Add extra assert() in tests allocating memory on the heap.

test/default/pwhash.c

@@ -267,8 +267,10 @@ static void tv3(void)
 
     do {
         out = (char *) sodium_malloc(strlen(tests[i].out) + 1U);
+        assert(out != NULL);
         memcpy(out, tests[i].out, strlen(tests[i].out) + 1U);
         passwd = (char *) sodium_malloc(strlen(tests[i].passwd) + 1U);
+        assert(passwd != NULL);
         memcpy(passwd, tests[i].passwd, strlen(tests[i].passwd) + 1U);
         if (crypto_pwhash_scryptsalsa208sha256_str_verify(
                 out, passwd, strlen(passwd)) != 0) {

test/default/sodium_utils2.c

@@ -48,6 +48,7 @@ int main(void)
     for (i = 0U; i < 10000U; i++) {
         size = randombytes_uniform(100000U);
         buf = sodium_malloc(size);
+        assert(buf != NULL);
         memset(buf, i, size);
         sodium_mprotect_readonly(buf);
         sodium_free(buf);
@@ -65,6 +66,7 @@ int main(void)
 #endif
     size = randombytes_uniform(100000U);
     buf = sodium_malloc(size);
+    assert(buf != NULL);
     sodium_mprotect_readonly(buf);
     sodium_mprotect_readwrite(buf);
 #ifndef __EMSCRIPTEN__

test/default/sodium_utils3.c

@@ -43,6 +43,7 @@ int main(void)
 #endif
     size = randombytes_uniform(100000U);
     buf = sodium_malloc(size);
+    assert(buf != NULL);
     sodium_mprotect_noaccess(buf);
     sodium_mprotect_readwrite(buf);
 #ifndef __EMSCRIPTEN__