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test.js
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test.js
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const test = require('ava')
const smoothish = require('../index.js')
const missing = x => x === null || x === undefined
const quantize = xs => xs.map(x => missing(x) ? x : Math.round(x * 1000) / 1000)
const OPTIONS = [
{ falloff: 'step' },
{ algorithm: 'movingAverage', falloff: 'step' },
{ },
{ algorithm: 'movingAverage' }
]
// const tee = x => {
// console.log(x)
// return x
// }
const max = xs => xs.reduce((acc, x) => missing(x) || missing(acc) ? acc : Math.max(acc, x), -Infinity)
const bar = n => [...Array(Math.max(0, Math.round(n)))].map(() => '#').join('')
const bars = xs => quantize(xs).map(x => (missing(x) ? '' : bar(x * 50 / max(xs))) + ' ' + x)
test('flat line is unchanged by smoothing', t => {
const raw = [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
const expected = [
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
[1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(actual, expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('straight line', t => {
const raw = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
const expected = [
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12],
[2, 2.5, 3, 4, 5, 6, 7, 8, 9, 10, 10.5, 11]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(actual, expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('points beyond edge ignored', t => {
const raw = [null, 2, 3, 4, 5, 6, 7, 8, 9, 10, null, null, null, null, null]
const expected = [
[null, 2, 3, 4, 5, 6, 7, 8, 9, 10, null, null, null, null, null],
[null, 3, 3.5, 4, 5, 6, 7, 8, 8.5, 9, null, null, null, null, null]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(actual, expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('points beyond edge ignored (2)', t => {
const raw = [undefined, 200, 300, undefined, 500, undefined, 700, 800, 900]
const expected = [
[undefined, 200, 300, 400, 500, 600, 700, 800, 900],
[undefined, 250, 333.333, 333.333, 500, 666.667, 725, 800, 800]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(quantize(actual), expected[i], JSON.stringify(OPTIONS[i]))
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('missing point is filled in', t => {
const raw = [
100, 200, 300, 400, 500,
undefined,
700, 800, 900, 1000, 1100, 1200]
const expected = [
[
100, 200, 300, 400, 500,
600,
700, 800, 900, 1000, 1100, 1200],
[
200, 250, 300, 350, 475,
600,
725, 850, 900, 1000, 1050, 1100]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(actual, expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('impulse function is smoothed', t => {
const raw = [
0, 0, 0, 0, 0, 0,
100,
0, 0, 0, 0, 0, 0]
const expected = [
[
0, 0, 0, 0, 20, 20,
20,
20, 20, 0, 0, 0, 0],
[
0, 0, 0, 0, 20, 20,
20,
20, 20, 0, 0, 0, 0]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(actual, expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('step function is smoothed', t => {
const raw = [
100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100,
200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200]
const expected = [
[
100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 120, 140,
160, 180, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200],
[
100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 120, 140,
160, 180, 200, 200, 200, 200, 200, 200, 200, 200, 200, 200]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(actual, expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('zeros are handled correctly', t => {
const raw = [0, 0, 0, 0, 0, 0, 100, 100, 100, 100, 100, 100]
const expected = [
[0, 0, 0, 0, 20, 40, 60, 80, 100, 100, 100, 100],
[0, 0, 0, 0, 20, 40, 60, 80, 100, 100, 100, 100]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(actual, expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('an example for documentation', t => {
const raw = [100, 110, 150, undefined, 200, 300, 400, 1000]
const expected = [
[95, 120, 146.571, 190, 247.143, 350, 600, 916.667],
[120, 120, 140, 190, 262.5, 475, 475, 566.667]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(quantize(actual), expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const actual = smoothish(raw, options)
t.snapshot(bars(actual), JSON.stringify(options))
}
})
test('An empty list is unchanged', t => {
const raw = []
const expected = [
[],
[],
[],
[]
]
for (const i in expected) {
const actual = smoothish(raw, OPTIONS[i])
t.deepEqual(quantize(actual), expected[i])
}
})
test('impulse at r=2 (the default)', t => {
const inject = { radius: 2 }
const raw = [
0, 0, 0, 0, 0, 0,
100,
0, 0, 0, 0, 0, 0]
const expected = [
[
0, 0, 0, 0, 20, 20,
20,
20, 20, 0, 0, 0, 0],
[
0, 0, 0, 0, 20, 20,
20,
20, 20, 0, 0, 0, 0]
]
for (const i in expected) {
const opts = { ...inject, ...OPTIONS[i] }
const actual = smoothish(raw, opts)
t.deepEqual(quantize(actual), expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const opts = { ...inject, ...options }
const actual = smoothish(raw, opts)
t.snapshot(bars(actual), JSON.stringify(opts))
}
})
test('impulse at r=1', t => {
const inject = { radius: 1 }
const raw = [
0, 0, 0, 0, 0, 0,
100,
0, 0, 0, 0, 0, 0]
const expected = [
[
0, 0, 0, 0, 0, 33.333,
33.333,
33.333, 0, 0, 0, 0, 0],
[
0, 0, 0, 0, 0, 33.333,
33.333,
33.333, 0, 0, 0, 0, 0]
]
for (const i in expected) {
const opts = { ...inject, ...OPTIONS[i] }
const actual = smoothish(raw, opts)
t.deepEqual(quantize(actual), expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const opts = { ...inject, ...options }
const actual = smoothish(raw, opts)
t.snapshot(bars(actual), JSON.stringify(opts))
}
})
test('impulse at r=0 (no change)', t => {
const inject = { radius: 0 }
const raw = [
0, 0, 0, 0, 0, 0,
100,
0, 0, 0, 0, 0, 0]
const expected = [
[
0, 0, 0, 0, 0, 0,
100,
0, 0, 0, 0, 0, 0],
[
0, 0, 0, 0, 0, 0,
100,
0, 0, 0, 0, 0, 0]
]
for (const i in expected) {
const opts = { ...inject, ...OPTIONS[i] }
const actual = smoothish(raw, opts)
t.deepEqual(quantize(actual), expected[i])
}
t.snapshot(bars(raw), 'input')
for (const options of OPTIONS) {
const opts = { ...inject, ...options }
const actual = smoothish(raw, opts)
t.snapshot(bars(actual), JSON.stringify(opts))
}
})
test('negative r throws exception', t => {
const raw = [
0, 0, 0, 0, 0, 0,
100,
0, 0, 0, 0, 0, 0]
const inject = { radius: -1 }
for (const options of OPTIONS) {
const opts = { ...inject, ...options }
t.throws(() => smoothish(raw, opts), { message: /negative radius/ })
}
})
test('handling increasing radius', t => {
const raw = [1, 2, 3, 4, 5, 6]
for (let radius = 0; radius < 10; ++radius) {
t.snapshot(bars(raw), 'input')
const inject = { radius }
for (const options of OPTIONS) {
const opts = { ...inject, ...options }
const actual = smoothish(raw, opts)
t.snapshot(bars(actual), JSON.stringify(opts))
}
}
})
test('null data throws an exception', t => {
for (const options of OPTIONS) {
t.throws(() => smoothish(null, options), { message: /null data/ })
}
})
test('undefined data throws an exception', t => {
for (const options of OPTIONS) {
t.throws(() => smoothish(undefined, options), { message: /no data/ })
}
t.throws(() => smoothish(), { message: /no data/ })
})