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