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var async = require('../lib');
var assert = require('assert');
var expect = require('chai').expect;
describe('asyncify', function(){
it('asyncify', function(done) {
var parse = async.asyncify(JSON.parse);
parse("{\"a\":1}", function (err, result) {
assert(!err);
expect(result.a).to.equal(1);
done();
});
});
it('asyncify null', function(done) {
var parse = async.asyncify(function() {
return null;
});
parse("{\"a\":1}", function (err, result) {
assert(!err);
expect(result).to.equal(null);
done();
});
});
it('variable numbers of arguments', function(done) {
async.asyncify(function (/*x, y, z*/) {
return arguments;
})(1, 2, 3, function (err, result) {
expect(result.length).to.equal(3);
expect(result[0]).to.equal(1);
expect(result[1]).to.equal(2);
expect(result[2]).to.equal(3);
done();
});
});
it('catch errors', function(done) {
async.asyncify(function () {
throw new Error("foo");
})(function (err) {
assert(err);
expect(err.message).to.equal("foo");
done();
});
});
it('dont catch errors in the callback', function(done) {
try {
async.asyncify(function () {})(function (err) {
if (err) {
return done(new Error("should not get an error here"));
}
throw new Error("callback error");
});
} catch (err) {
expect(err.message).to.equal("callback error");
done();
}
});
describe('promisified', function() {
function promisifiedTests(Promise) {
it('resolve', function(done) {
var promisified = function(argument) {
return new Promise(function (resolve) {
setTimeout(function () {
resolve(argument + " resolved");
}, 15);
});
};
async.asyncify(promisified)("argument", function (err, value) {
if (err) {
return done(new Error("should not get an error here"));
}
expect(value).to.equal("argument resolved");
done();
});
});
it('reject', function(done) {
var promisified = function(argument) {
return new Promise(function (resolve, reject) {
reject(argument + " rejected");
});
};
async.asyncify(promisified)("argument", function (err) {
assert(err);
expect(err.message).to.equal("argument rejected");
done();
});
});
it('callback error @nodeonly', function(done) {
expectUncaughtException();
var promisified = function(argument) {
return new Promise(function (resolve) {
resolve(argument + " resolved");
});
};
var call_count = 0;
async.asyncify(promisified)("argument", function () {
call_count++;
if (call_count === 1) {
throw new Error("error in callback");
}
});
setTimeout(function () {
expect(call_count).to.equal(1);
done();
}, 15);
});
it('dont catch errors in the callback @nodeonly', function(done) {
expectUncaughtException(checkErr);
var callbackError = new Error('thrown from callback');
function checkErr(err) {
expect(err).to.equal(callbackError);
done();
}
function callback() {
throw callbackError;
}
async.asyncify(function () {
return Promise.reject(new Error('rejection'));
})(callback);
});
}
describe('native-promise-only', function() {
var Promise = require('native-promise-only');
promisifiedTests.call(this, Promise);
});
describe('bluebird', function() {
var Promise = require('bluebird');
// Bluebird reports unhandled rejections to stderr. We handle it because we expect
// unhandled rejections:
Promise.onPossiblyUnhandledRejection(function ignoreRejections() {});
promisifiedTests.call(this, Promise);
});
describe('es6-promise', function() {
var Promise = require('es6-promise').Promise;
promisifiedTests.call(this, Promise);
});
describe('rsvp', function() {
var Promise = require('rsvp').Promise;
promisifiedTests.call(this, Promise);
});
function expectUncaughtException(onError) {
// do a weird dance to catch the async thrown error before mocha
var listeners = process.listeners('uncaughtException');
process.removeAllListeners('uncaughtException');
process.once('uncaughtException', function onErr(err) {
listeners.forEach(function(listener) {
process.on('uncaughtException', listener);
});
// can't throw errors in a uncaughtException handler, defer
if (onError) {
setTimeout(onError, 0, err);
}
});
}
});
});
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