maju/test.spec.ts at master · romaindurand/maju · GitHub

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import { describe, it, expect } from 'vitest'
import createPoll from './index'

describe('maju', () => {
  it('exported function should return an object', () => {
    const poll = createPoll(['test'])
    expect(typeof poll).toBe('object')
  })

  it('demo test', () => {
    const poll = createPoll(['Matrix', 'Terminator', 'Stargate', 'Ghostbusters'])
    poll.addVotes([
      { Matrix: 5, Stargate: 1, Ghostbusters: 2, Terminator: 1 },
      { Matrix: 1, Stargate: 3, Ghostbusters: 3, Terminator: 3 },
      { Matrix: 2, Stargate: 3, Ghostbusters: 5, Terminator: 5 },
      { Matrix: 3, Stargate: 0, Ghostbusters: 3, Terminator: 3 },
    ]);
    expect(poll.getWinner().length).toBe(1)
    expect(poll.getWinner()[0]).toBe('Ghostbusters')
  })

  it('tie vote', () => {
    const poll = createPoll(['a', 'b', 'c', 'd'])
    poll.addVotes([
      { a: 3, b: 4, c: 3, d: 1 },
      { a: 4, b: 3, c: 1, d: 3 },
      { a: 2, b: 2, c: 2, d: 2 },
    ])
    const winner = poll.getWinner()
    const results = poll.getResults()
    expect(results[0].rank).toBe(0)
    expect(results[1].rank).toBe(0)
    expect(results[2].rank).toBe(1)
    expect(results[3].rank).toBe(1)
    expect(winner).toEqual(['a', 'b'])
  })

  describe('getResults', () => {
    it('should return empty array when no votes have been cast', () => {
      const poll = createPoll(['Option A', 'Option B'])
      const results = poll.getResults()

      expect(results).toHaveLength(2)
      expect(results[0]).toEqual({
        rank: 0,
        name: 'Option A',
        medianGrade: 0,
        distribution: [
          { count: 0, percentage: 0 },
          { count: 0, percentage: 0 },
          { count: 0, percentage: 0 },
          { count: 0, percentage: 0 },
          { count: 0, percentage: 0 },
          { count: 0, percentage: 0 },
        ],
      })
    })

    it('should calculate correct results for a single vote', () => {
      const poll = createPoll(['Option A', 'Option B'])
      poll.addVotes([{ 'Option A': 5, 'Option B': 2 }])
      const results = poll.getResults()

      expect(results).toHaveLength(2)
      expect(results[0].name).toBe('Option A')
      expect(results[0].distribution.map(d => d.count)).toEqual([0, 0, 0, 0, 0, 1])
      expect(results[0].distribution.map(d => d.percentage)).toEqual([0, 0, 0, 0, 0, 1])
      expect(results[0].medianGrade).toBe(5)

      expect(results[1].name).toBe('Option B')
      expect(results[1].distribution.map(d => d.count)).toEqual([0, 0, 1, 0, 0, 0])
      expect(results[1].distribution.map(d => d.percentage)).toEqual([0, 0, 1, 0, 0, 0])
      expect(results[1].medianGrade).toBe(2)
    })

    it('should calculate correct scoreRatio with multiple votes', () => {
      const poll = createPoll(['Option A', 'Option B'])
      poll.addVotes([{ 'Option A': 5, 'Option B': 2 }])
      poll.addVotes([{ 'Option A': 4, 'Option B': 3 }])
      poll.addVotes([{ 'Option A': 5, 'Option B': 1 }])
      poll.addVotes([{ 'Option A': 3, 'Option B': 2 }])
      const results = poll.getResults()

      expect(results[0].name).toBe('Option A')
      expect(results[0].distribution.map(d => d.count)).toEqual([0, 0, 0, 1, 1, 2])
      expect(results[0].distribution.map(d => d.percentage)).toEqual([0, 0, 0, 0.25, 0.25, 0.5])

      expect(results[1].name).toBe('Option B')
      expect(results[1].distribution.map(d => d.count)).toEqual([0, 1, 2, 1, 0, 0])
      expect(results[1].distribution.map(d => d.percentage)).toEqual([0, 0.25, 0.5, 0.25, 0, 0])
    })

    it('should assign correct ranks to all options', () => {
      const poll = createPoll(['Option A', 'Option B', 'Option C'])
      poll.addVotes([{ 'Option A': 5, 'Option B': 3, 'Option C': 1 }])
      const results = poll.getResults()

      expect(results[0].rank).toBe(0)
      expect(results[1].rank).toBe(1)
      expect(results[2].rank).toBe(2)
    })

    it('should calculate median grade correctly', () => {
      const poll = createPoll(['Option A'])
      poll.addVotes([{ 'Option A': 5 }])
      poll.addVotes([{ 'Option A': 4 }])
      poll.addVotes([{ 'Option A': 3 }])
      poll.addVotes([{ 'Option A': 2 }])
      poll.addVotes([{ 'Option A': 1 }])
      const results = poll.getResults()

