import { describe, it, expect } from 'vitest'
import { DEFAULT_STATE_LABELS } from './labels'

const { errorMessage } = DEFAULT_STATE_LABELS

describe('DEFAULT_STATE_LABELS.errorMessage', () => {
  it('returns Error.message for Error instances', () => {
    expect(errorMessage(new Error('boom'))).toBe('boom')
  })

  it('returns the string verbatim when given a string', () => {
    expect(errorMessage('plain text')).toBe('plain text')
  })

  it('coerces objects with a message field to that message', () => {
    expect(errorMessage({ message: 'custom-msg' })).toBe('custom-msg')
    // Non-string message coerces via String()
    expect(errorMessage({ message: 42 })).toBe('42')
  })

  it('falls back to "Unknown error" for unknown shapes', () => {
    expect(errorMessage(42)).toBe('Unknown error')
    expect(errorMessage(null)).toBe('Unknown error')
    expect(errorMessage(undefined)).toBe('Unknown error')
    expect(errorMessage({ no: 'message-field' })).toBe('Unknown error')
  })

  it('exposes the default labels as plain strings', () => {
    expect(DEFAULT_STATE_LABELS.errorTitle).toBe('Something went wrong')
    expect(DEFAULT_STATE_LABELS.emptyTitle).toBe('No data')
    expect(typeof DEFAULT_STATE_LABELS.emptyDescription).toBe('string')
  })
})