Add test.each() to support BDD

This will help to support usage such as:

test.beforeEach(t => {
  t.context.game = new Game()
})

test.each(
[
  { c1: 1, c2: 2, dir: 'west' },
  { c1: 2, c2: 3, dir: 'south' },
  { c1: 3, c2: 4, dir: 'east' },
  { c1: 4, c2: 5, dir: 'north' }
], t => {
  const { game, c1, c2, dir } = t.context
  game.createAndConnectCaverns(c1, c2, dir)
  const p = game.createPlayerIn(c1)
  p.move(dir)
  t.is(p.location, c2)
})

[novemberborn]

Interesting. This is currently possible using macros:

const playerIsAtLocation = (t, c1, c2, dir) => {
  const { game } = t.context
  const p = game.createPlayerIn(c1)
  p.move(dir)
  t.is(p.location, c2)
}

for (const {c1, c2, dir} of [
  { c1: 1, c2: 2, dir: 'west' },
  { c1: 2, c2: 3, dir: 'south' },
  { c1: 3, c2: 4, dir: 'east' },
  { c1: 4, c2: 5, dir: 'north' }
]) {
  test(playerIsAtLocation, c1, c2, dir)
}

There’s something nice about your test.each() suggestion but I’m not sure it’s worth the maintenance cost.

[selenium-tester]

Apologies for joining a dead thread; I came looking through the issues for any other discussions about parameterized/data-driven test support in Ava. I found lots of discussion in various tickets, but this seemed the most recent and most directly related to my search so I wanted to add an extra voice to the conversation.

The current macro capability is great, but I do agree it would be even nicer if we could just insert parameters into the test function directly as @unional described. I’ve seen several examples of something similar done for Mocha to simplify its dynamic tests:

https://github.com/mikejsdev/mocha-param

And for QUnit:

https://github.com/AStepaniuk/qunit-parameterize

And another more generic library for multiple test frameworks:

https://github.com/lawrencec/Unroll/blob/master/examples/ava/ava-example.js

And one going in a different direction to emulate TestNG decorators:

https://github.com/alsatian-test/alsatian

It’s definitely a common use case for easier test design. As you said, you’ve provided other ways to accomplish this so maybe we don’t strictly need it, but it would be a very nice to have.

In any event, thank you again for all the great work done on Ava.