feat: upgrade test packages to jest

The packages nyc and expect.js didn't have any active commits in many years. jest seems like a sensible choice to switch to. In future, the tests might be better refactored to remove the done callback pattern and use proper promises. Another thing I couldn't easily fix is the beforeEach delay of 200ms, this makes tests unnecessarily slow.
gynzy · Dec 29, 2023 · b6bbc7a · b6bbc7a
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diff --git a/jest.config.js b/jest.config.js
@@ -0,0 +1,5 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+  preset: "ts-jest",
+  testEnvironment: "node",
+};