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>

__tests__/view/shell/mobile/TabsSelector.test.tsx

@@ -0,0 +1,17 @@
+import React from 'react'
+import {Animated} from 'react-native'
+import renderer from 'react-test-renderer'
+import {TabsSelector} from '../../../../src/view/shell/mobile/TabsSelector'
+// import {render} from '../../../../jest/test-utils'
+
+describe('TabsSelector', () => {
+  const mockedProps = {
+    active: true,
+    tabMenuInterp: new Animated.Value(0),
+    onClose: jest.fn(),
+  }
+  it('renders correctly', () => {
+    const tree = renderer.create(<TabsSelector {...mockedProps} />).toJSON()
+    expect(tree).toMatchSnapshot()
+  })
+})