m.test

m(icro)test is a lightweight test runner for node.js written in es6+ (~4kb).

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install

install m.test directly from npm to project's devDependencies.

npm install --save-dev m.test

usage

test files are run by simply passing them to node. for a given test/index.js run the following command to execute the suite:

node test

run the following one to enable node's debugger:

node debug test

cli

more utilities to run your suites are available through the cli. if no files are given they will be looked up from ./test recursively.

m.test [options] [files]

when executing suites through the cli m.test will be assigned to global.test by design. the following line can be omitted:

const {test} = require('m.test')

further instructions can be accessed via --help flag and man-pages by executing either m.test --help or man m.test within your shell.

---

basic usage

const {ok} = require('assert')

test('it just works!', function () {
  ok(true)
})

async usage

const {ok} = require('assert')

test('it works async too!', function (done) {
  setTimeout(function () {
    ok(true)
    done()
  }, 0)
})

test('done takes a error argument!', function (done) {
  setTimeout(function (err = null) {
    done(err)
  }, 0)
})

test('runner works with Promise', function (done) {
    let promise = new Promise(function (resolve, reject) {
      setTimeout(function () {
        resolve(true)
      }, 0)
    })

    promise.then(result => {
      ok(result)
      done()
    })
  })

context usage

test('can be used as a context', function () {
  test('works!', function (done) {
    done(null)
  })
  test('works!', function (done) {
    done(null)
  })
})

alias usage

const {test: context, test: describe, test: it} = require('m.test')

context('given some context', function () {
  describe('your subject', function () {
    it('just works!', (done) => done(null))
  })
})

beforeEach afterEach usage

test('description', function (done) {
  done(null)
})
beforeEach(done => setup(done))
afterEach(done => teardown(done))

it is important to call beforeEach and afterEach wrap functions after test functions themselves. when using wraps within nested suites consider their contextual binding.

test('description 1', function () {
  test('description 1.1', Function.prototype)
  test('description 1.2', Function.prototype)
  beforeEach(done => setup(done))
  afterEach(done => teardown(done))
})
test('description 2', function () {
  test('description 2.1', Function.prototype)
  test('description 2.2', Function.prototype)
})

(in the example above hooks would be called for 1.1 e 1.2)

---

skip modifier

test.skip('description', function () {
  // this function will never be called
})

the skip modifier comes with an optional doSkip=true parameter that enables/disables the skip behavior according to the expression:

test.skip('description', function () {
  // this test will be skipped when NODE_ENV=CI
}, /CI/gi.test(process.env.NODE_ENV))

timeout modifier

test.timeout('description', function () {
  // this test will fail if it exceeds 200ms of execution
}, 200)

the timeout modifier comes with an optional doTimeout=true parameter that enables/disables the timeout behavior according to the expression:

test.timeout('description', function () {
  // this test will have a timeout when NODE_ENV=CI
}, 200, /CI/g.test(process.env.NODE_ENV))

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