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