diff --git a/test/index.js b/test/index.js
index c56ef71..2f0985f 100644
--- a/test/index.js
+++ b/test/index.js
@@ -29,6 +29,13 @@ test ('random_hex should refuse lenght smaller 1', (t) => {
   t.is(error.message, 'invalid length');
 });
 
+test ('random_hex should always return correct length', (t)=>{
+  for (let i = 1; i < 32; i++) {
+    const hex = crypto.random_hex (i);
+    t.is (hex.length, i);
+  }
+});
+
 test ('random_string', (t) => {
   const str = crypto.random_string (16);
   t.is (str.length, 16);
@@ -46,6 +53,14 @@ test ('random_string should refuse lenght smaller 1', (t) => {
   t.is(error.message, 'invalid length');
 });
 
+test ('random_string should always return correct length', (t)=>{
+  for (let i = 1; i < 32; i++) {
+    const str = crypto.random_string (i);
+    t.is (str.length, i);
+  }
+});
+
+
 test ('hash_sha512', (t) => {
   const hash = crypto.hash_sha512 ('a', 'b');
   t.is (