diff --git a/tests/unit-tests/security/transform/verifier-filter.t.cpp b/tests/unit-tests/security/transform/verifier-filter.t.cpp
index 4464c4e..217cf87 100644
--- a/tests/unit-tests/security/transform/verifier-filter.t.cpp
+++ b/tests/unit-tests/security/transform/verifier-filter.t.cpp
@@ -82,10 +82,10 @@
 
   OBufferStream os1;
   bufferSource(publicKeyPkcs8) >> base64Decode() >> streamSink(os1);
-  auto publicKeyBuffer = os1.buf();
+  auto pubKey = os1.buf();
 
   PublicKey pKey;
-  pKey.loadPkcs8(publicKeyBuffer->buf(), publicKeyBuffer->size());
+  pKey.loadPkcs8(pubKey->buf(), pubKey->size());
 
   PrivateKey sKey;
   sKey.loadPkcs1Base64(reinterpret_cast<const uint8_t*>(privateKeyPkcs1.data()), privateKeyPkcs1.size());
@@ -94,6 +94,8 @@
   bufferSource(data, sizeof(data)) >> signerFilter(DigestAlgorithm::SHA256, sKey) >> streamSink(os2);
   auto sig = os2.buf();
 
+  BOOST_CHECK_THROW(VerifierFilter(DigestAlgorithm::NONE, pKey, sig->buf(), sig->size()), Error);
+
   bool result = false;
   bufferSource(data, sizeof(data)) >>
     verifierFilter(DigestAlgorithm::SHA256, pKey, sig->buf(), sig->size()) >>
@@ -125,10 +127,10 @@
 
   OBufferStream os1;
   bufferSource(publicKeyPkcs8) >> base64Decode() >> streamSink(os1);
-  auto publicKeyBuffer = os1.buf();
+  auto pubKey = os1.buf();
 
   PublicKey pKey;
-  pKey.loadPkcs8(publicKeyBuffer->buf(), publicKeyBuffer->size());
+  pKey.loadPkcs8(pubKey->buf(), pubKey->size());
 
   PrivateKey sKey;
   sKey.loadPkcs1Base64(reinterpret_cast<const uint8_t*>(privateKeyPkcs1.data()), privateKeyPkcs1.size());
@@ -137,6 +139,8 @@
   bufferSource(data, sizeof(data)) >> signerFilter(DigestAlgorithm::SHA256, sKey) >> streamSink(os2);
   auto sig = os2.buf();
 
+  BOOST_CHECK_THROW(VerifierFilter(DigestAlgorithm::NONE, pKey, sig->buf(), sig->size()), Error);
+
   bool result = false;
   bufferSource(data, sizeof(data)) >>
     verifierFilter(DigestAlgorithm::SHA256, pKey, sig->buf(), sig->size()) >>
@@ -145,6 +149,12 @@
   BOOST_CHECK_EQUAL(result, true);
 }
 
+BOOST_AUTO_TEST_CASE(InvalidKey)
+{
+  PublicKey pKey;
+  BOOST_CHECK_THROW(VerifierFilter(DigestAlgorithm::SHA256, pKey, nullptr, 0), Error);
+}
+
 BOOST_AUTO_TEST_SUITE_END() // TestVerifierFilter
 BOOST_AUTO_TEST_SUITE_END() // Transform
 BOOST_AUTO_TEST_SUITE_END() // Security