frontend/test-utils.tsx

// See https://redux.js.org/usage/writing-tests#setting-up-a-reusable-test-render-function for more information

import React, { PropsWithChildren } from "react";
import { Provider } from "react-redux";
import { configureStore } from "@reduxjs/toolkit";
import { RenderOptions, render } from "@testing-library/react";
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
import { I18nextProvider, initReactI18next } from "react-i18next";
import i18n from "i18next";
import { vi } from "vitest";
import { AppStore, RootState, rootReducer } from "./src/store";
import { AuthProvider } from "#/context/auth-context";
import { ConversationProvider } from "#/context/conversation-context";
import { SettingsProvider } from "#/context/settings-context";

// Mock useParams before importing components
vi.mock("react-router", async () => {
  const actual =
    await vi.importActual<typeof import("react-router")>("react-router");
  return {
    ...actual,
    useParams: () => ({ conversationId: "test-conversation-id" }),
  };
});

// Initialize i18n for tests
i18n.use(initReactI18next).init({
  lng: "en",
  fallbackLng: "en",
  ns: ["translation"],
  defaultNS: "translation",
  resources: {
    en: {
      translation: {},
    },
  },
  interpolation: {
    escapeValue: false,
  },
});

const setupStore = (preloadedState?: Partial<RootState>): AppStore =>
  configureStore({
    reducer: rootReducer,
    preloadedState,
  });

// This type interface extends the default options for render from RTL, as well
// as allows the user to specify other things such as initialState, store.
interface ExtendedRenderOptions extends Omit<RenderOptions, "queries"> {
  preloadedState?: Partial<RootState>;
  store?: AppStore;
}

// Export our own customized renderWithProviders function that creates a new Redux store and renders a <Provider>
// Note that this creates a separate Redux store instance for every test, rather than reusing the same store instance and resetting its state
export function renderWithProviders(
  ui: React.ReactElement,
  {
    preloadedState = {},
    // Automatically create a store instance if no store was passed in
    store = setupStore(preloadedState),
    ...renderOptions
  }: ExtendedRenderOptions = {},
) {
  function Wrapper({ children }: PropsWithChildren) {
    return (
      <Provider store={store}>
        <AuthProvider>
          <QueryClientProvider
            client={
              new QueryClient({
                defaultOptions: { queries: { retry: false } },
              })
            }
          >
            <SettingsProvider>
              <ConversationProvider>
                <I18nextProvider i18n={i18n}>{children}</I18nextProvider>
              </ConversationProvider>
            </SettingsProvider>
          </QueryClientProvider>
        </AuthProvider>
      </Provider>
    );
  }
  return { store, ...render(ui, { wrapper: Wrapper, ...renderOptions }) };
}