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alien-node-q-utils

v1.0.3

Published

Helper functions for promises with Q on NodeJS

Downloads

858

Readme

alien-node-q-utils

Helper functions for promises with Q on NodeJS. The functions are pure and curried with Ramda.

Build Status Coverage Status npm version Dependency Status

Install

$ npm install alien-node-q-utils --save

Run the specs

$ npm test

Methods

rejectedPromise

A pre-rejected promise that throws the rejection into an expected catch block.

  it('should pre-reject a promise', function(done) {
    rejectedPromise('foo')
      .catch(function(err) {
        expect(err).toBe('foo');
        done();
      })
  });

resolvedPromise

A pre-resolved promise that passes the resolution into the expected then block.

  it('should pre-resolve a promise', function(done) {
    resolvedPromise('foo')
      .then(function(data) {
        expect(data).toBe('foo');
        done();
      })
  });

rejectOnErrorOrResolve

Given a function signature of fn(deferred, err, data) this will reject deferred if err is provided, otherwise resolve deferred with data.

  • Don't forget this function is curried, so the arity must be recognized. (If you omit the data param, you will get a function that accepts only the data param.)

  var mockPromiseNoError = function(resolveWith) {
    var deferred = Q.defer();
    rejectOnErrorOrResolve(deferred, undefined, resolveWith);
    return deferred.promise;
  };
  
  var mockPromiseWithError = function(err) {
    var deferred = Q.defer();
    rejectOnErrorOrResolve(deferred, err, undefined);
    return deferred.promise;
  };

  it('should resolve if no error is provided', function(done) {
    var deferred = Q.defer();
    mockPromiseNoError('foo')
      .then(function(data) {
        expect(data).toBe('foo');
        done();
      });
  });
  
  it('should reject if error is provided', function(done) {
    var deferred = Q.defer();
    mockPromiseWithError('foo')
      .catch(function(err) {
        expect(err).toBe('foo');
        done();
      });
  });

TODO

  • Need specs and descriptions for new mapP methods