describe('These fold', () => {
  it('folds left', () => {
    const result = toString(Th.left('error'))
    expect(result).toBe('Error: error')
  })

  it('folds right', () => {
    const result = toString(Th.right(42))
    expect(result).toBe('Value: 42')
  })

  it('folds both', () => {
    const result = toString(Th.both('warning', 42))
    expect(result).toBe('Warning: warning, Value: 42')
  })

  it('gets value from right', () => {
    const result = getValue(Th.right(42), 0)
    expect(result).toBe(42)
  })

  it('gets default from left', () => {
    const result = getValue(Th.left('error'), 0)
    expect(result).toBe(0)
  })

  it('gets value from both', () => {
    const result = getValue(Th.both('warning', 42), 0)
    expect(result).toBe(42)
  })
})