Swap out mocha/chai for jest

jest.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+    setupFiles: ["./jest.setup.js"],
+    moduleFileExtensions: ["ts", "tsx", "js", "jsx"],
+    transform: {
+        "^.+\\.(js|jsx|ts|tsx)$": "babel-jest",
+    },
+    // testMatch: ["**/?(*.)+(test).[jt]s?(x)"],
+    testEnvironment: "jsdom",
+};