import { it, assert, assertEq } from 'folktest'
import { Union } from '../../src/union.js'

export const Tests = [
    it('should create a valid tagged union', () => {
        const union = Union(['Nothing', 'Void'])

        assert(Object.hasOwn(union, 'Nothing'))
        assert(Object.hasOwn(union, 'Void'))
    }),

    it('can be matched', () => {
        const union = Union(['Adrift', 'Nonextant', 'Dream'])
        const dreaming = union.Dream('mercury')
        const drifting = union.Adrift('19589')
        const gone = union.Nonextant('rowan', Infinity)

        dreaming.fold({
            Dream(name) {
                assertEq(name, 'mercury')
            }
        })

        drifting.fold({
            Adrift(name) {
                assertEq(name, '19589')
            }
        })

        gone.fold({
            Nonextant(name, when) {
                assertEq(name, 'rowan')
                assertEq(when, Infinity)
            }
        })
    })
]