Sofiya Tepikin
102 lines
3.2 KiB
JavaScript
102 lines
3.2 KiB
JavaScript
import chai from 'chai'
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import { getCycleLengthStats as cycleInfo } from '../lib/cycle-length'
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const expect = chai.expect
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describe('getCycleLengthStats', () => {
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it('works for a simple odd-numbered array', () => {
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const cycleLengths = [99, 5, 1, 2, 100]
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const result = cycleInfo(cycleLengths)
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const expectedResult = {
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minimum: 1,
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maximum: 100,
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mean: 41.4,
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median: 5,
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stdDeviation: 53.06,
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}
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expect(result).to.eql(expectedResult)
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}),
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it('works for a simple even-numbered array', () => {
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const cycleLengths = [4, 1, 15, 2, 20, 5]
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const result = cycleInfo(cycleLengths)
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const expectedResult = {
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minimum: 1,
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maximum: 20,
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mean: 7.83,
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median: 4.5,
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stdDeviation: 7.78,
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}
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expect(result).to.eql(expectedResult)
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}),
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it('works for an one-element array', () => {
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const cycleLengths = [42]
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const result = cycleInfo(cycleLengths)
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const expectedResult = {
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minimum: 42,
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maximum: 42,
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mean: 42,
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median: 42,
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stdDeviation: null,
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}
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expect(result).to.eql(expectedResult)
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}),
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describe('works for more realistic examples', () => {
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it('1 day difference between shortest and longest period', () => {
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const cycleLengths = [28, 29, 28, 28, 28, 29, 28, 28, 28, 29, 29, 28]
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const result = cycleInfo(cycleLengths)
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const expectedResult = {
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minimum: 28,
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maximum: 29,
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mean: 28.33,
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median: 28,
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stdDeviation: 0.49,
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}
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expect(result).to.eql(expectedResult)
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}),
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it('3 days difference between shortest and longest period', () => {
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const cycleLengths = [28, 29, 28, 28, 27, 30, 28, 27, 28, 28, 29, 27]
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const result = cycleInfo(cycleLengths)
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const expectedResult = {
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minimum: 27,
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maximum: 30,
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mean: 28.08,
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median: 28,
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stdDeviation: 0.9,
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}
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expect(result).to.eql(expectedResult)
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}),
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it('8 days difference between shortest and longest period', () => {
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const cycleLengths = [28, 32, 29, 27, 28, 26, 33, 28, 29, 34, 27, 29]
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const result = cycleInfo(cycleLengths)
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const expectedResult = {
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minimum: 26,
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maximum: 34,
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mean: 29.17,
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median: 28.5,
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stdDeviation: 2.52,
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}
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expect(result).to.eql(expectedResult)
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})
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})
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describe('when args are wrong', () => {
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it('throws when arg object is an empty array', () => {
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const cycleLengths = []
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expect(() => cycleInfo(cycleLengths)).to.throw(Error)
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}),
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it('throws when arg object is not in right format', () => {
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const wrongObject = { hello: 'world' }
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expect(() => cycleInfo(wrongObject)).to.throw(Error)
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}),
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it('throws when arg array contains a string', () => {
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const wrongElement = [4, 1, 15, '2', 20, 5]
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expect(() => cycleInfo(wrongElement)).to.throw(Error)
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}),
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it('throws when arg array contains a NaN', () => {
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const wrongElement = [4, 1, 15, NaN, 20, 5]
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expect(() => cycleInfo(wrongElement)).to.throw(Error)
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})
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})
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})
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