      // With 5 votes, median should be the 3rd value (index 2) when sorted
      expect(results[0].medianGrade).toBe(3)
    })

    it('should work with the demo test data', () => {
      const poll = createPoll(['Matrix', 'Terminator', 'Stargate', 'Ghostbusters'])
      poll.addVotes([{ Matrix: 5, Stargate: 1, Ghostbusters: 0, Terminator: 1 }])
      poll.addVotes([{ Matrix: 1, Stargate: 3, Ghostbusters: 1, Terminator: 0 }])
      poll.addVotes([{ Matrix: 2, Stargate: 3, Ghostbusters: 5, Terminator: 3 }])
      poll.addVotes([{ Matrix: 3, Stargate: 0, Ghostbusters: 3, Terminator: 5 }])
      poll.addVotes([{ Matrix: 5, Stargate: 2, Ghostbusters: 4, Terminator: 2 }])
      poll.addVotes([{ Matrix: 4, Stargate: 3, Ghostbusters: 5, Terminator: 0 }])
      poll.addVotes([{ Matrix: 1, Stargate: 3, Ghostbusters: 5, Terminator: 4 }])
      poll.addVotes([{ Matrix: 1, Stargate: 0, Ghostbusters: 3, Terminator: 5 }])
      poll.addVotes([{ Matrix: 5, Stargate: 1, Ghostbusters: 1, Terminator: 3 }])
      poll.addVotes([{ Matrix: 3, Stargate: 4, Ghostbusters: 2, Terminator: 4 }])
      poll.addVotes([{ Matrix: 2, Stargate: 3, Ghostbusters: 4, Terminator: 3 }])
      poll.addVotes([{ Matrix: 4, Stargate: 5, Ghostbusters: 3, Terminator: 5 }])

      const results = poll.getResults()

      expect(results).toHaveLength(4)
      expect(results.every(r => r.rank >= 0 && r.rank <= 3)).toBe(true)
      expect(results.every(r => r.distribution.length === 6)).toBe(true)
      expect(results.every(r => r.medianGrade >= 0 && r.medianGrade <= 5)).toBe(true)
    })

    it('should handle different GRADING_LEVELS configuration', () => {
      const poll = createPoll(['Option A', 'Option B'], { GRADING_LEVELS: 4 })
      poll.addVotes([{ 'Option A': 3, 'Option B': 1 }])
      poll.addVotes([{ 'Option A': 2, 'Option B': 0 }])
      const results = poll.getResults()

      expect(results[0].distribution).toHaveLength(4)
      expect(results[1].distribution).toHaveLength(4)
    })

    it('should use addVotes method correctly', () => {
      const poll = createPoll(['Option A', 'Option B'])
      poll.addVotes([
        { 'Option A': 5, 'Option B': 2 },
        { 'Option A': 4, 'Option B': 3 }
      ])
      const results = poll.getResults()

      expect(results).toHaveLength(2)
      expect(results[0].distribution.map(d => d.count)).toEqual([0, 0, 0, 0, 1, 1])
      expect(results[1].distribution.map(d => d.count)).toEqual([0, 0, 1, 1, 0, 0])
    })

    it('should handle all votes with same score', () => {
      const poll = createPoll(['Option A'])
      poll.addVotes([{ 'Option A': 3 }])
      poll.addVotes([{ 'Option A': 3 }])
      poll.addVotes([{ 'Option A': 3 }])
      const results = poll.getResults()

      expect(results[0].distribution.map(d => d.count)).toEqual([0, 0, 0, 3, 0, 0])
      expect(results[0].distribution.map(d => d.percentage)).toEqual([0, 0, 0, 1, 0, 0])
      expect(results[0].medianGrade).toBe(3)
    })
    it('should assign the same rank to tied candidates', () => {
      const poll = createPoll(['Option A', 'Option B']);
      poll.addVotes([
        { 'Option A': 3, 'Option B': 3 },
        { 'Option A': 4, 'Option B': 4 }
      ]);
      const results = poll.getResults();

      expect(results[0].rank).toBe(results[1].rank);
      expect(results[0].rank).toBe(0);
      expect(results[1].rank).toBe(0);
    });
  })
})