chore: fix tests

__mocks__/jest.setup.js

@@ -0,0 +1,23 @@
+// Optional: configure or set up a testing framework before each test.
+// If you delete this file, remove `setupFilesAfterEnv` from `jest.config.js`
+
+// Used for __tests__/testing-library.js
+// Learn more: https://github.com/testing-library/jest-dom
+require("@testing-library/jest-dom/extend-expect");
+require("./modules");
+
+global.IntersectionObserver = class IntersectionObserver {
+  constructor() {}
+
+  observe() {
+    return null;
+  }
+
+  disconnect() {
+    return null;
+  }
+
+  unobserve() {
+    return null;
+  }
+};