Add Tests for fromFragment
Add Tests for fromFragment

Checks for basic Uri interactions; Create from None, Change from Another Fragment, and Dealing with null Strings.

reactormonk/http4s,ChristopherDavenport/http4s,ZizhengTai/http4s,reactormonk/http4s,reactormonk/http4s,rossabaker/http4s,rossabaker/http4s,ChristopherDavenport/http4s,ZizhengTai/http4s,aeons/http4s,ChristopherDavenport/http4s,ZizhengTai/http4s,aeons/http4s,aeons/http4s,http4s/http4s