I used the following command to run my game in the iphone simulator and it works great (takes a while to compile, but that's ok. I'm building for web first anyways)
cocos run -p ios
I want to be able to test using the ipad simulator and preferably my own ipad, but I'm unsure how to do that.
I was able to change the target device in XCode under product>destination in the top menu options.
I ran the project, and although it does take a very long time, it well eventually compile and run on the device you choose.
I'd still prefer there to be a cmdline way to change the device, but as long as I can do it one way or another, then i can move forward.