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GitHub - power-assert-js/espower-traceur

power-assert instrumentor for Traceur Compiler

espower-traceur is a Node.js module loader that instruments power-assert feature into target ECMAScript6 sources on the fly.

Please note that espower-traceur is a beta version product. Pull-requests, issue reports and patches are always welcomed. See power-assert project for more documentation.

Given test/demo_test.js

let assert = require('power-assert')

class Person {
  constructor(name, age) {
    this.name = name
    this.age = age
  }
  getAge() {
    return this.age
  }
}

describe("Person", ()=>{
  let alice = new Person("alice", 3)
  let bob = new Person("bob", 5)
  it("#getAge", ()=>{
    assert(alice.getAge() === 3)
  })
  it("#name", ()=>{
    assert(alice.name === "alice")
  })
  // failed
  it("#mistake", ()=>{
    assert(alice.name === bob.name)
  })
})

Run mocha with --require 'espower-traceur/guess'

$ mocha --require 'espower-traceur/guess' test/demo_test.js

  ․․․

  2 passing (17ms)
  1 failing

  1) Person #mistake:
     AssertionError:   # /Users/yosuke/go/src/github.com/yosuke-furukawa/espower-traceur/test/demo_test.js:24

  assert(alice.name === bob.name)
         |     |    |   |   |
         |     |    |   |   "bob"
         |     |    |   Person{name:"bob",age:5}
         |     |    false
         |     "alice"
         Person{name:"alice",age:3}

  --- [string] bob.name
  +++ [string] alice.name
  @@ -1,3 +1,5 @@
  -bob
  +alice

See the power-assert output appears!

$ npm install espower-traceur -D

If your tests are located on 'test/**/*.js', just run mocha with --require 'espower-traceur/guess'

$ mocha --require 'espower-traceur/guess' test/**/*.js

You can set test directory in your package.json

{
    "name": "your-module",
    "description": "Your module",
    "version": "0.0.1",
    "directories": {
        "test": "spec/"
    },
...
}

Then, run mocha with --require 'espower-traceur/guess'

$ mocha --require 'espower-traceur/guess' spec/**/*.js

Note: 'espower-traceur/guess' is inspired by intelli-espower-loader

If you want to configure more explicitly, put espower-traceur-loader.js somewhere in your project.

require('espower-traceur')({
    // directory where match starts with
    cwd: process.cwd(),

    // glob pattern using minimatch module
    pattern: 'spec/unit/**/*.js',

    // options for espower module
    espowerOptions: {
        patterns: [
            'assert(value, [message])',
            'assert.ok(value, [message])',
            'assert.equal(actual, expected, [message])',
            'assert.notEqual(actual, expected, [message])',
            'assert.strictEqual(actual, expected, [message])',
            'assert.notStrictEqual(actual, expected, [message])',
            'assert.deepEqual(actual, expected, [message])',
            'assert.notDeepEqual(actual, expected, [message])'
        ]
    }
});

Then, run mocha with --require option

$ mocha --require ./path/to/espower-traceur-loader spec/unit/some_test_using_powerassert.js

• Yosuke Furukawa

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