36 lines
1.0 KiB
JavaScript
36 lines
1.0 KiB
JavaScript
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const { padWithLeadingZeros } = require('./pad-with-leading-zeros');
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describe('padWithLeadingZeros helper', () => {
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it('should return a string of 3 digits for valid values', () => {
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const items = ['1', '11', '111'];
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items.forEach(item => expect(padWithLeadingZeros(item).length).toEqual(3));
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});
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it('should prepend 0s on valid values while length is less than 3', () => {
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expect(padWithLeadingZeros('1')).toEqual('001');
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expect(padWithLeadingZeros('11')).toEqual('011');
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expect(padWithLeadingZeros('111')).toEqual('111');
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});
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it('should throw on invalid values', () => {
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const items = ['undefined', null, []];
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items.forEach(item =>
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expect(() => {
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if (item !== 'undefined') {
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padWithLeadingZeros(item);
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} else {
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padWithLeadingZeros();
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}
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}).toThrow()
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);
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});
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it('should throw on valid values that are longer that 3 characters', () => {
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expect(() => {
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padWithLeadingZeros('19850809');
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}).toThrow();
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});
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});
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