text: import Fretboard from './index'
  
  const tuning = ['E2', 'A2', 'D3', 'G3', 'B3', 'E4']
  
  it('should be defined', () => {
      expect(Fretboard).toBeDefined()
  })
  
  it('should be a function', () => {
      expect(typeof Fretboard).toBe('function')
  })
  
  it('should be a constructor', () => {
      const fretboard = new Fretboard(tuning, 12)
      expect(fretboard instanceof Fretboard).toBe(true)
  })
  
  describe('positions', () => {
      let fretboard
  
      beforeEach(() => {
          fretboard = new Fretboard(tuning, 12)
      })
  
      it('should be defined', () => {
          expect(fretboard.positions).toBeDefined()
      })
  
      it('should return an array', () => {
          expect(Array.isArray(fretboard.positions)).toBe(true)
      })
  })
  
  describe('at', () => {
      let fretboard
  
      beforeEach(() => {
          fretboard = new Fretboard(tuning, 12)
      })
  
      it('should be defined', () => {
          expect(fretboard.at).toBeDefined()
      })
  
      it('should be a function', () => {
          expect(typeof fretboard.at).toBe('function')
      })
  
      it('should return a pitch', () => {
          expect(fretboard.at(0, 0).constructor.name).toBe('Pitch')
      })
  
      it('should return correct pitch at open strings', () => {
          expect(tuning.reverse().every((value, index) => fretboard.at(index, 0).equals(value))).toBe(
              true
          )
      })
  })
  