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<!DOCTYPE html>
<html>
<!--
Copyright 2009 The Closure Library Authors. All Rights Reserved.
Author: brenneman@google.com (Shawn Brenneman)
-->
<head>
<title>Closure Unit Tests - goog.async.DeferredList</title>
<script src="../../../../../closure/goog/base.js"></script>
<script>
goog.require('goog.array');
goog.require('goog.async.Deferred');
goog.require('goog.async.DeferredList');
goog.require('goog.testing.jsunit');
</script>
</head>
<body>
<script>
var Deferred = goog.async.Deferred;
var DeferredList = goog.async.DeferredList;
/**
* A list of unhandled errors.
* @type {Array.<Error>}
*/
var storedErrors = [];
/**
* Adds a catch-all error handler to deferred objects. Unhandled errors that
* reach the catch-all will be rethrown during tearDown.
*
* @param {...Deferred} var_args A list of deferred objects.
*/
function addCatchAll(var_args) {
for (var i = 0, d; d = arguments[i]; i++) {
d.addErrback(function(res) {
storedErrors.push(res);
});
}
}
/**
* Checks storedErrors for unhandled errors. If found, the error is rethrown.
*/
function checkCatchAll() {
var err = storedErrors.shift();
goog.array.clear(storedErrors);
if (err) {
throw err;
}
}
function tearDown() {
checkCatchAll();
}
function neverHappen(res) {
fail('This should not happen');
}
function testNoInputs() {
var count = 0;
var d = new DeferredList([]);
d.addCallback(function(res) {
assertArrayEquals([], res);
count++;
});
addCatchAll(d);
assertEquals('An empty DeferredList should fire immediately with an empty ' +
'list of results.',
1, count);
}
function testNoInputsAndFireOnOneCallback() {
var count = 0;
var d = new DeferredList([], true);
d.addCallback(function(res) {
assertArrayEquals([], res);
count++;
});
addCatchAll(d);
assertEquals('An empty DeferredList with opt_fireOnOneCallback set should ' +
'not fire unless callback is invoked explicitly.',
0, count);
d.callback([]);
assertEquals('Calling callback explicitly should still fire.', 1, count);
}
function testDeferredList() {
var count = 0;
var results;
var a = new Deferred();
var b = new Deferred();
var c = new Deferred();
var dl = new DeferredList([a, b, c]);
dl.addCallback(function(res) {
assertEquals('Expected 3 Deferred results.', 3, res.length);
assertTrue('Deferred a should return success.', res[0][0]);
assertFalse('Deferred b should return failure.', res[1][0]);
assertTrue('Deferred c should return success.', res[2][0]);
assertEquals('Unexpected return value for a.', 'A', res[0][1]);
assertEquals('Unexpected return value for c.', 'C', res[2][1]);
assertEquals('B', res[1][1]);
count++;
});
addCatchAll(dl);
c.callback('C');
assertEquals(0, count);
b.errback('B');
assertEquals(0, count);
a.callback('A');
checkCatchAll();
assertEquals('DeferredList should fire on last call or errback.', 1, count);
}
function testFireOnFirstCallback() {
var a = new Deferred();
var b = new Deferred();
var c = new Deferred();
var dl = new DeferredList([a, b, c], true);
dl.addCallback(function(res) {
assertEquals('Should be the deferred index in this mode.', 1, res[0]);
assertEquals('B', res[1]);
});
dl.addErrback(neverHappen);
addCatchAll(dl);
a.errback('A');
b.callback('B');
// Shouldn't cause any more callbacks on the DeferredList.
c.callback('C');
}
function testFireOnFirstErrback() {
var a = new Deferred();
var b = new Deferred();
var c = new Deferred();
var dl = new DeferredList([a, b, c], false, true);
dl.addCallback(neverHappen);
dl.addErrback(function(res) {
assertEquals('A', res);
// Return a non-error value to break out of the errback path.
return true;
});
addCatchAll(dl);
b.callback('B');
a.errback('A');
// Shouldn't cause any more callbacks on the DeferredList.
