Add tests for get_random_bytes.

It turns out not to be *that* hard to exercise the fallback logic in
get_random_bytes, thanks to GNU ld's --wrap feature.  There is also
some basic black-box testing of the get_random_bytes interface.

The change to randombytes.c itself ensures 100% predictable behavior
if get_random_bytes should ever be called with buflen zero.

1 files changed, 2 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
index 16488f3..06ee727 100644
--- a/.gitignore
+++ b/.gitignore
@@ -68,6 +68,8 @@
 /test-des-obsolete
 /test-des-obsolete_r
 /test-gensalt
+/test-getrandom-fallbacks
+/test-getrandom-interface
 /test-short-outbuf
 
 # backup-files