[karma-tests] Add more tests for TextRange
[karma-tests] Add more tests for TextRange

Bug: chromium:1032561
Change-Id: I3f195636f7371477085ae8a9c13b1909297f5e8c
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2003317
Commit-Queue: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>
Reviewed-by: Almothana Athamneh <706f26a62e50fed4f186b9ee03c9abd1857b411a@google.com>
Reviewed-by: Paul Lewis <8915f5d5c39a08c5a3e8a8d7314756e4580816f9@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend