import { iterate, Vector2 } from '../KochSnowflake'

describe('KochSnowflake', () => {
  it('should produce the correctly-transformed vectors', () => {
    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[0]).toEqual({
      x: 0,
      y: 0
    })

    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[1]).toEqual({
      x: 1 / 3,
      y: 0
    })

    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[2]).toEqual({
      x: 1 / 2,
      y: Math.sin(Math.PI / 3) / 3
    })

    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[3]).toEqual({
      x: 2 / 3,
      y: 0
    })

    expect(iterate([new Vector2(0, 0), new Vector2(1, 0)], 1)[4]).toEqual({
      x: 1,
      y: 0
    })
  })
})