ui-tui/src/lib/text.test.ts

import { describe, expect, it } from 'vitest'

import { stripTrailingPasteNewlines } from './text.js'

describe('stripTrailingPasteNewlines', () => {
  it('removes trailing newline runs from pasted text', () => {
    expect(stripTrailingPasteNewlines('alpha\n')).toBe('alpha')
    expect(stripTrailingPasteNewlines('alpha\nbeta\n\n')).toBe('alpha\nbeta')
  })

  it('preserves interior newlines', () => {
    expect(stripTrailingPasteNewlines('alpha\nbeta\ngamma')).toBe('alpha\nbeta\ngamma')
  })

  it('preserves newline-only pastes', () => {
    expect(stripTrailingPasteNewlines('\n\n')).toBe('\n\n')
  })
})