ExtJS7: How to test `onAppUpdate` in dev or testing environment - extjs

Question

ExtJS v7.1 based application has onAppUpdate function and some other methods like onLaunch mentioned in documantation here for classic application. However in development and in testing environment these never gets fired. Is it as intended, if yes then how we can test onAppUpdate in dev or testing build. If no, then what could have gone wrong here.

Answer 1

You can achieve this by enabling Local Storage Cache for a specific build in your app.json file.
Example for the testing build:
/**
* Settings specific to testing builds.
*/
"testing": {
"cache": {
"enable": true
}
},
Every build on the testing environment will now call the onAppUpdate() function.

Answer 2

Note that you'll never see an onAppUpdate event triggered if you are using a dev build; it needs to be packaged (with caching enabled, as #ground_call points out). The point of onAppUpdate is that you've got a cached version which is older than what's now available - no cache, no onAppupdate
If you're willing to trust the infrastructure, and just test what your app does, you can always trigger the onAppUpdate event programmatically, either in a test script or from the JavaScript console.