Add essential npm pkgs for front-end unit testing

Needed to install ts-jest to avoid typescript errors when trying to clear mocked implementation. See link below: kulshekhar/ts-jest#576 Also CRA has outdated jsdom (v14.1.0) which results in MutationObserver error when trying to use WaitFor's in react testing library. Needed to jsdom-sixteen package to run jest with jsdom v16. See the link below testing-library/dom-testing-library#477
jonotp · Oct 25, 2020 · b4c926a · b4c926a
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diff --git a/client/jest.config.js b/client/jest.config.js
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+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};