ReferenceError: describe is not defined

[maciej-gurban]

• babel-plugin-tester 5.0.0:
• node 8.7.0:
• npm 5.4.2:

Relevant code or config

const pluginTester = require('babel-plugin-tester');

// normally you would import this from your plugin module
function identifierReversePlugin() {
  return {
    name: 'identifier reverse',
    visitor: {
      Identifier(idPath) {
        idPath.node.name = idPath.node.name.split('').reverse().join('')
      },
    },
  }
}

pluginTester({
  plugin: identifierReversePlugin,
  snapshot: true,
  tests: [
    {code: '"hello";', snapshot: false},
    {
      code: 'var hello = "hi";',
      output: 'var olleh = "hi";',
    },
    `
      function sayHi(person) {
        return 'Hello ' + person + '!'
      }
      console.log(sayHi('Jenny'))
    `,
  ],
})

What you did:
Run the sample code from the docs

What happened:
Throws with:

  return describe(describeBlockTitle, function () {
  ^

ReferenceError: describe is not defined

[kentcdodds]

What testing framework are you using?

[maciej-gurban]

My bad, I didn't read the beggining of the docs. I assumed this lib ships with its own assertion/test runner. I'll try with Jest.

…

On Sat, May 5, 2018, 20:45 Kent C. Dodds ***@***.***> wrote: What testing framework are you using? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#24 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ADfnGFtY5kxdxfH2e6irUqKkdHfIrHrHks5tveUmgaJpZM4TzuA8> .

[blankzust]

node @kentcdodds

[kentcdodds]

@blankzust, this requires that you run your tests with a framework that supports global describe and it functions. Frameworks like Jest (recommended), Mocha, or Jasmine.

[blankzust]

ok,I will retry it and thx @kentcdodds

[Li357]

How do I get this to work? I've installed Jest globally (and locally), and I've read that Babel comes bundled with babel-jest which should handle the globals right (though I'm trying to use Babel 7, which may conflict with it). But I still get describe is not defined. Is there something I have to import, or configure with Babel/Jest?

[kentcdodds]

How are you running it?

[Li357]

That's what I'm not clear on. Am I supposed to let Jest search for the tests itself, or am I supposed to directly feed the JavaScript module I execute pluginTester into the Node REPL?

I tried:

node test/index.js
jest

Running jest plain does not find the tests. I don't have any Jest configuration.

[kentcdodds]

I recommend spending a few minutes in the jest documentation 👍