Start adding tests

Makefile.am

@@ -6,4 +6,5 @@ EXTRA_DIST = \
 	autogen.sh
 
 SUBDIRS = \
-	src
+	src \
+	test

configure.ac

@@ -201,6 +201,7 @@ AC_CONFIG_FILES([Makefile
                  src/Makefile
                  src/libsodium/Makefile
                  src/libsodium/include/Makefile
-                 src/libsodium/include/sodium/version.h])
+                 src/libsodium/include/sodium/version.h
-
+                 test/Makefile
+                 ])
 AC_OUTPUT

test/Makefile.am

@@ -0,0 +1,18 @@
+
+AM_CPPFLAGS = \
+	-I. \
+	-I$(top_srcdir)/src/libsodium/include
+
+TESTS_TARGETS = \
+	test-randombytes
+
+check_PROGRAMS = $(TESTS_TARGETS)
+
+TESTS = $(TESTS_TARGETS)
+
+TESTS_LDADD = $(top_srcdir)/src/libsodium/libsodium.la
+
+test_randombytes_SOURCES = test-randombytes.c
+test_randombytes_LDADD   = $(TESTS_LDADD)
+
+verify: check

test/test-randombytes.c

@@ -0,0 +1,16 @@
+#include "sodium/randombytes.h"
+
+unsigned char x[65536];
+unsigned long long freq[256];
+
+int main(void)
+{
+  unsigned long long i;
+
+  randombytes(x,sizeof x);
+  for (i = 0;i < 256;++i) freq[i] = 0;
+  for (i = 0;i < sizeof x;++i) ++freq[255 & (int) x[i]];
+  for (i = 0;i < 256;++i) if (!freq[i]) return 111;
+
+  return 0;
+}