HTML and CSS Reference
In-Depth Information
this to the usual stubbing approach in which we stub the timer, do some work and
then assert that the stub was used as expected. Stubbing yields shorter tests, but
using the clock yields more communicative tests. We will use the clock to test the
poller to get a feel of the difference.
The
jsUnitMockTimeout.js
can be downloaded off the topic's website.
2
Copy it into the project's
lib
directory.
13.1.3.1 Scheduling New Requests
In order to test that the poller schedules new requests we need to:
•
Create a poller with a URL
•
Start the poller
•
Simulate the first request completing
•
Stub the
send
method over again
•
Fast-forward time the desired amount of milliseconds
•
Assert that the
send
method is called a second time (this would have been
called while the clock passed time)
To complete the request we will add yet another helper to the
fakeXML-
HttpRequest
object, which sets the HTTP status code to 200 and calls the
on-
readystatechange
handler with ready state 4. Listing 13.15 shows the new
method.
Listing 13.15
Adding a helper method to complete request
var fakeXMLHttpRequest = {
/* ... */
complete: function () {
this.status = 200;
this.readyStateChange(4);
}
};
Using this method, Listing 13.16 shows the test following the above require-
ments.
