233 lines
7 KiB
JavaScript
233 lines
7 KiB
JavaScript
import {
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formatRelevantDigits,
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bytesToKiB,
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bytesToMiB,
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bytesToGiB,
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numberToHumanSize,
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numberToMetricPrefix,
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sum,
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isOdd,
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median,
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changeInPercent,
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formattedChangeInPercent,
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isNumeric,
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isPositiveInteger,
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} from '~/lib/utils/number_utils';
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describe('Number Utils', () => {
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describe('formatRelevantDigits', () => {
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it('returns an empty string when the number is NaN', () => {
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expect(formatRelevantDigits('fail')).toBe('');
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});
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it('returns 4 decimals when there is 4 plus digits to the left', () => {
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const formattedNumber = formatRelevantDigits('1000.1234567');
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const rightFromDecimal = formattedNumber.split('.')[1];
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const leftFromDecimal = formattedNumber.split('.')[0];
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expect(rightFromDecimal.length).toBe(4);
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expect(leftFromDecimal.length).toBe(4);
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});
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it('returns 3 decimals when there is 1 digit to the left', () => {
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const formattedNumber = formatRelevantDigits('0.1234567');
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const rightFromDecimal = formattedNumber.split('.')[1];
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const leftFromDecimal = formattedNumber.split('.')[0];
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expect(rightFromDecimal.length).toBe(3);
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expect(leftFromDecimal.length).toBe(1);
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});
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it('returns 2 decimals when there is 2 digits to the left', () => {
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const formattedNumber = formatRelevantDigits('10.1234567');
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const rightFromDecimal = formattedNumber.split('.')[1];
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const leftFromDecimal = formattedNumber.split('.')[0];
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expect(rightFromDecimal.length).toBe(2);
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expect(leftFromDecimal.length).toBe(2);
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});
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it('returns 1 decimal when there is 3 digits to the left', () => {
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const formattedNumber = formatRelevantDigits('100.1234567');
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const rightFromDecimal = formattedNumber.split('.')[1];
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const leftFromDecimal = formattedNumber.split('.')[0];
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expect(rightFromDecimal.length).toBe(1);
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expect(leftFromDecimal.length).toBe(3);
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});
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});
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describe('bytesToKiB', () => {
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it('calculates KiB for the given bytes', () => {
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expect(bytesToKiB(1024)).toEqual(1);
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expect(bytesToKiB(1000)).toEqual(0.9765625);
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});
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});
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describe('bytesToMiB', () => {
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it('calculates MiB for the given bytes', () => {
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expect(bytesToMiB(1048576)).toEqual(1);
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expect(bytesToMiB(1000000)).toEqual(0.95367431640625);
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});
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});
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describe('bytesToGiB', () => {
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it('calculates GiB for the given bytes', () => {
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expect(bytesToGiB(1073741824)).toEqual(1);
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expect(bytesToGiB(10737418240)).toEqual(10);
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});
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});
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describe('numberToHumanSize', () => {
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it('should return bytes', () => {
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expect(numberToHumanSize(654)).toEqual('654 bytes');
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expect(numberToHumanSize(-654)).toEqual('-654 bytes');
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});
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it('should return KiB', () => {
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expect(numberToHumanSize(1079)).toEqual('1.05 KiB');
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expect(numberToHumanSize(-1079)).toEqual('-1.05 KiB');
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});
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it('should return MiB', () => {
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expect(numberToHumanSize(10485764)).toEqual('10.00 MiB');
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expect(numberToHumanSize(-10485764)).toEqual('-10.00 MiB');
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});
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it('should return GiB', () => {
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expect(numberToHumanSize(10737418240)).toEqual('10.00 GiB');
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expect(numberToHumanSize(-10737418240)).toEqual('-10.00 GiB');
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});
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});
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describe('numberToMetricPrefix', () => {
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it.each`
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number | expected
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${123} | ${'123'}
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${1234} | ${'1.2k'}
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${12345} | ${'12.3k'}
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${123456} | ${'123.5k'}
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${1234567} | ${'1.2m'}
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${12345678} | ${'12.3m'}
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${123456789} | ${'123.5m'}
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`('returns $expected given $number', ({ number, expected }) => {
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expect(numberToMetricPrefix(number)).toBe(expected);
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});
