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Knest

Enable rollback for your tests that use knex.

Knest works with most test frameworks out there.

Installation

npm install knest --save-dev

Usage

Example using mocha as the testing framework

This example is part of the knex mocha tests. They can be run using the following npm script.

const assert = require('assert')
const {
  mysql,
  users,
  resetDatabase,
  findUsers,
  createUsers,
  createUser
} = require('./index.spec')
const knest = require('./index').bind(null, mysql)

describe('Mocha & Knest', () => {
  it('should reset the database user table', () => resetDatabase(mysql))

  it('should create user in user table', () =>
    knest(trx =>
      createUser(trx, users[0]).then(record => {
        assert.strictEqual(record.name, users[0].name)
        assert.strictEqual(record.email, users[0].email)
      })
    ))

  it('should create users using multiple transactions', () =>
    knest(trx => createUsers(trx, users)))

  it('should have rolled back all the insert queries', () =>
    findUsers(mysql).then(result => assert.deepStrictEqual(result, [])))

  after(() => process.exit())
})

Reference

Knest exports a single function.

knest(knexConnection, testFn)

What Knest basically does is wrap the test function and adds a knex transaction as the first argument of the test callback function.

returns a promise which will rollback the transaction when it resolves. This is required. Throws if a promise is not returned.

knexConnection

This value should be a knex-connection or a knex transaction object.

testFn(knexTransaction)

The testFn is called when the tests are run. It is called with the following arguments

knexTransaction is an instance of a knex transaction that uses the previously configured knex connection.

Tests

Knest is tested using MySQL. Make sure you have MySQL installed. The ./setup.sql file makes it easy to setup a database and user for running the tests.

sudo mysql -p < setup.sql

Then install, prune and run the tests.

{ npm i && npm prune; } > /dev/null
npm t

> knest@1.1.3 test
> npx standard && npm run test-tape && npm run test-mocha


> knest@1.1.3 test-tape
> tape index.tape.spec.js

TAP version 13
# should reset the database user table
# should create user in user table
ok 1 should be loosely deeply equivalent
# should create users using multiple transactions
# should have rolled back all the insert queries
ok 2 should be loosely deeply equivalent

1..2
# tests 2
# pass  2

# ok


> knest@1.1.3 test-mocha
> mocha index.mocha.spec.js



  Mocha & Knest
    ✔ should reset the database user table (115ms)
    ✔ should create user in user table
    ✔ should create users using multiple transactions
    ✔ should have rolled back all the insert queries

Contribute

Feel free to contribute in whatever way you deem to be valuable.

Read more in the CONTRIBUTING.md

License

MIT