TheAlgorithmJavaScript/String/test/Upper.test.js at master · dtphi/TheAlgorithmJavaScript · GitHub

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import upper from '../Upper'
describe('Testing the Upper function', () => {
  it('return uppercase strings', () => {
    expect(upper('hello')).toBe('HELLO')
    expect(upper('WORLD')).toBe('WORLD')
    expect(upper('hello_WORLD')).toBe('HELLO_WORLD')