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var async = require('../lib');
var expect = require('chai').expect;
var assert = require('assert');
describe("memoize", function() {
it('memoize', function(done) {
var call_order = [];
var fn = function (arg1, arg2, callback) {
async.setImmediate(function () {
call_order.push(['fn', arg1, arg2]);
callback(null, arg1 + arg2);
});
};
var fn2 = async.memoize(fn);
fn2(1, 2, function (err, result) {
assert(err === null, err + " passed instead of 'null'");
expect(result).to.equal(3);
fn2(1, 2, function (err, result) {
expect(result).to.equal(3);
fn2(2, 2, function (err, result) {
expect(result).to.equal(4);
expect(call_order).to.eql([['fn',1,2], ['fn',2,2]]);
done();
});
});
});
});
it('maintains asynchrony', function(done) {
var call_order = [];
var fn = function (arg1, arg2, callback) {
call_order.push(['fn', arg1, arg2]);
async.setImmediate(function () {
call_order.push(['cb', arg1, arg2]);
callback(null, arg1 + arg2);
});
};
var fn2 = async.memoize(fn);
fn2(1, 2, function (err, result) {
expect(result).to.equal(3);
fn2(1, 2, function (err, result) {
expect(result).to.equal(3);
async.nextTick(memoize_done);
call_order.push('tick3');
});
call_order.push('tick2');
});
call_order.push('tick1');
function memoize_done() {
var async_call_order = [
['fn',1,2], // initial async call
'tick1', // async caller
['cb',1,2], // async callback
// ['fn',1,2], // memoized // memoized async body
'tick2', // handler for first async call
// ['cb',1,2], // memoized // memoized async response body
'tick3' // handler for memoized async call
];
expect(call_order).to.eql(async_call_order);
done();
}
});
it('unmemoize', function(done) {
var call_order = [];
var fn = function (arg1, arg2, callback) {
call_order.push(['fn', arg1, arg2]);
async.setImmediate(function () {
callback(null, arg1 + arg2);
});
};
var fn2 = async.memoize(fn);
var fn3 = async.unmemoize(fn2);
fn3(1, 2, function (err, result) {
expect(result).to.equal(3);
fn3(1, 2, function (err, result) {
expect(result).to.equal(3);
fn3(2, 2, function (err, result) {
expect(result).to.equal(4);
expect(call_order).to.eql([['fn',1,2], ['fn',1,2], ['fn',2,2]]);
done();
});
});
});
});
it('unmemoize a not memoized function', function(done) {
var fn = function (arg1, arg2, callback) {
callback(null, arg1 + arg2);
};
var fn2 = async.unmemoize(fn);
fn2(1, 2, function(err, result) {
expect(result).to.equal(3);
});
done();
});
it('error', function(done) {
var testerr = new Error('test');
var fn = function (arg1, arg2, callback) {
callback(testerr, arg1 + arg2);
};
async.memoize(fn)(1, 2, function (err) {
expect(err).to.equal(testerr);
});
done();
});
it('multiple calls', function(done) {
var fn = function (arg1, arg2, callback) {
assert(true);
setTimeout(function(){
callback(null, arg1, arg2);
}, 10);
};
var fn2 = async.memoize(fn);
fn2(1, 2, function(err, result) {
expect(result).to.equal(1, 2);
});
fn2(1, 2, function(err, result) {
expect(result).to.equal(1, 2);
done();
});
});
it('custom hash function', function(done) {
var testerr = new Error('test');
var fn = function (arg1, arg2, callback) {
callback(testerr, arg1 + arg2);
};
var fn2 = async.memoize(fn, function () {
return 'custom hash';
});
fn2(1, 2, function (err, result) {
expect(result).to.equal(3);
fn2(2, 2, function (err, result) {
expect(result).to.equal(3);
done();
});
});
});
it('manually added memo value', function(done) {
var fn = async.memoize(function() {
throw new Error("Function should never be called");
});
fn.memo.foo = ["bar"];
fn("foo", function(val) {
expect(val).to.equal("bar");
done();
});
});
it('avoid constructor key return undefined', function(done) {
var fn = async.memoize(function(name, callback) {
setTimeout(function(){
callback(null, name);
}, 100);
});
fn('constructor', function(error, results) {
expect(results).to.equal('constructor');
done();
});
});
it('avoid __proto__ key return undefined', function(done) {
// Skip test if there is a Object.create bug (node 0.10 and some Chrome 30x versions)
var x = Object.create(null);
/* jshint proto: true */
x.__proto__ = 'foo';
if (x.__proto__ !== 'foo') {
return done();
}
var fn = async.memoize(function(name, callback) {
setTimeout(function(){
callback(null, name);
}, 100);
});
fn('__proto__', function(error, results) {
expect(results).to.equal('__proto__');
done();
});
});
it('allow hasOwnProperty as key', function(done) {
var fn = async.memoize(function(name, callback) {
setTimeout(function(){
callback(null, name);
}, 100);
});
fn('hasOwnProperty', function(error, results) {
expect(results).to.equal('hasOwnProperty');
done();
});
});
});
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