inventory.test.js

const td = require("testdouble");
require("testdouble-jest")(td, jest);
const { gql } = require("apollo-server");
const { executeGraphql } = require("federation-testing-tool");

// This is the added line! Make sure it's above the line that requires resolvers.
const { estimateShipping } = td.replace("./estimateShipping");
// 

const { typeDefs } = require("./typeDefs");
const { resolvers } = require("./resolvers");
const service = { typeDefs, resolvers };