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var async = require('../lib');
var assert = require('assert');
var expect = require('chai').expect;
describe('asyncify', () => {
it('asyncify', (done) => {
var parse = async.asyncify(JSON.parse);
parse("{\"a\":1}", (err, result) => {
assert(!err);
expect(result.a).to.equal(1);
done();
});
});
it('asyncify null', (done) => {
var parse = async.asyncify(() => {
return null;
});
parse("{\"a\":1}", (err, result) => {
assert(!err);
expect(result).to.equal(null);
done();
});
});
it('variable numbers of arguments', (done) => {
const fn = (...args/*x, y, z*/) => args
async.asyncify(fn)(1, 2, 3, (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', (done) => {
async.asyncify(() => {
throw new Error("foo");
})((err) => {
assert(err);
expect(err.message).to.equal("foo");
done();
});
});
it('dont catch errors in the callback', (done) => {
try {
async.asyncify(() => {})((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 promisifiedTests(Promise) {
it('resolve', (done) => {
var promisified = function(argument) {
return new Promise(((resolve) => {
setTimeout(() => {
resolve(argument + " resolved");
}, 15);
}));
};
async.asyncify(promisified)("argument", (err, value) => {
if (err) {
return done(new Error("should not get an error here"));
}
expect(value).to.equal("argument resolved");
done();
});
});
it('reject', (done) => {
var promisified = function(argument) {
return new Promise(((resolve, reject) => {
reject(argument + " rejected");
}));
};
async.asyncify(promisified)("argument", (err) => {
assert(err);
expect(err.message).to.equal("argument rejected");
done();
});
});
it('callback error @nodeonly', (done) => {
expectUncaughtException();
var promisified = function(argument) {
return new Promise(((resolve) => {
resolve(argument + " resolved");
}));
};
var call_count = 0;
async.asyncify(promisified)("argument", () => {
call_count++;
if (call_count === 1) {
throw new Error("error in callback");
}
});
setTimeout(() => {
expect(call_count).to.equal(1);
done();
}, 15);
});
it('dont catch errors in the callback @nodeonly', (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(() => {
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(() => {});
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', (err) => {
listeners.forEach((listener) => {
process.on('uncaughtException', listener);
});
// can't throw errors in a uncaughtException handler, defer
if (onError) {
setTimeout(onError, 0, err);
}
});
}
});
});
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