validatorjs/spec/implicit-rule.js

if (typeof require !== 'undefined') {
  var Validator = require('../src/validator.js');
  var expect = require('chai').expect;
} else {
  var Validator = window.Validator;
  var expect = window.chai.expect;
}

describe('implicit rule tests', function() {

  it('should fail implicit rule even when undefined', function() {
    Validator.registerImplicit('null_or_number', function(val) {
      return (val && val.match(/^\d*$/)) || val === null;
    },':attribute must be a number or empty');

    var validator = new Validator({/* empty */},{value:'null_or_number'});
    expect(validator.passes()).to.be.false;
  });

  it('should pass implicit rule even when null', function() {
    Validator.registerImplicit('null_or_number', function(val) {
      return (val && val.match(/^\d*$/)) || val === null;
    },':attribute must be a number or empty');

    var validator = new Validator({value:null},{value:'null_or_number'});
    expect(validator.passes()).to.be.true;
  });

  it('should fail async implicit rule even when undefined', function(done) {
    Validator.registerAsyncImplicit('async_null',
      function(value, attribute, req, passes) {
        setTimeout(function() {
          if (value === null) {
            passes(true);
          }
          else{
            passes(false);
          }
        }, 50);
    }, ':attribute already taken');

    var validator = new Validator({ /* empty */}, { value: 'async_null' });
    validator.fails(done);
  });

  it('should pass async implicit rule even when null', function(done) {
    Validator.registerAsyncImplicit('async_null',
      function(value, attribute, req, passes) {
        setTimeout(function() {
          if (value === null) {
            passes(true);
          }
          else{
            passes(false);
          }
        }, 50);
    }, ':attribute already taken');

    var validator = new Validator({ value: null }, { value: 'async_null' });
    validator.passes(done);
  });
});