Package Exports

mocha-chai-jest-snapshot
mocha-chai-jest-snapshot/dist/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (mocha-chai-jest-snapshot) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

🍵mocha-chai-jest-snapshot📷

npm MIT

provides snapshot testing like jest

Features

✅ Simple to use
✅ Output the same snapshot file as jest
✅ Output the same snapshot summary as jest
✅ Detect obsolete snapshots
✅ Support custom serializer
✅ Support typescript

Usage

npm i -D mocha-chai-jest-snapshot

then add it to the test setup:

// e.g. setup.js (mocha --file setup.js)
const chai = require("chai");
const { jestSnapshotPlugin } = require("mocha-chai-jest-snapshot");

chai.use(jestSnapshotPlugin());

enjoy.

const { expect } = require("chai");
it("foo", function () {
  expect({ foo: "bar" }).toMatchSnapshot();
});

> chai-snapshot@1.0.0 test /mnt/x/chai-snapshot
> npx mocha --file setup.js -r ts-node/register test/**/*.ts


  ✓ foo

Snapshot Summary
 › 1 snapshot written from 1 test suite.

  1 passing (9ms)

// Jest Snapshot v1, https://goo.gl/fbAQLP

exports[`foo 1`] = `
Object {
  "foo": "bar",
}
`;

update snapshots

# set envoriment
UPDATE_SNAPSHOT=1 mocha ...
# or add command line argument
mocha ... --update

report at the end

npx mocha ... --reporter mocha-chai-jest-snapshot/reporters/spec

with options

jest options (setup)

const chai = require("chai");
const { jestSnapshotPlugin } = require("mocha-chai-jest-snapshot");

chai.use(
  jestSnapshotPlugin({
    rootDir: "../",
    snapshotResolver: "<rootDir>/jest/snapshotResolver",
    snapshotSerializers: ["jest-serializer-vue"],
  })
);

jest options (package.json)

{
  "jest": {
    "rootDir": "../",
    "snapshotResolver": "<rootDir>/jest/snapshotResolver",
    "snapshotSerializers": ["jest-serializer-vue"]
  }
}

jest options (jest.config.js)

module.exports = {
  rootDir: "../",
  snapshotResolver: "<rootDir>/jest/snapshotResolver",
  snapshotSerializers: ["jest-serializer-vue"],
};

custom serializer

const chai = require("chai");
const {
  jestSnapshotPlugin,
  addSerializer,
} = require("mocha-chai-jest-snapshot");
const customSerializer = require("...");

chai.use(jestSnapshotPlugin());
addSerializer(customSerializer);

const { expect } = require("chai");
const customSerializer = require("...");

expect.addSnapshotSerializer(customSerializer);