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var async = require('../lib');
var expect = require('chai').expect;
var assert = require('assert');
describe("map", function() {
function mapIteratee(call_order, x, callback) {
setTimeout(function() {
call_order.push(x);
callback(null, x * 2);
}, x * 25);
}
it('basic', function(done) {
var call_order = [];
async.map([1, 3, 2], mapIteratee.bind(this, call_order), function(err, results) {
assert(err === null, err + " passed instead of 'null'");
expect(call_order).to.eql([1, 2, 3]);
expect(results).to.eql([2, 6, 4]);
done();
});
});
it('with reflect', function(done) {
var call_order = [];
async.map([1, 3, 2], async.reflect(function(item, cb) {
setTimeout(function() {
call_order.push(item);
cb(null, item * 2);
}, item * 25);
}), function(err, results) {
assert(err === null, err + " passed instead of 'null'");
expect(call_order).to.eql([1, 2, 3]);
expect(results).to.eql([{
value: 2
}, {
value: 6
}, {
value: 4
}]);
done();
});
});
it('error with reflect', function(done) {
var call_order = [];
async.map([-1, 1, 3, 2], async.reflect(function(item, cb) {
setTimeout(function() {
call_order.push(item);
if (item < 0) {
cb('number less then zero');
} else {
cb(null, item * 2);
}
}, item * 25);
}), function(err, results) {
assert(err === null, err + " passed instead of 'null'");
expect(call_order).to.eql([-1, 1, 2, 3]);
expect(results).to.eql([{
error: 'number less then zero'
}, {
value: 2
}, {
value: 6
}, {
value: 4
}]);
done();
});
});
it('map original untouched', function(done) {
var a = [1, 2, 3];
async.map(a, function(x, callback) {
callback(null, x * 2);
}, function(err, results) {
expect(results).to.eql([2, 4, 6]);
expect(a).to.eql([1, 2, 3]);
done();
});
});
it('map without main callback', function(done) {
var a = [1, 2, 3];
var r = [];
async.map(a, function(x, callback) {
r.push(x);
var done_ = r.length == a.length;
callback(null);
if (done_) {
expect(r).to.eql(a);
done();
}
});
});
it('map error', function(done) {
async.map([1, 2, 3], function(x, callback) {
callback('error');
}, function(err) {
expect(err).to.equal('error');
});
setTimeout(done, 50);
});
it('map undefined array', function(done) {
async.map(undefined, function(x, callback) {
callback();
}, function(err, result) {
expect(err).to.equal(null);
expect(result).to.eql([]);
});
setTimeout(done, 50);
});
it('map object', function(done) {
async.map({
a: 1,
b: 2,
c: 3
}, function(val, callback) {
callback(null, val * 2);
}, function(err, result) {
if (err) throw err;
expect(Object.prototype.toString.call(result)).to.equal('[object Array]');
expect(result).to.contain(2);
expect(result).to.contain(4);
expect(result).to.contain(6);
done();
});
});
it('mapSeries', function(done) {
var call_order = [];
async.mapSeries([1, 3, 2], mapIteratee.bind(this, call_order), function(err, results) {
assert(err === null, err + " passed instead of 'null'");
expect(call_order).to.eql([1, 3, 2]);
expect(results).to.eql([2, 6, 4]);
done();
});
});
it('mapSeries error', function(done) {
async.mapSeries([1, 2, 3], function(x, callback) {
callback('error');
}, function(err) {
expect(err).to.equal('error');
});
setTimeout(done, 50);
});
it('mapSeries undefined array', function(done) {
async.mapSeries(undefined, function(x, callback) {
callback();
}, function(err, result) {
expect(err).to.equal(null);
expect(result).to.eql([]);
});
setTimeout(done, 50);
});
it('mapSeries object', function(done) {
async.mapSeries({
a: 1,
b: 2,
c: 3
}, function(val, callback) {
callback(null, val * 2);
}, function(err, result) {
if (err) throw err;
expect(result).to.contain(2);
expect(result).to.contain(4);
expect(result).to.contain(6);
done();
});
});
it('mapLimit', function(done) {
var call_order = [];
async.mapLimit([2, 4, 3], 2, mapIteratee.bind(this, call_order), function(err, results) {
assert(err === null, err + " passed instead of 'null'");
expect(call_order).to.eql([2, 4, 3]);
expect(results).to.eql([4, 8, 6]);
done();
});
});
it('mapLimit empty array', function(done) {
async.mapLimit([], 2, function(x, callback) {
assert(false, 'iteratee should not be called');
callback();
}, function(err) {
if (err) throw err;
assert(true, 'should call callback');
});
setTimeout(done, 25);
});
it('mapLimit undefined array', function(done) {
async.mapLimit(undefined, 2, function(x, callback) {
callback();
}, function(err, result) {
expect(err).to.equal(null);
expect(result).to.eql([]);
});
setTimeout(done, 50);
});
it('mapLimit limit exceeds size', function(done) {
var call_order = [];
async.mapLimit([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 20, mapIteratee.bind(this, call_order), function(err, results) {
expect(call_order).to.eql([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
expect(results).to.eql([0, 2, 4, 6, 8, 10, 12, 14, 16, 18]);
done();
});
});
it('mapLimit limit equal size', function(done) {
var call_order = [];
async.mapLimit([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 10, mapIteratee.bind(this, call_order), function(err, results) {
expect(call_order).to.eql([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
expect(results).to.eql([0, 2, 4, 6, 8, 10, 12, 14, 16, 18]);
done();
});
});
it('mapLimit zero limit', function(done) {
async.mapLimit([0, 1, 2, 3, 4, 5], 0, function(x, callback) {
assert(false, 'iteratee should not be called');
callback();
}, function(err, results) {
expect(results).to.eql([]);
assert(true, 'should call callback');
});
setTimeout(done, 25);
});
it('mapLimit error', function(done) {
var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
var call_order = [];
async.mapLimit(arr, 3, function(x, callback) {
call_order.push(x);
if (x === 2) {
callback('error');
}
}, function(err) {
expect(call_order).to.eql([0, 1, 2]);
expect(err).to.equal('error');
});
setTimeout(done, 25);
});
it('mapLimit does not continue replenishing after error', function(done) {
var started = 0;
var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
var delay = 10;
var limit = 3;
var maxTime = 10 * arr.length;
async.mapLimit(arr, limit, function(x, callback) {
started++;
if (started === 3) {
return callback(new Error("Test Error"));
}
setTimeout(function() {
callback();
}, delay);
}, function() {});
setTimeout(function() {
expect(started).to.equal(3);
done();
}, maxTime);
});
it('map with Map', function(done) {
if (typeof Map !== 'function')
return done();
var map = new Map();
map.set(1, "a");
map.set(2, "b");
async.map(map, function(val, cb) {
cb(null, val);
}, function(err, result) {
assert(Array.isArray(result), "map should return an array for an iterable");
done();
});
});
// Issue 1106 on github: https://github.com/caolan/async/issues/1106
it('map main callback is called only once', function(done) {
async.map([1, 2], function(item, callback) {
try {
callback(item);
} catch (exception) {
expect(function() {
callback(exception);
}).to.throw(/already called/);
done();
}
}, function(err) {
no_such_function();
});
});
});
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