Node.js Package.json : Setting your test scripts runner

package.json

{
  "name": "Demo",
  "version": "0.0.0",
  "description": "description",
  "main": "app.js",
  "directories": {
    "test": "test"
  },
  "dependencies": {
  },
  "devDependencies": {
    "tap": "~0.3.3"
  },
  "scripts": {
    "test": "tap ./test"
  }
}

As you commented my question, the line in the scripts section should be: "test": "node tap ./test"

Why? "test": "tap ./test" works just fine.

@thomaswhite this is because npm runs the tests, rather than node itself.
You type in

npm test

So why does 'tap ./test' throw an error: 'Arguments to path.resolve must be strings'

But 'tap ./test/mytest.js' works just fine?

@darelf maybe the parser uses require(),
and your ./test directory neither contains a package.json nor has an index.js..?