Files
30-seconds-of-code/test/uniqueElementsBy.test.js
2018-10-19 20:18:00 +03:00

41 lines
1.1 KiB
JavaScript

const expect = require('expect');
const {uniqueElementsBy} = require('./_30s.js');
test('uniqueElementsBy is a Function', () => {
expect(uniqueElementsBy).toBeInstanceOf(Function);
});
test('uniqueElementsBy works for properties', () => {
expect(
uniqueElementsBy(
[
{ id: 0, value: 'a' },
{ id: 1, value: 'b' },
{ id: 2, value: 'c' },
{ id: 1, value: 'd' },
{ id: 0, value: 'e' }
],
(a, b) => a.id === b.id
)
).toEqual([{ id: 0, value: 'a' }, { id: 1, value: 'b' }, { id: 2, value: 'c' }]);
});
test('uniqueElementsBy works for nested properties', () => {
expect(
uniqueElementsBy(
[
{ id: 0, value: 'a', n: { p: 0 } },
{ id: 1, value: 'b', n: { p: 1 } },
{ id: 2, value: 'c', n: { p: 2 } },
{ id: 1, value: 'd', n: { p: 0 } },
{ id: 0, value: 'e', n: { p: 1 } }
],
(a, b) => a.id === b.id
)
).toEqual([
{ id: 0, value: 'a', n: { p: 0 } },
{ id: 1, value: 'b', n: { p: 1 } },
{ id: 2, value: 'c', n: { p: 2 } }
]);
});