined, removing: true },
];
const nextItems: Array<RowDisplayData<undefined>> = [];
const combinedItems = calculateItemList(prevItems, nextItems);
expect(combinedItems).to.deep.equal(prevItems);
});
});
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