15 lines
499 B
JavaScript
15 lines
499 B
JavaScript
const expect = require('expect');
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const lowercaseKeys = require('./lowercaseKeys.js');
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test('lowercaseKeys is a Function', () => {
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expect(lowercaseKeys).toBeInstanceOf(Function);
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});
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const myObj = { Name: 'Adam', sUrnAME: 'Smith' };
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const myObjLower = lowercaseKeys(myObj);
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test('Lowercases object keys', () => {
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expect(myObjLower).toEqual({ name: 'Adam', surname: 'Smith' });
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});
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test('Does not mutate original object', () => {
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expect(myObj).toEqual({ Name: 'Adam', sUrnAME: 'Smith' });
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});
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