describe('cp.diff', function()
  local diff = require('cp.diff')

  describe('get_available_backends', function()
    it('returns vim and git backends')
  end)

  describe('get_backend', function()
    it('returns vim backend by name')
    it('returns git backend by name')
    it('returns nil for invalid name')
  end)

  describe('is_git_available', function()
    it('returns true when git command succeeds')
    it('returns false when git command fails')
  end)

  describe('get_best_backend', function()
    it('returns preferred backend when available')
    it('falls back to vim when git unavailable')
    it('defaults to vim backend')
  end)

  describe('vim backend', function()
    it('returns content as-is')
    it('returns nil highlights')
  end)

  describe('git backend', function()
    it('creates temp files for diff')
    it('returns raw diff output')
    it('cleans up temp files')
    it('handles no differences')
    it('handles git command failure')
  end)

  describe('render_diff', function()
    it('uses best available backend')
    it('passes parameters to backend')
  end)
end)