Created
December 13, 2012 11:58
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Exploring layout of a sequence of async steps to setup, run and teardown a series of unit tests, using task.js. You'll need a recent Firefox for the generator (yield) support.
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| <html> | |
| <head><title>Async unit testing with task.js (exploration)</title></head> | |
| <script type="application/javascript" src="https://raw.github.com/mozilla/task.js/master/lib/task.js"></script> | |
| <script type="application/javascript;version=1.8"> | |
| function go() { | |
| var { spawn, join, TaskResult, Deferred } = task; | |
| var mydata = { foo: "bar" }; | |
| // shared functions for test setup | |
| function reset() { | |
| var defd = new Deferred(); | |
| setTimeout(function(){ | |
| delete mydata.foo; | |
| delete mydata.ready; | |
| delete mydata.buzz; | |
| defd.resolve(mydata); | |
| }, 0); | |
| return defd.promise; | |
| } | |
| function initialData(){ | |
| var defd = new Deferred(); | |
| setTimeout(function(){ | |
| mydata.ready = true; | |
| defd.resolve(mydata); | |
| }, 0); | |
| return defd.promise; | |
| } | |
| // indicate test group completion | |
| function finish(){ | |
| console.log("Tests done"); | |
| } | |
| spawn(function(){ | |
| yield spawn(function() { | |
| var emptyData = yield reset(); | |
| console.log("Verify setup"); | |
| console.assert(undefined === mydata.foo, "foo is undefined"); | |
| console.assert(!mydata.ready, "ready is falsy"); | |
| // more setup | |
| var readyData = yield initialData(); | |
| console.assert(!!mydata.ready, "ready is truthy"); | |
| console.log("/Verify setup"); | |
| console.log("conduct test"); | |
| var outcome = yield testSomething(); | |
| console.log("/conduct test"); | |
| }); | |
| yield spawn(function() { | |
| console.log("test setup"); | |
| var emptyData = yield reset(); | |
| var readyData = yield initialData(); | |
| console.assert(undefined === mydata.buzz, "buzz is undefined"); | |
| // more setup | |
| console.log("/test setup, conduct test"); | |
| var outcome = yield testSomething(); | |
| console.log("/conduct test"); | |
| }); | |
| finish(); | |
| }); | |
| function testSomething(){ | |
| var defd = new Deferred(); | |
| console.assert(undefined == mydata.buzz); | |
| setTimeout(function(){ | |
| mydata.buzz = Date.now(); | |
| setTimeout(function(){ | |
| var now = Date.now(); | |
| console.assert(now < mydata.buzz, "some time elapsed (fails)"); | |
| defd.resolve(true); | |
| }, 25); | |
| }, 25); | |
| return defd.promise; | |
| } | |
| } | |
| </script> | |
| <body onload="go()"> | |
| <h1>Async unit testing w. task.js</h1> | |
| <p>Just a proof of concept. See console for output</p> | |
| </body> | |
| </html> |
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