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From: storm.mark@gmail.com
Newsgroups: comp.lang.javascript
Subject: Is this the only way to unit-test an events abstraction?
Date: Tue, 20 Dec 2011 09:16:52 -0800 (PST)
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Hi,

I have two questions:

1.) How best to unit-test an event listener?
2.) Have I properly understood isHostMethod?

I'm trying to unit-test an event listener abstraction but the only way I ca=
n think to test it is against the window 'load' event.

I've a code example here: https://gist.github.com/1502326

Also, I'm using David Mark's (@cinsoft) isHostMethod to detect the relevant=
 host object support but was wondering if I had properly understood the con=
cepts or not? So for example, am I right in thinking that a host object/met=
hod should be available under the following conditions (although I understa=
nd that these 'conditions' are unreliable):

- if typeof returns 'function' (for majority browsers)
- if typeof returns 'unknown' (for IE < 9 where its implementation used Act=
iveX objects for native Functions)
- if typeof returns 'object' and the value isn't 'null' (because ES3 specs =
have allowed null to return 'object' which is incorrect behaviour)

If any of these conditions are true then that (again, unreliably) *should* =
mean that the specified host method is available to use.

But even still the host object/method might be implemented differently to h=
ow the specification dictates it should be and so it would be more accurate=
 to do full 'feature detection' where I create the object and see if an eve=
nt is triggered (or some similar test)?

Thanks for any advice regarding both these enquiries.

Mark.