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frontend/__mocks__/zustand.ts

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+import { act } from "@testing-library/react";
+import type * as ZustandExportedTypes from "zustand";
+export * from "zustand";
+
+const { create: actualCreate, createStore: actualCreateStore } =
+  jest.requireActual<typeof ZustandExportedTypes>("zustand");
+
+// a variable to hold reset functions for all stores declared in the app
+export const storeResetFns = new Set<() => void>();
+
+const createUncurried = <T>(
+  stateCreator: ZustandExportedTypes.StateCreator<T>
+) => {
+  const store = actualCreate(stateCreator);
+  const initialState = store.getInitialState();
+  storeResetFns.add(() => {
+    store.setState(initialState, true);
+  });
+  return store;
+};
+
+// when creating a store, we get its initial state, create a reset function and add it in the set
+export const create = (<T>(
+  stateCreator: ZustandExportedTypes.StateCreator<T>
+) => {
+  console.log("zustand create mock");
+
+  // to support curried version of create
+  return typeof stateCreator === "function"
+    ? createUncurried(stateCreator)
+    : createUncurried;
+}) as typeof ZustandExportedTypes.create;
+
+const createStoreUncurried = <T>(
+  stateCreator: ZustandExportedTypes.StateCreator<T>
+) => {
+  const store = actualCreateStore(stateCreator);
+  const initialState = store.getInitialState();
+  storeResetFns.add(() => {
+    store.setState(initialState, true);
+  });
+  return store;
+};
+
+// when creating a store, we get its initial state, create a reset function and add it in the set
+export const createStore = (<T>(
+  stateCreator: ZustandExportedTypes.StateCreator<T>
+) => {
+  console.log("zustand createStore mock");
+
+  // to support curried version of createStore
+  return typeof stateCreator === "function"
+    ? createStoreUncurried(stateCreator)
+    : createStoreUncurried;
+}) as typeof ZustandExportedTypes.createStore;
+
+// reset all stores after each test run
+afterEach(() => {
+  act(() => {
+    storeResetFns.forEach((resetFn) => {
+      resetFn();
+    });
+  });
+});