Angular CLI Karma test have to run twice

Hi

I'm working on an angular project with CLI version 1.0.0-beta.25.5 and typescript.

Typescript compiler is enabled but I have to run the test twice to see the changes. Are there any special steps to set it up ?

This is the first time I work with typescript so I might miss something, but since web storm converts every .ts file to plain javascript this must be some kind of sync issue with webstorm