vue2/test/unit/modules/server-compiler/compiler-options.spec.ts

import { ssrCompile } from 'server/compiler'

describe('ssrCompile options', () => {
  it('comments', () => {
    const compiled = ssrCompile(
      `
      <div>
        <!-- test comments -->
      </div>
    `,
      { comments: true }
    )

    expect(compiled.render).toContain('<!-- test comments -->')
  })
})