Process review comments on test_encrypt_short_tag

tests/test_aesgcmstream.py

@@ -32,6 +32,7 @@ if _lib.AESGCM_STREAM_ENABLED:
     from wolfcrypt.ciphers import AesGcmStream
 
     def test_encrypt():
+        """Known answer encrypt-decrypt test with default authentication tag size of 16 bytes"""
         key = "fedcba9876543210"
         iv = "0123456789abcdef"
         gcm = AesGcmStream(key, iv)
@@ -44,7 +45,9 @@ if _lib.AESGCM_STREAM_ENABLED:
         gcmdec.final(authTag)
         assert bufdec == t2b("hello world")
 
+    @pytest.mark.skipif(12 < _lib.MIN_AUTH_TAG_SZ, reason="test can only be performed when MIN_AUTH_TAG_SZ is larger than 12")
     def test_encrypt_short_tag():
+        """Known answer encrypt-decrypt test with specific authentication tag size of 12 bytes"""
         key = "fedcba9876543210"
         iv = "0123456789abcdef"
         gcm = AesGcmStream(key, iv, 12)