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| 1 | +import { test } from '@japa/runner' |
| 2 | +import { estimateRatingChange, predictRatingChange } from './elo' |
| 3 | + |
| 4 | +test.group('elo', () => { |
| 5 | + test('estimateRatingChange', ({ assert }) => { |
| 6 | + assert.deepEqual(estimateRatingChange(2000, 2000), { |
| 7 | + gain: 25, |
| 8 | + loss: -25, |
| 9 | + }) |
| 10 | + |
| 11 | + assert.deepEqual(estimateRatingChange(5000, 1000), { |
| 12 | + gain: 1, |
| 13 | + loss: -50, |
| 14 | + }) |
| 15 | + |
| 16 | + assert.deepEqual(estimateRatingChange(1000, 5000), { |
| 17 | + gain: 50, |
| 18 | + loss: -1, |
| 19 | + }) |
| 20 | + |
| 21 | + assert.strictEqual(estimateRatingChange(1853, 1159).gain, 1) |
| 22 | + assert.strictEqual(estimateRatingChange(1836, 1726).gain, 17) |
| 23 | + assert.strictEqual(estimateRatingChange(1813, 1789).gain, 23) |
| 24 | + assert.strictEqual(estimateRatingChange(1750, 1669).loss, -31) |
| 25 | + assert.strictEqual(estimateRatingChange(1775, 1602).gain, 13) |
| 26 | + assert.strictEqual(estimateRatingChange(1754, 1703).gain, 21) |
| 27 | + assert.strictEqual(estimateRatingChange(1781, 1685).loss, -32) |
| 28 | + assert.strictEqual(estimateRatingChange(1811, 1746).loss, -30) |
| 29 | + assert.strictEqual(estimateRatingChange(1877, 1875).loss, -25) |
| 30 | + assert.strictEqual(estimateRatingChange(1871, 1870).gain, 25) |
| 31 | + assert.strictEqual(estimateRatingChange(1727, 1639).loss, -31) |
| 32 | + }) |
| 33 | + |
| 34 | + test('estimateRatingChange is off by +-1', ({ assert }) => { |
| 35 | + assert.strictEqual(estimateRatingChange(1789, 1865).gain, 31) // Actual: 30 |
| 36 | + assert.strictEqual(estimateRatingChange(1907, 1816).loss, -32) // Actual: -31 |
| 37 | + assert.strictEqual(estimateRatingChange(1787, 1783).gain, 24) // Actual: 25 |
| 38 | + assert.strictEqual(estimateRatingChange(1781, 1721).gain, 20) // Actual: 21, |
| 39 | + assert.strictEqual(estimateRatingChange(2043, 1939).loss, -33) // Actual: -32 |
| 40 | + assert.strictEqual(estimateRatingChange(2134, 2073).loss, -30) // Actual: -29 |
| 41 | + }).fails() |
| 42 | + |
| 43 | + test('predictRatingChange', ({ assert }) => { |
| 44 | + assert.deepEqual(predictRatingChange(0.5), { |
| 45 | + gain: 25, |
| 46 | + loss: -25, |
| 47 | + }) |
| 48 | + |
| 49 | + assert.deepEqual(predictRatingChange(0.52), { |
| 50 | + gain: 24, |
| 51 | + loss: -26, |
| 52 | + }) |
| 53 | + assert.deepEqual(predictRatingChange(0.48), { |
| 54 | + gain: 26, |
| 55 | + loss: -24, |
| 56 | + }) |
| 57 | + |
| 58 | + assert.deepEqual(predictRatingChange(0.44), { |
| 59 | + gain: 28, |
| 60 | + loss: -22, |
| 61 | + }) |
| 62 | + assert.deepEqual(predictRatingChange(0.56), { |
| 63 | + gain: 22, |
| 64 | + loss: -28, |
| 65 | + }) |
| 66 | + |
| 67 | + assert.deepEqual(predictRatingChange(0.55), { |
| 68 | + gain: 22, |
| 69 | + loss: -28, |
| 70 | + }) |
| 71 | + assert.deepEqual(predictRatingChange(0.45), { |
| 72 | + gain: 28, |
| 73 | + loss: -22, |
| 74 | + }) |
| 75 | + }) |
| 76 | +}) |
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