Tests (#2499)

* Setup jest framework for unit tests

* Move tests to a separate package

* Remove test script

tests/jest.config.json

@@ -0,0 +1,9 @@
+{
+    "verbose": true,
+    "transform": {},
+    "extensionsToTreatAsEsm": [],
+    "preset": "jest-puppeteer",
+    "setupFilesAfterEnv": [
+        "<rootDir>/jest.setup.js"
+    ]
+}