Nock + Jest (Auto save fixtures with nockback)

jest.config.js

module.exports = {
  "transform": {
    ".(ts|tsx)": "<rootDir>/node_modules/ts-jest/preprocessor.js"
  },
  "setupTestFrameworkScriptFile": "<rootDir>/tests/setup.ts",
  "testEnvironment": "node",
  "testRegex": "(/__tests__/.*)\\.test\\.(ts|tsx|js)$",
  "moduleFileExtensions": [
    "ts",
    "tsx",
    "js",
    "json"
  ]
};

sample.md

For exec test :

yarn test

Use NOCK_BACK_MODE env for change nock back mode

setup.ts

import * as nock from 'nock';
import { dirname, basename, join } from 'path';
import 'reflect-metadata';

/**
 * get current test path
 */
function getTestPath(): string | undefined {
  if (Symbol && typeof Symbol.for === 'function') {
    const globalStateKey = Symbol.for('$$jest-matchers-object');
    if (globalStateKey) {
      const globalState = (<any>global)[globalStateKey];
      if (globalState) {
        const state = globalState.state;
        if (state) {
          return state.testPath;
        }
      }
    }
  }
}

interface NockBackValue {
  nockDone: () => void;
  context: nock.NockBackContext;
}

let value: NockBackValue | undefined;
let testPath: string | undefined;
let nb = 0;

beforeEach(async () => {
  const newPath = getTestPath();
  if (!newPath) {
    return;
  }

  if (testPath !== newPath) {
    testPath = newPath;
    nb = 0;
  } else {
    nb++;
  }

  const nockBack = nock.back;
  nockBack.fixtures = join(dirname(testPath), '__nocks__');
  value = await nockBack(`${basename(testPath)}.${nb}.json`);
  nock.enableNetConnect('127.0.0.1');
});

afterEach(async () => {
  if (value) {
    value.nockDone();
    value = undefined;
  }
});