hugolib: Add more summary test
hugolib: Add more summary test

Closes #2973

gohugoio/hugo,fedelibre/hugo,gohugoio/hugo,mdhender/hugo,fedelibre/hugo,mdhender/hugo,anthonyfok/hugo,anthonyfok/hugo,mdhender/hugo,mdhender/hugo,anthonyfok/hugo,gohugoio/hugo,fedelibre/hugo,fedelibre/hugo