@onflow/flow-js-testing/src/cli/templates/test.js

This package will expose a set of utility methods, to allow Cadence code testing with libraries like Jest

/*
 * Flow JS Testing
 *
 * Copyright 2021 Dapper Labs, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

export default (name, basePath, comments) => `import path from "path";
import { emulator, init } from "@onflow/flow-js-testing";
${comments ? "\n// Increase timeout if your tests failing due to timeout" : ""}
jest.setTimeout(10000);

describe("${name}", ()=>{
  beforeEach(async () => {
    const basePath = path.resolve(__dirname, "${basePath}");
    const logging = false;
    
    await init(basePath);
    return emulator.start({ logging });
  });
  ${comments ? "\n // Stop emulator, so it could be restarted" : ""}
  afterEach(async () => {
    return emulator.stop();
  });
  
  test("basic assertion", async () => {
    ${comments ? "// WRITE YOUR ASSERTS HERE" : ""}
  })
})
`