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>

jest/jestSetup.js

@@ -0,0 +1,39 @@
+jest.mock('@react-native-async-storage/async-storage', () =>
+  require('@react-native-async-storage/async-storage/jest/async-storage-mock'),
+)
+jest.mock('react-native/Libraries/EventEmitter/NativeEventEmitter')
+
+jest.mock('@fortawesome/react-native-fontawesome', () => ({
+  FontAwesomeIcon: '',
+}))
+
+require('react-native-reanimated/lib/reanimated2/jestUtils').setUpTests()
+
+// Silence the warning: Animated: `useNativeDriver` is not supported
+jest.mock('react-native/Libraries/Animated/NativeAnimatedHelper')
+
+jest.mock('react-native-safe-area-context', () => {
+  const inset = {top: 0, right: 0, bottom: 0, left: 0}
+  return {
+    SafeAreaProvider: jest.fn().mockImplementation(({children}) => children),
+    SafeAreaConsumer: jest
+      .fn()
+      .mockImplementation(({children}) => children(inset)),
+    useSafeAreaInsets: jest.fn().mockImplementation(() => inset),
+  }
+})
+
+jest.mock('@gorhom/bottom-sheet', () => {
+  const react = require('react-native')
+  return {
+    __esModule: true,
+    default: react.View,
+    namedExport: {
+      ...require('react-native-reanimated/mock'),
+      ...jest.requireActual('@gorhom/bottom-sheet'),
+      BottomSheetFlatList: react.FlatList,
+    },
+  }
+})
+
+jest.useFakeTimers()