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test_promise.js
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test_promise.js
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//
// Tests the Promise class.
//
// Copyright (c) The Dojo Foundation 2011. All Rights Reserved.
//
/*global define module test raises equal deepEqual ok*/
define([
'coweb/util/Promise'
], function(Promise) {
module('promise', {
setup: function() {
this.p = new Promise();
}
});
test('single resolve', 2, function() {
this.p.resolve();
raises(this.p.resolve);
raises(this.p.fail);
});
test('single fail', 2, function() {
this.p.fail();
raises(this.p.resolve);
raises(this.p.fail);
});
test('resolve listeners', 11, function() {
var target = {a : 'a', b : 'b'},
chainVal = 'ignored',
chainErr = new Error('ignored'),
errored;
this.p.then(function(val) {
deepEqual(val, target);
return chainVal;
}).then(function(val) {
equal(val, chainVal);
});
this.p.then(function(val) {
deepEqual(val, target);
return chainErr;
}).then(null, function(err) {
equal(err, chainErr);
});
this.p.then(function(val) {
deepEqual(val, target);
throw chainErr;
}).then(null, function(err) {
equal(err, chainErr);
});
this.p.then(function(val) {
equal(val, target);
}).then(function(val) {
deepEqual(val, target);
});
errored = this.p.resolve(target);
ok(errored, 'listener threw error');
this.p.then(function(val) {
equal(val, target);
}).then(function(val) {
deepEqual(val, target);
});
});
test('fail listeners', 11, function() {
var target = new Error('target error'),
chainVal = 'ignored',
chainErr = new Error('ignored'),
errored;
this.p.then(null, function(err) {
equal(err, target);
return 'ignored';
}).then(function(val) {
equal(val, chainVal);
});
this.p.then(null, function(err) {
equal(err, target);
return chainErr;
}).then(null, function(err) {
equal(err, chainErr);
});
this.p.then(null, function(err) {
equal(err, target);
throw chainErr;
}).then(null, function(err) {
equal(err, chainErr);
});
this.p.then(null, function(err) {
equal(err, target);
}).then(function(val) {
equal(val, target);
});
errored = this.p.fail(target);
ok(errored, 'listener threw error');
this.p.then(null, function(err) {
equal(err, target);
}).then(function(val) {
equal(val, target);
});
});
test('promise chain', 6, function() {
var target = {a : 'a', b : 'b'},
chainSuccessPromise = new Promise(),
chainTarget = {c : 'c', d : 'd'},
chainFailurePromise = new Promise(),
chainErr = new Error('promise error');
this.p.then(function(val) {
deepEqual(val, target);
return chainSuccessPromise;
}).then(function(val) {
deepEqual(val, chainTarget);
}).then(function(val) {
deepEqual(val, chainTarget);
return chainFailurePromise;
}).then(null, function(err) {
equal(err, chainErr);
}).then(function(val) {
equal(val, chainErr);
});
// make sure original chain still works
this.p.then(function(val) {
deepEqual(val, target);
});
this.p.resolve(target);
chainSuccessPromise.resolve(chainTarget);
chainFailurePromise.fail(chainErr);
});
test('context', 6, function() {
var target = {a : 'a', b : 'b'},
chainSuccessPromise = new Promise(),
chainTarget = {c : 'c', d : 'd'},
obj = {
sentinel : 'sentinel',
callback : function(val) {
equal(this.sentinel, 'sentinel');
deepEqual(val, target);
return chainSuccessPromise;
},
chainCallback : function(val) {
equal(this.sentinel, 'sentinel');
deepEqual(val, chainTarget);
},
errback : function(err) {
equal(this.sentinel, 'sentinel');
}
};
this.p.then('callback', null, obj).then('chainCallback', null, obj);
this.p.then(obj.callback, null, obj);
this.p.resolve(target);
chainSuccessPromise.resolve(chainTarget);
});
});