CI Tests with Jest

[dcarpenter31]

Making this a draft PR. This is very close to something we can merge in, and will get CI testing started. I'm not sure why, but "@tensorflow/tfjs-react-native" is not transpiled by jest when running the tests, resulting in the error below.

Jest encountered an unexpected token

    This usually means that you are trying to import a file which Jest cannot parse, e.g. it's not plain JavaScript.

    By default, if Jest sees a Babel config, it will use that to transform your files, ignoring "node_modules".

    Here's what you can do:
     • If you are trying to use ECMAScript Modules, see https://jestjs.io/docs/en/ecmascript-modules for how to enable it.
     • To have some of your "node_modules" files transformed, you can specify a custom "transformIgnorePatterns" in your config.
     • If you need a custom transformation specify a "transform" option in your config.
     • If you simply want to mock your non-JS modules (e.g. binary assets) you can stub them out with the "moduleNameMapper" config option.

    You'll find more details and examples of these config options in the docs:
    https://jestjs.io/docs/en/configuration.html

    Details:

    /home/david/Documents/dev/monocle/node_modules/@tensorflow/tfjs-react-native/dist/index.js:17
    import './platform_react_native';
    ^^^^^^

    SyntaxError: Cannot use import statement outside a module

      3 | import { Camera } from "expo-camera";
      4 | import * as tf from "@tensorflow/tfjs";
    > 5 | import "@tensorflow/tfjs-react-native";
        | ^
      6 | import * as cocoSsd from "@tensorflow-models/coco-ssd";
      7 | import * as FileSystem from "expo-file-system";
      8 |

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1350:14)
      at Object.<anonymous> (components/CameraView.tsx:5:1)

[dcarpenter31]

Closing this: its very stale and we can focus on testing another time.