1. npm install at the root of angular
2. npm run build.dev to build local @ionic/angular and @ionic/core
3. cd test/testapp to the test app
4. npm install in the test app directory
5. npm run serve copies packages and serve the app (see package.json for more options)
6. http://localhost:4200/

npm link doesn't work as expected due to the devDependency on @angular/core. This is the work around...

npm run build.link ../ionic-conference-app

When the command above is ran from the angular directory, it will build @ionic/angular and copy the dist directory to the correct location of another local project. In the example above, the end result is that it copies the dist directory to ../ionic-conference-app/node_modules/@ionic/angular/dist. The path given should be relative to the root of this mono repo.