Unit testing (#32)

* add testing lib

* remove coverage folder from git

* finished basic test setup

* fix tests typescript and import paths

* add first snapshot

* testing utils

* rename test files; update script flags; ++tests

* testing utils functions

* testing downloadAndResize wip

* remove download test

* specify unwanted coverage paths;
remove update snapshots flag

* fix strings tests

* testing downloadAndResize method

* increasing testing

* fixing snapshots wip

* fixed shell mobile snapshot

* adding snapshots for the screens

* fix onboard snapshot

* fix typescript issues

* fix TabsSelector snapshot

* Account for testing device's locale in ago() tests

* Remove platform detection on regex

Co-authored-by: Paul Frazee <pfrazee@gmail.com>

.gitignore

@@ -59,3 +59,6 @@ buck-out/
 # Ruby / CocoaPods
 /ios/Pods/
 /vendor/bundle/
+
+# Testing
+coverage/