unitTest.js

var assert = require('assert');
 
function validateEmail(email) {
  var regex = /.*@.*\..*/;
  if (email.match(regex) !== null) {
    return true;
  } else {
    return false;
  }
}
 
describe('Email Validation', function() {
  describe('Types', function() {
    it('should be a function', function() {
      assert.equal(typeof validateEmail, 'function');
    });
    it('should return a boolean', function() {
      assert.equal(validateEmail('test', 'boolean'));
    });
  });
  describe('Valid', function() {
    var emails = ['[email protected]', '[email protected]'];
    emails.forEach(function(email) {
      it('should return true', function() {
        assert.equal(validateEmail(email), true);
      });
    });
  });

  describe('Invalid', function() {
    var emails = ['danlol.com', 'ed/haha.com'];
    emails.forEach(function(email) {
      it('should return false', function() {
        assert.equal(validateEmail(email), false);
      });
    });
  });
});