10 lines
289 B
JavaScript
10 lines
289 B
JavaScript
const expect = require('expect');
|
|
const {negate} = require('./_30s.js');
|
|
|
|
test('negate is a Function', () => {
|
|
expect(negate).toBeInstanceOf(Function);
|
|
});
|
|
test('Negates a predicate function', () => {
|
|
expect([1, 2, 3, 4, 5, 6].filter(negate(n => n % 2 === 0))).toEqual([1, 3, 5]);
|
|
});
|