18 lines
582 B
JavaScript
18 lines
582 B
JavaScript
const expect = require('expect');
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const converge = require('./converge.js');
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test('converge is a Function', () => {
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expect(converge).toBeInstanceOf(Function);
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});
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const average = converge((a, b) => a / b, [
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arr => arr.reduce((a, v) => a + v, 0),
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arr => arr.length
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]);
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test('Produces the average of the array', () => {
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expect(average([1, 2, 3, 4, 5, 6, 7])).toBe(4);
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});
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const strangeConcat = converge((a, b) => a + b, [x => x.toUpperCase(), x => x.toLowerCase()]);
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test('Produces the strange concatenation', () => {
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expect(strangeConcat('Yodel')).toBe('YODELyodel');
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});
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