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var async = require('../lib');
var expect = require('chai').expect;
var assert = require('assert');
describe("waterfall", function () {
it('basics', function(done){
var call_order = [];
async.waterfall([
function(callback){
call_order.push('fn1');
setTimeout(function(){callback(null, 'one', 'two');}, 0);
},
function(arg1, arg2, callback){
call_order.push('fn2');
expect(arg1).to.equal('one');
expect(arg2).to.equal('two');
setTimeout(function(){callback(null, arg1, arg2, 'three');}, 25);
},
function(arg1, arg2, arg3, callback){
call_order.push('fn3');
expect(arg1).to.equal('one');
expect(arg2).to.equal('two');
expect(arg3).to.equal('three');
callback(null, 'four');
},
function(arg4, callback){
call_order.push('fn4');
expect(call_order).to.eql(['fn1','fn2','fn3','fn4']);
callback(null, 'test');
}
], function(err){
expect(err === null, err + " passed instead of 'null'");
done();
});
});
it('empty array', function(done){
async.waterfall([], function(err){
if (err) throw err;
done();
});
});
it('non-array', function(done){
async.waterfall({}, function(err){
expect(err.message).to.equal('First argument to waterfall must be an array of functions');
done();
});
});
it('no callback', function(done){
async.waterfall([
function(callback){callback();},
function(callback){callback(); done();}
]);
});
it('async', function(done){
var call_order = [];
async.waterfall([
function(callback){
call_order.push(1);
callback();
call_order.push(2);
},
function(callback){
call_order.push(3);
callback();
},
function(){
expect(call_order).to.eql([1,3]);
done();
}
]);
});
it('error', function(done){
async.waterfall([
function(callback){
callback('error');
},
function(callback){
assert(false, 'next function should not be called');
callback();
}
], function(err){
expect(err).to.equal('error');
done();
});
});
it('multiple callback calls', function(){
var arr = [
function(callback){
callback(null, 'one', 'two');
callback(null, 'one', 'two');
},
function(arg1, arg2, callback){
callback(null, arg1, arg2, 'three');
}
];
expect(function () {
async.waterfall(arr, function () {});
}).to.throw(/already called/);
});
it('multiple callback calls (trickier) @nodeonly', function(done){
// 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
setTimeout(checkErr, 0, err)
})
function checkErr(err) {
expect(err.message).to.match(/already called/);
done();
}
async.waterfall([
function(callback){
setTimeout(callback, 0, null, 'one', 'two');
setTimeout(callback, 2, null, 'one', 'two');
},
function(arg1, arg2, callback){
setTimeout(callback, 15, null, arg1, arg2, 'three');
}
], function () {
throw new Error('should not get here')
});
});
it('call in another context @nycinvalid @nodeonly', function(done) {
var vm = require('vm');
var sandbox = {
async: async,
done: done
};
var fn = "(" + (function () {
async.waterfall([function (callback) {
callback();
}], function (err) {
if (err) {
return done(err);
}
done();
});
}).toString() + "())";
vm.runInNewContext(fn, sandbox);
});
it('should not use unnecessary deferrals', function (done) {
var sameStack = true;
async.waterfall([
function (cb) { cb(null, 1); },
function (arg, cb) { cb(); }
], function() {
expect(sameStack).to.equal(true);
done();
});
sameStack = false;
});
});
|
