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var async = require('../lib');
var assert = require('assert');
describe('race', function () {
it('should call each function in parallel and callback with first result', function raceTest10(done) {
var finished = 0;
var tasks = [];
function eachTest(i) {
var index = i;
return function (next) {
finished++;
next(null, index);
};
}
for (var i = 0; i < 10; i++) {
tasks[i] = eachTest(i);
}
async.race(tasks, function (err, result) {
assert.ifError(err);
//0 finished first
assert.strictEqual(result, 0);
assert.strictEqual(finished, 1);
async.setImmediate(function () {
assert.strictEqual(finished, 10);
done();
});
});
});
it('should callback with the first error', function raceTest20(done) {
var tasks = [];
function eachTest(i) {
var index = i;
return function (next) {
setTimeout(function () {
next(new Error('ERR' + index));
}, 50 - index * 2);
};
}
for (var i = 0; i <= 5; i++) {
tasks[i] = eachTest(i);
}
async.race(tasks, function (err, result) {
assert.ok(err);
assert.ok(err instanceof Error);
assert.strictEqual(typeof result, 'undefined');
assert.strictEqual(err.message, 'ERR5');
done();
});
});
it('should callback when task is empty', function raceTest30(done) {
async.race([], function (err, result) {
assert.ifError(err);
assert.strictEqual(typeof result, 'undefined');
done();
});
});
it('should callback in error the task arg is not an Array', function raceTest40() {
var errors = [];
async.race(null, function (err) {
errors.push(err);
});
async.race({}, function (err) {
errors.push(err);
});
assert.strictEqual(errors.length, 2);
assert.ok(errors[0] instanceof TypeError);
assert.ok(errors[1] instanceof TypeError);
});
});
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