two-bucket.test.ts

import { describe, xdescribe, it, expect, xit } from '@jest/globals'
import { TwoBucket } from './two-bucket.ts'

describe('TwoBucket', () => {
  describe('Measure using bucket one of size 3 and bucket two of size 5', () => {
    const buckOne = 3
    const buckTwo = 5
    const goal = 1

    it('start with bucket one', () => {
      // indicates which bucket to fill first
      const starterBuck = 'one'
      const twoBucket = new TwoBucket(buckOne, buckTwo, goal, starterBuck)
      // includes the first fill
      expect(twoBucket.moves()).toEqual(4)
      // which bucket should end up with the desired # of liters
      expect(twoBucket.goalBucket).toEqual('one')
      // leftover value in the "other" bucket once the goal has been reached
      expect(twoBucket.otherBucket).toEqual(5)
    })

    xit('start with bucket two', () => {
      const starterBuck = 'two'
      const twoBucket = new TwoBucket(buckOne, buckTwo, goal, starterBuck)
      expect(twoBucket.moves()).toEqual(8)
      expect(twoBucket.goalBucket).toEqual('two')
      expect(twoBucket.otherBucket).toEqual(3)
    })
  })

  xdescribe('Measure using bucket one of size 7 and bucket two of size 11', () => {
    const buckOne = 7
    const buckTwo = 11
    const goal = 2

    xit('start with bucket one', () => {
      const starterBuck = 'one'
      const twoBucket = new TwoBucket(buckOne, buckTwo, goal, starterBuck)
      expect(twoBucket.moves()).toEqual(14)
      expect(twoBucket.goalBucket).toEqual('one')
      expect(twoBucket.otherBucket).toEqual(11)
    })

    xit('start with bucket two', () => {
      const starterBuck = 'two'
      const twoBucket = new TwoBucket(buckOne, buckTwo, goal, starterBuck)
      expect(twoBucket.moves()).toEqual(18)
      expect(twoBucket.goalBucket).toEqual('two')
      expect(twoBucket.otherBucket).toEqual(7)
    })
  })

  xdescribe('Measure one step using bucket one of size 1 and bucket two of size 3', () => {
    xit('start with bucket two', () => {
      const twoBucket = new TwoBucket(1, 3, 3, 'two')
      expect(twoBucket.moves()).toEqual(1)
      expect(twoBucket.goalBucket).toEqual('two')
      expect(twoBucket.otherBucket).toEqual(0)
    })
  })

  xdescribe('Measure using bucket one of size 2 and bucket two of size 3', () => {
    xit('start with bucket one and end with bucket two', () => {
      const twoBucket = new TwoBucket(2, 3, 3, 'one')
      expect(twoBucket.moves()).toEqual(2)
      expect(twoBucket.goalBucket).toEqual('two')
      expect(twoBucket.otherBucket).toEqual(2)
    })
  })

  xdescribe('Reachability', () => {
    const buckOne = 6
    const buckTwo = 15
    const starterBuck = 'one'

    xit('Not possible to reach the goal', () => {
      const goal = 5
      const twoBucket = new TwoBucket(buckOne, buckTwo, goal, starterBuck)
      expect(() => twoBucket.moves()).toThrow()
    })

    xit('With the same buckets but a different goal, then it is possible', () => {
      const goal = 9
      const twoBucket = new TwoBucket(buckOne, buckTwo, goal, starterBuck)
      expect(twoBucket.moves()).toEqual(10)
      expect(twoBucket.goalBucket).toEqual('two')
      expect(twoBucket.otherBucket).toEqual(0)
    })
  })

  xdescribe('Goal larger than both buckets', () => {
    xit('Is impossible', () => {
      const twoBucket = new TwoBucket(5, 7, 8, 'one')
      expect(() => twoBucket.moves()).toThrow()
    })
  })
})