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});
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describe('sum', () => {
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it('should add up two values', () => {
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expect(sum(1, 2)).toEqual(3);
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});
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it('should add up all the values in an array when passed to a reducer', () => {
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expect([1, 2, 3, 4, 5].reduce(sum)).toEqual(15);
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});
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});
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describe('isOdd', () => {
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it('should return 0 with a even number', () => {
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expect(isOdd(2)).toEqual(0);
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});
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it('should return 1 with a odd number', () => {
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expect(isOdd(1)).toEqual(1);
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});
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});
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describe('median', () => {
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it('computes the median for a given array with odd length', () => {
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const items = [10, 27, 20, 5, 19];
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expect(median(items)).toBe(19);
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});
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it('computes the median for a given array with even length', () => {
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const items = [10, 27, 20, 5, 19, 4];
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expect(median(items)).toBe(14.5);
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});
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});
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describe('changeInPercent', () => {
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it.each`
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firstValue | secondValue | expectedOutput
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${99} | ${100} | ${1}
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${100} | ${99} | ${-1}
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${0} | ${99} | ${Infinity}
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${2} | ${2} | ${0}
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${-100} | ${-99} | ${1}
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`(
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'computes the change between $firstValue and $secondValue in percent',
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({ firstValue, secondValue, expectedOutput }) => {
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expect(changeInPercent(firstValue, secondValue)).toBe(expectedOutput);
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},
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);
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});
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describe('formattedChangeInPercent', () => {
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it('prepends "%" to the output', () => {
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expect(formattedChangeInPercent(1, 2)).toMatch(/%$/);
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});
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it('indicates if the change was a decrease', () => {
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expect(formattedChangeInPercent(100, 99)).toContain('-1');
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});
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it('indicates if the change was an increase', () => {
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expect(formattedChangeInPercent(99, 100)).toContain('+1');
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});
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it('shows "-" per default if the change can not be expressed in an integer', () => {
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expect(formattedChangeInPercent(0, 1)).toBe('-');
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});
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it('shows the given fallback if the change can not be expressed in an integer', () => {
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expect(formattedChangeInPercent(0, 1, { nonFiniteResult: '*' })).toBe('*');
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});
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});
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describe('isNumeric', () => {
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it.each`
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value | outcome
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${0} | ${true}
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${12345} | ${true}
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${'0'} | ${true}
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${'12345'} | ${true}
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${1.0} | ${true}
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${'1.0'} | ${true}
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${'abcd'} | ${false}
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${'abcd100'} | ${false}
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${''} | ${false}
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${false} | ${false}
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${true} | ${false}
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${undefined} | ${false}
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${null} | ${false}
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`('when called with $value it returns $outcome', ({ value, outcome }) => {
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expect(isNumeric(value)).toBe(outcome);
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});
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});
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describe.each`
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value | outcome
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${0} | ${true}
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${'0'} | ${true}
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${12345} | ${true}
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${'12345'} | ${true}
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${-1} | ${false}
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${'-1'} | ${false}
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${1.01} | ${false}
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${'1.01'} | ${false}
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${'abcd'} | ${false}
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${'100abcd'} | ${false}
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${'abcd100'} | ${false}
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${''} | ${false}
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${false} | ${false}
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${true} | ${false}
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${undefined} | ${false}
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${null} | ${false}
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${Infinity} | ${false}
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`('isPositiveInteger', ({ value, outcome }) => {
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it(`when called with ${typeof value} ${value} it returns ${outcome}`, () => {
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expect(isPositiveInteger(value)).toBe(outcome);
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});
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});
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});
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