c.callback('C');
}
function testNoConsumeErrors() {
var count = 0;
var a = new Deferred();
var dl = new DeferredList([a]);
a.addErrback(function(res) {
count++;
return true;
});
addCatchAll(a, dl);
a.errback('oh noes');
assertEquals(1, count);
}
function testConsumeErrors() {
var count = 0;
var a = new Deferred();
var dl = new DeferredList([a], false, false, true);
a.addErrback(neverHappen);
addCatchAll(a, dl);
a.errback('oh noes');
assertEquals(0, count);
}
function testNesting() {
function upperCase(res) {
return res.toUpperCase();
}
// Concatenates a list of callback or errback results into a single string.
function combine(res) {
return goog.array.map(res, function(result) {
return result[1];
}).join('');
}
var a = new Deferred();
var b = new Deferred();
var c = new Deferred();
var d = new Deferred();
a.addCallback(upperCase);
b.addCallback(upperCase);
c.addCallback(upperCase);
d.addCallback(upperCase);
var dl1 = new DeferredList([a, b]);
var dl2 = new DeferredList([c, d]);
dl1.addCallback(combine);
dl2.addCallback(combine);
var dl3 = new DeferredList([dl1, dl2]);
dl3.addCallback(combine);
dl3.addCallback(function(res) {
assertEquals('AbCd', res);
});
addCatchAll(dl1, dl2, dl3);
a.callback('a');
c.callback('c');
b.errback('b');
d.errback('d');
}
function testGatherResults() {
var a = new Deferred();
var b = new Deferred();
var c = new Deferred();
var dl = DeferredList.gatherResults([a, b, c]);
dl.addCallback(function(res) {
assertArrayEquals(['A', 'B', 'C'], res);
});
addCatchAll(dl);
b.callback('B');
a.callback('A');
c.callback('C');
}
function testGatherResultsFailure() {
var a = new Deferred();
var b = new Deferred();
var c = new Deferred();
var dl = DeferredList.gatherResults([a, b, c]);
var firedErrback = false;
var firedCallback = false;
dl.addCallback(function() {
firedCallback = true;
});
dl.addErrback(function() {
firedErrback = true;
return true;
});
addCatchAll(dl);
b.callback('B');
a.callback('A');
c.errback();
assertTrue('Errback should be called', firedErrback);
assertFalse('Callback should not be called', firedCallback);
}
function testGatherResults_cancelCancelsChildren() {
var cancelled = [];
var a = new Deferred(function() {
cancelled.push('a');
});
var b = new Deferred(function() {
cancelled.push('b');
});
var c = new Deferred(function() {
cancelled.push('c');
});
var dl = new DeferredList([a, b, c]);
var firedErrback = false;
var firedCallback = false;
dl.addCallback(function() {
firedCallback = true;
});
dl.addErrback(function() {
firedErrback = true;
return true;
});
addCatchAll(dl);
b.callback('b');
dl.cancel();
assertTrue('Errback should be called', firedErrback);
assertFalse('Callback should not be called', firedCallback);
assertArrayEquals(['a', 'c'], cancelled);
}
function testErrorCancelsPendingChildrenWhenFireOnFirstError() {
var cancelled = [];
var a = new Deferred(function() {
cancelled.push('a');
});
var b = new Deferred(function() {
cancelled.push('b');
});
var c = new Deferred(function() {
cancelled.push('c');
});
var dl = new DeferredList([a, b, c], false, true);
var firedErrback = false;
var firedCallback = false;
dl.addCallback(function() {
firedCallback = true;
});
dl.addErrback(function() {
firedErrback = true;
return true;
});
addCatchAll(dl);
a.callback('a')
b.errback();
assertTrue('Errback should be called', firedErrback);
assertFalse('Callback should not be called', firedCallback);
assertArrayEquals('Only C should be cancelled since A and B finished.',
['c'], cancelled);
}
function testErrorDoesNotCancelPendingChildrenForVanillaLists() {
var cancelled = [];
var a = new Deferred(function() {
cancelled.push('a');
});
var b = new Deferred(function() {
cancelled.push('b');
});
var c = new Deferred(function() {
cancelled.push('c');
});
var dl = new DeferredList([a, b, c]);
var firedErrback = false;
var firedCallback = false;
dl.addCallback(function() {
firedCallback = true;
});
dl.addErrback(function() {
firedErrback = true;
return true;
});
addCatchAll(dl);
a.callback('a')
b.errback();
c.callback('c')
assertFalse('Errback should not be called', firedErrback);
assertTrue('Callback should be called', firedCallback);
assertArrayEquals('No cancellations', [], cancelled);
}
</script>
</body>
</html>
|
