diff --git a/test/encryption.js b/test/encryption.js
index 5d54511..6a36b51 100644
--- a/test/encryption.js
+++ b/test/encryption.js
@@ -16,6 +16,29 @@ test ('decryption', (t) => {
   t.is (dec, 'foo');
 });
 
+test ('encryption 128', (t) => {
+  const enc = crypto.encrypt_aes (
+    'foo',
+    'bar',
+    crypto.encryption_mode_cbc_128,
+  );
+  t.is (typeof enc, 'string');
+});
+
+test ('decryption 128', (t) => {
+  const enc = crypto.encrypt_aes (
+    'foo',
+    'bar',
+    crypto.encryption_mode_cbc_128,
+  );
+  const dec = crypto.decrypt_aes (
+    enc,
+    'bar',
+    crypto.encryption_mode_cbc_128,
+  );
+  t.is (dec, 'foo');
+});
+
 test ('fail decryption', (t) => {
   const enc = crypto.encrypt_aes ('foo', 'bar');
   const dec = crypto.decrypt_aes (enc, 'baz');