Fix buffer overflow issue by changing how test string is created.
gfe-relnote: n/a. test only.
PiperOrigin-RevId: 275954569
Change-Id: I01c313eac723e643879602c768bda05575f46ae0
QUICHE (QUIC, Http/2, Etc) is Google‘s implementation of QUIC and related protocols. It powers Chromium as well as Google’s QUIC servers and some other projects.