text: const maxUsedChar = require('./maxUsedChar');
  
  test('maxUsedChar function exists', () => {
    expect(typeof maxUsedChar).toEqual('function');
  });
  
  test('Finds the most frequently used char', () => {
    expect(maxUsedChar('a')).toEqual('a');
    expect(maxUsedChar('abcdefghijklmnaaaaa')).toEqual('a');
  });
  
  test('Works with numbers in the string', () => {
    expect(maxUsedChar('ab1c1d1e1f1g1')).toEqual('1');
  });
  
  test('Expect implementation not to be case sensitive', () => {
    expect(maxUsedChar('a')).toEqual('a');
    expect(maxUsedChar('bbbcdefaaAA')).toEqual('a');
  });
  