How to do local development inside sub-folder instead of the root: "/" -> "/test/my-app/"

Ionic Framework
1

Hi:

I want to change from where to test my app in the local development.
Instead of testing on: “http://localhost:8100/”
I want to test on “http://localhost:8100/test/my-app/”

How to do that?

2

angular.json:

set:
projects → app → “root”: "/test/my-app/”,

add in build options:
projects → app → “architect” → “build” → “options”
“baseHref”: "/test/my-app/”,
“deployUrl”: "/test/my-app/”,

index.html:

base tag "/test/my-app/”