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feat: add interval sampler unit tests
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| import { scaleLinear as d3ScaleLinear } from 'd3-scale' | ||
| import { expect } from '@jest/globals' | ||
| import { Interval } from 'interval-arithmetic-eval' | ||
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| import interval from './interval' | ||
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| const width = 200 | ||
| const height = 100 | ||
| const xDomain = [-5, 5] | ||
| const yDomain = [-5, 5] | ||
| const xScale = d3ScaleLinear().domain(xDomain).range([0, width]) | ||
| const yScale = d3ScaleLinear().domain(yDomain).range([height, 0]) | ||
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| function toBeCloseToInterval(got, want, eps = 1e-3) { | ||
| if (!Interval.isInterval(got) || !Interval.isInterval(want)) { | ||
| throw new Error('got and want must be Intervals') | ||
| } | ||
| if (Math.abs(got.lo - want.lo) > eps || Math.abs(got.hi - want.hi) > eps) { | ||
| return { | ||
| message: () => | ||
| `expected ${this.utils.printReceived(got)} to be within range of ${this.utils.printReceived(want)}`, | ||
| pass: false | ||
| } | ||
| } | ||
| return { pass: true } | ||
| } | ||
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| expect.extend({ toBeCloseToInterval }) | ||
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| describe('interval sampler', () => { | ||
| describe('with linear sampler', () => { | ||
| it('should render 2 points for x', () => { | ||
| const nSamples = 2 | ||
| // map the screen coordinates [0, width] to the domain [-5, 5] | ||
| const samplerParams = { | ||
| d: { fn: '1000000*x', fnType: 'linear' }, | ||
| range: xDomain, | ||
| xScale, | ||
| yScale, | ||
| xAxis: { type: 'linear' }, | ||
| nSamples | ||
| } | ||
| const data = interval(samplerParams) | ||
| expect(data instanceof Array).toEqual(true) | ||
| expect(data.length).toEqual(1) /* we expect 1 group */ | ||
| expect(data[0].length).toEqual(1) /* the group should have 1 single result */ | ||
| expect(data[0][0].length).toEqual(2) /* the result should be an array of 2 intervals */ | ||
| // the the group should be evaluated at 2 points, however with intervals | ||
| // we only need 2 pairs expressed in a single datum | ||
| // | ||
| // [x, y] where x = [x_lo, x_hi] and y = [y_lo, y_hi] | ||
| // | ||
| // The graphical way is to see the bounded rectangle | ||
| // .......... y_hi | ||
| // . . | ||
| // . . | ||
| // . . | ||
| // .......... y_lo | ||
| // x_lo x_hi | ||
| expect(data[0][0][0]).toBeCloseToInterval({ lo: -5, hi: 5 }) /* the x_lo, x_hi tuple */ | ||
| expect(data[0][0][1]).toBeCloseToInterval({ lo: -5000000, hi: 5000000 }) /* the y_lo, y_hi tuple */ | ||
| }) | ||
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| it('should render 100000 points for x^2', () => { | ||
| const nSamples = 100001 | ||
| // map the screen coordinates [0, width] to the domain [-5, 5] | ||
| const samplerParams = { | ||
| d: { fn: 'x^2', fnType: 'linear' }, | ||
| range: xDomain, | ||
| xScale, | ||
| yScale, | ||
| xAxis: { type: 'linear' }, | ||
| nSamples | ||
| } | ||
| const data = interval(samplerParams) | ||
| expect(data instanceof Array).toEqual(true) | ||
| expect(data.length).toEqual(1) /* we expect 1 group */ | ||
| expect(data[0].length).toEqual(100000) /* the group should have nSamples - 1 single result */ | ||
| expect(data[0][0][0]).toBeCloseToInterval({ lo: -5, hi: -5 }) | ||
| expect(data[0][0][1]).toBeCloseToInterval({ lo: 25, hi: 25 }) | ||
| expect(data[0][50000][0]).toBeCloseToInterval({ lo: 0, hi: 0 }) | ||
| expect(data[0][50000][1]).toBeCloseToInterval({ lo: 0, hi: 0 }) | ||
| expect(data[0][99999][0]).toBeCloseToInterval({ lo: 5, hi: 5 }) | ||
| expect(data[0][99999][1]).toBeCloseToInterval({ lo: 25, hi: 25 }) | ||
| }) | ||
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| it('should render 1 group for 1/x', () => { | ||
| const nSamples = 4 | ||
| // map the screen coordinates [0, width] to the domain [-5, 5] | ||
| const samplerParams = { | ||
| d: { fn: '1/x', fnType: 'linear' }, | ||
| range: xDomain, | ||
| xScale, | ||
| yScale, | ||
| xAxis: { type: 'linear' }, | ||
| nSamples | ||
| } | ||
| const data = interval(samplerParams) | ||
| expect(data instanceof Array).toEqual(true) | ||
| expect(data.length).toEqual(1) /* we expect 1 group */ | ||
| expect(data[0].length).toEqual(3) /* the group should have nSamples - 1 single result */ | ||
| expect(data[0][1]).toEqual(null) /* the interval containing 1/0 should not be rendered */ | ||
| }) | ||
| }) | ||
| }) |
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