import { it, assertEq } from 'folktest'
import { Some, None } from '../../src/option.js'
import { prove } from './monad.js'

const id = x => () => x
export const Tests = [
    it('some should pass monadic laws', () => {
        prove(
            Some,
            Some(1),
            1,
            x => Some(x + 1),
            x => Some(x * 2)
        )
    }),

    it('should not bind none', () => {
        const opt = Some(1)
            .bind(id(None))
            .bind(id(Some(1)))
            .map(x => x + 1)

        assertEq(opt, None)
    }),
]