| 1 | const assert = require('assert');
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| 2 | const {compose, pipe} = require('../fp');
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| 3 |
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| 4 | const incrementBy = value => data => value + data;
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| 5 | const foldBy = value => data => value * data;
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| 6 | const rest = value => data => Promise.resolve(data - value);
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| 7 |
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| 8 | describe('FP', function() {
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| 9 | describe('#compose()', function() {
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| 10 | it('should return a composed function of right to left', function(){
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| 11 | let calc = compose(foldBy(2), incrementBy(1));
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| 12 | assert.equal(calc(1),4);
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| 13 | });
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| 14 | it('should return a composed function that works with promises', async function(){
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| 15 | let calc = compose(foldBy(2), rest(1), incrementBy(2));
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| 16 | assert.equal(await calc(1),4);
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| 17 | });
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| 18 | });
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| 19 | describe('#pipe()', function() {
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| 20 | it('should return a composed function from left to right', function(){
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| 21 | let calc = pipe(foldBy(2), incrementBy(1));
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| 22 | assert.equal(calc(1),3);
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| 23 | });
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| 24 | it('should return a composed function that works with promises', async function(){
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| 25 | let calc = pipe(foldBy(2), rest(1), incrementBy(2));
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| 26 | assert.equal(await calc(1),3);
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| 27 | });
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| 28 | });
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| 29 | });
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