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>

__mocks__/@react-native-camera-roll/camera-roll.js

@@ -0,0 +1,3 @@
+export default {
+  CameraRoll: jest.fn(),
+}

__mocks__/async-storage.js

@@ -1 +0,0 @@
-export default from '@react-native-async-storage/async-storage/jest/async-storage-mock'

__mocks__/react-native-image-crop-picker.js

@@ -0,0 +1,3 @@
+export default {
+  openPicker: jest.fn().mockImplementation(() => Promise.resolve(result)),
+}

__mocks__/rn-fetch-blob.js

@@ -0,0 +1,10 @@
+jest.mock('rn-fetch-blob', () => {
+  return {
+    __esModule: true,
+    default: {
+      fs: {
+        unlink: jest.fn(),
+      },
+    },
+  }
+})