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var async = require('../lib');
var expect = require('chai').expect;
var assert = require('assert');
var _ = require('lodash');
describe("retry", function () {
// Issue 306 on github: https://github.com/caolan/async/issues/306
it('retry when attempt succeeds',function(done) {
var failed = 3;
var callCount = 0;
var expectedResult = 'success';
function fn(callback) {
callCount++;
failed--;
if (!failed) callback(null, expectedResult);
else callback(true); // respond with error
}
async.retry(fn, function(err, result){
assert(err === null, err + " passed instead of 'null'");
assert.equal(callCount, 3, 'did not retry the correct number of times');
assert.equal(result, expectedResult, 'did not return the expected result');
done();
});
});
it('retry when all attempts fail',function(done) {
var times = 3;
var callCount = 0;
var error = 'ERROR';
var erroredResult = 'RESULT';
function fn(callback) {
callCount++;
callback(error + callCount, erroredResult + callCount); // respond with indexed values
}
async.retry(times, fn, function(err, result){
assert.equal(callCount, 3, "did not retry the correct number of times");
assert.equal(err, error + times, "Incorrect error was returned");
assert.equal(result, erroredResult + times, "Incorrect result was returned");
done();
});
});
it('retry fails with invalid arguments',function(done) {
expect(function() {
async.retry("");
}).to.throw();
expect(function() {
async.retry();
}).to.throw();
expect(function() {
async.retry(function() {}, 2, function() {});
}).to.throw();
done();
});
it('retry with interval when all attempts fail',function(done) {
this.retries(3); // this test is flakey due to timing issues
var times = 3;
var interval = 50;
var callCount = 0;
var error = 'ERROR';
var erroredResult = 'RESULT';
function fn(callback) {
callCount++;
callback(error + callCount, erroredResult + callCount); // respond with indexed values
}
var start = new Date().getTime();
async.retry({ times: times, interval: interval}, fn, function(err, result){
var now = new Date().getTime();
var duration = now - start;
assert(duration >= (interval * (times -1)), 'did not include interval');
assert.equal(callCount, 3, "did not retry the correct number of times");
assert.equal(err, error + times, "Incorrect error was returned");
assert.equal(result, erroredResult + times, "Incorrect result was returned");
done();
});
});
it('retry with custom interval when all attempts fail',function(done) {
var times = 3;
var intervalFunc = function(retryCount) { return retryCount * 100; };
var callCount = 0;
var error = 'ERROR';
var erroredResult = 'RESULT';
function fn(callback) {
callCount++;
callback(error + callCount, erroredResult + callCount); // respond with indexed values
}
var start = new Date().getTime();
async.retry({ times: times, interval: intervalFunc}, fn, function(err, result){
var now = new Date().getTime();
var duration = now - start;
assert(duration >= 300, 'did not include custom interval');
assert.equal(callCount, 3, "did not retry the correct number of times");
assert.equal(err, error + times, "Incorrect error was returned");
assert.equal(result, erroredResult + times, "Incorrect result was returned");
done();
});
});
it("should not require a callback", function (done) {
var called = false;
async.retry(3, function(cb) {
called = true;
cb();
});
setTimeout(function () {
assert(called);
done();
}, 10);
});
it("should not require a callback and use the default times", function (done) {
var calls = 0;
async.retry(function(cb) {
calls++;
cb("fail");
});
setTimeout(function () {
expect(calls).to.equal(5);
done();
}, 50);
});
it('retry does not precompute the intervals (#1226)', function(done) {
var callTimes = [];
function intervalFunc() {
callTimes.push(new Date().getTime());
return 100;
};
function fn(callback) {
callback({}); // respond with indexed values
}
async.retry({ times: 4, interval: intervalFunc}, fn, function(){
expect(callTimes[1] - callTimes[0]).to.be.above(90);
expect(callTimes[2] - callTimes[1]).to.be.above(90);
done();
});
});
it('retry passes all resolve arguments to callback', function(done) {
function fn(callback) {
callback(null, 1, 2, 3); // respond with indexed values
}
async.retry(5, fn, _.rest(function(args) {
expect(args).to.be.eql([null, 1, 2, 3]);
done();
}));
});
// note this is a synchronous test ensuring retry is synchrnous in the fastest (most straightforward) case
it('retry calls fn immediately and will call callback if successful', function() {
function fn(callback) {
callback(null, {a: 1});
}
async.retry(5, fn, function(err, result) {
expect(result).to.be.eql({a: 1});
});
});
it('retry when all attempts fail and error continue test returns true',function(done) {
var times = 3;
var callCount = 0;
var error = 'ERROR';
var special = 'SPECIAL_ERROR';
var erroredResult = 'RESULT';
function fn(callback) {
callCount++;
callback(error + callCount, erroredResult + callCount);
}
function errorTest(err) {
return err && err !== special;
}
var options = {
times: times,
errorFilter: errorTest
};
async.retry(options, fn, function(err, result){
assert.equal(callCount, 3, "did not retry the correct number of times");
assert.equal(err, error + times, "Incorrect error was returned");
assert.equal(result, erroredResult + times, "Incorrect result was returned");
done();
});
});
it('retry when some attempts fail and error test returns false at some invokation',function(done) {
var callCount = 0;
var error = 'ERROR';
var special = 'SPECIAL_ERROR';
var erroredResult = 'RESULT';
function fn(callback) {
callCount++;
var err = callCount === 2 ? special : error + callCount;
callback(err, erroredResult + callCount);
}
function errorTest(err) {
return err && err === error + callCount; // just a different pattern
}
var options = {
errorFilter: errorTest
};
async.retry(options, fn, function(err, result){
assert.equal(callCount, 2, "did not retry the correct number of times");
assert.equal(err, special, "Incorrect error was returned");
assert.equal(result, erroredResult + 2, "Incorrect result was returned");
done();
});
});
it('retry with interval when some attempts fail and error test returns false at some invokation',function(done) {
this.retries(3); // flakey test
var interval = 50;
var callCount = 0;
var error = 'ERROR';
var erroredResult = 'RESULT';
var special = 'SPECIAL_ERROR';
var specialCount = 3;
function fn(callback) {
callCount++;
var err = callCount === specialCount ? special : error + callCount;
callback(err, erroredResult + callCount);
}
function errorTest(err) {
return err && err !== special;
}
var start = new Date().getTime();
async.retry({ interval: interval, errorFilter: errorTest }, fn, function(err, result){
var now = new Date().getTime();
var duration = now - start;
assert(duration >= (interval * (specialCount - 1)), 'did not include interval');
assert.equal(callCount, specialCount, "did not retry the correct number of times");
assert.equal(err, special, "Incorrect error was returned");
assert.equal(result, erroredResult + specialCount, "Incorrect result was returned");
done();
});
});
it('retry when first attempt succeeds and error test should not be called',function(done) {
var callCount = 0;
var error = 'ERROR';
var erroredResult = 'RESULT';
var continueTestCalled = false;
function fn(callback) {
callCount++;
callback(null, erroredResult + callCount);
}
function errorTest(err) {
continueTestCalled = true;
return err && err === error;
}
var options = {
errorFilter: errorTest
};
async.retry(options, fn, _.rest(function(args) {
assert.equal(callCount, 1, "did not retry the correct number of times");
expect(args).to.be.eql([null, erroredResult + callCount]);
assert.equal(continueTestCalled, false, "error test function was called");
done();
}));
});
});
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