async prepareTestServer(env, port) {
    let serverEnv = JSON.parse(JSON.stringify(env));
    serverEnv.SQLITE_FILEPATH = "/tmp/sctestdb_server";
    serverEnv.REMOTE_QUERIES = true;
    spawnSync("packages/saltcorn-cli/bin/saltcorn", ["fixtures", "-r"], {
      stdio: "inherit",
      env: serverEnv,
    });

    const server = spawn(
      "packages/saltcorn-cli/bin/saltcorn",
      ["serve", "-p", port],
      {
        stdio: "inherit",
        env: serverEnv,
      }
    );
    await sleep(2000);
    return server;
  }
Prepare and start Test Instance of Saltcorn server
@param env - environment variables
@param port - ip port to start server
@returns {Promise<ChildProcess>}