typo-check__tests.js

const testInputs = [
  // correct
  {firstName: '', lastName: '', email: '[email protected]', expectedResult: ''},
  {firstName: 'yo', lastName: 'shortname', email: '[email protected]', expectedResult: ''},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: ''},
  {firstName: 'david', lastName: 'gilbertson', email: 'david.gilbertson@SOME+THING-ODD!!.com', expectedResult: ''},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: ''},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: ''},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: ''},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: ''},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: ''},

  // common mistakes
  {firstName: 'a', lastName: 'b', email: 'a.b@example,com', expectedResult: '[email protected]'},
  {firstName: 'a', lastName: 'b', email: 'a.b@example,co.de', expectedResult: '[email protected]'},
  {firstName: 'a', lastName: 'b', email: 'a.b@noDotCom', expectedResult: '[email protected]'},

  // domain typo
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},

  // name typo
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
  {firstName: 'david', lastName: 'gilbertson', email: '[email protected]', expectedResult: '[email protected]'},
];

testInputs.forEach(testInput => {
  console.assert(
    testInput.expectedResult === checkForTypo(testInput),
    `${testInput.email} was not given the suggestion: ${testInput.expectedResult}`
  );
});