[hack] More Buffered Line Reader Tests
[hack] More Buffered Line Reader Tests

Summary: More robust tests cutting up the appearance of newlines across writes.

Reviewed By: gregory-nisbet

Differential Revision: D7347440

fbshipit-source-id: 632a2b9cfb41ddf4a23caab78ac95921ef75dd27

JonathanUsername/flow,jamesgpearce/flow,AgentME/flow,AgentME/flow,popham/flow,samwgoldman/flow,jamesgpearce/flow,claudiopro/flow,gabelevi/flow,JonathanUsername/flow,gabelevi/flow,popham/flow,claudiopro/flow,popham/flow,nmote/flow,nmote/flow,claudiopro/flow,JonathanUsername/flow,gabelevi/flow,jamesgpearce/flow,nmote/flow,popham/flow,gabelevi/flow,gabelevi/flow,facebook/flow,samwgoldman/flow,facebook/flow,AgentME/flow,jamesgpearce/flow,popham/flow,claudiopro/flow,gabelevi/flow,nmote/flow,nmote/flow,samwgoldman/flow,jamesgpearce/flow,facebook/flow,samwgoldman/flow,mroch/flow,facebook/flow,facebook/flow,JonathanUsername/flow,mroch/flow,JonathanUsername/flow,popham/flow,JonathanUsername/flow,mroch/flow,jamesgpearce/flow,popham/flow,gabelevi/flow,mroch/flow,JonathanUsername/flow,nmote/flow,AgentME/flow,nmote/flow,mroch/flow,facebook/flow,mroch/flow,AgentME/flow,samwgoldman/flow,claudiopro/flow,samwgoldman/flow,jamesgpearce/flow,mroch/flow,samwgoldman/flow,facebook/flow