Function createAppFixture

integration/helpers/create-fixture.ts:284–432

(fixture: Fixture, mode?: ServerMode)

 * It also means that sometimes the CLI is skipped over in those tests, missing out on code paths that should be tested.
 */
export async function createAppFixture(fixture: Fixture, mode?: ServerMode) {
  let startAppServer = async (): Promise<{
    port: number;
    stop: VoidFunction;
  }> => {
    if (fixture.useReactRouterServe) {
      let port = await getPort();
      let { stop } = await spawnTestServer({
        cwd: fixture.projectDir,
        command: [
          process.argv[0],
          "node_modules/@react-router/serve/dist/cli.js",
          "build/server/index.js",
        ],
        env: {
          NODE_ENV: mode || "production",
          PORT: port.toFixed(0),
        },
        regex: /\[react-router-serve\] http:\/\/localhost:(\d+)\s/,
        validate: (matches) => {
          let parsedPort = parseInt(matches[1], 10);
          if (port !== parsedPort) {
            throw new Error(
              `Expected react-router-serve to start on port ${port}, but it started on port ${parsedPort}`,
            );
          }
        },
      });
      return { stop, port };
    }

    if (fixture.isSpaMode) {
      return new Promise(async (accept) => {
        let port = await getPort();
        let app = express();
        app.use(express.static(path.join(fixture.projectDir, "build/client")));
        app.get("*", (_, res) =>
          res.sendFile(
            path.join(fixture.projectDir, "build/client/index.html"),
          ),
        );
        let server = app.listen(port);
        accept({ stop: server.close.bind(server), port });
      });
    }

    if (fixture.prerender) {
      return new Promise(async (accept) => {
        let port = await getPort();
        let app = express();
        app.use(
          express.static(path.join(fixture.projectDir, "build", "client")),
        );
        app.get("*", (req, res, next) => {
          let dir = path.join(fixture.projectDir, "build", "client");
          let filePath;
          if (req.path.endsWith(".data")) {
            filePath = path.join(dir, req.path);