What is a best way to organize Test Suites / Test Cases in JavaScript?

• Do you put test cases in JSON / YAML or in separate JavaScript files?
• What keys do you put for each cases, such as Name, Assertion, Result?
• Do you print, i.e. console.log / console.dir(..., {depth: null}), results?
• Do you write "expect to fail" tests?

In my latest project, I use ts-mocha.

I put my test cases in JavaScript file, rather than JSON, because I need some special value (undefined).

My test cases is an array of ITestSuite.

interface ITestSuite {
  name: string
  cond: any
  expect: (result: any[]) => boolean
  obj: any
}

I console.log test results, as well as do automated assert, using standard library import assert from 'assert'.

import deepfind from '.'
import assert from 'assert'

const testSuite: ITestSuite[] = [
  ...
]

testSuite.forEach((t) => {
  describe(t.name, () => {
    it(t.name, () => {
      const r = deepfind(t.obj, t.cond)
      console.log(r)
      assert(t.expect(r))
    })
  })
})

I didn't write "expect to fail" tests, but I did test in semi-production, using real Webpack config.

I also put yarn test inside yarn prebuild; and I put yarn build inside yarn prepack.

I also had some experience with testing on Travis CI, but I didn't set it up this nice; which might be nice if I plan to "branch and merge".

See https://github.com/patarapolw/deepfind/blob/master/packages/deepfind/src/index.spec.ts