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__/lib/numbers.test.ts

@@ -0,0 +1,24 @@
+import {clamp} from '../../src/lib/numbers'
+
+describe('clamp', () => {
+  const inputs: [number, number, number][] = [
+    [100, 0, 200],
+    [100, 0, 100],
+    [0, 0, 100],
+    [100, 0, -1],
+    [4, 1, 1],
+    [100, -100, 0],
+    [400, 100, -100],
+    [70, -1, 1],
+    [Infinity, Infinity, Infinity],
+  ]
+  const outputs = [100, 100, 0, -1, 1, 0, -100, 1, Infinity]
+
+  it('correctly clamps any given number and range', () => {
+    for (let i = 0; i < inputs.length; i++) {
+      const input = inputs[i]
+      const result = clamp(...input)
+      expect(result).toEqual(outputs[i])
+    }
+  })
+})