bdd-lazy-var

Mocha BDD + lazy variable definition (aka rspec)

Provides "ui" for mocha.js which allows to define lazy variables and subjects.

Installation

npm install bdd-lazy-var --save-dev

Browser version: bdd-lazy-var.js.Node version: index.js.

How to use

Command line: mocha -ui bdd-lazy-var or in JavaScript:

var mocha = new Mocha({
  ui: 'bdd-lazy-var'
});

Features

• all variables are defined lazily, so order doesn't matter.
• subject accessor as alias for def('subject', ...) and get('subject')
• ability to redefine outer variable
• fallback to parent's variables
• fallback to parent's variable inside the same definition (i.e. subject inside subject definition will refer to parent's subejct)
• all variables are cleaned after each test

Examples

describe('Suite', function() {
  def('fullName', function() {
    return get('firstName') + '+' + get('lastName');
  });

  def('firstName', 'BDD');
  def('lastName', 'Lazy variable');

  it('computes variables', function() {
    expect(get('fullName')).to.equal('BDD+Lazy variable');
  });

  describe('Nested suite', function() {
    def('fullName', function() {
      return get('fullName') + '!'; // get parent's "fullName" variable
    });

    it('gets parent variable', function() {
      expect(get('fullName')).to.equal('BDD+Lazy variable!');
    });
  });

  describe('Another nested suite', function() {
    def('lastName', 'Rocks!');

    it('redefines parent variable', function() {
      expect(get('fullName')).to.equal('BDD+Rocks!');
    });
  });

  describe('with subject', function() {
    subject(function() {
      return {};
    });

    it('defines subject', function() {
      expect(subejct()).to.be.an('object');
    });
  });
});