diff --git a/tests/unit-tests/security/transform/private-key.t.cpp b/tests/unit-tests/security/transform/private-key.t.cpp
index 539f3b1..6a6ba93 100644
--- a/tests/unit-tests/security/transform/private-key.t.cpp
+++ b/tests/unit-tests/security/transform/private-key.t.cpp
@@ -295,6 +295,7 @@
   PrivateKey sKey;
   sKey.loadPkcs1Base64(reinterpret_cast<const uint8_t*>(dataSet.privateKeyPkcs1.c_str()),
                        dataSet.privateKeyPkcs1.size());
+  BOOST_CHECK_EQUAL(sKey.getKeyType(), KeyType::RSA);
 
   const uint8_t plainText[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
 
@@ -320,10 +321,12 @@
   PublicKey pKey;
   pKey.loadPkcs8Base64(reinterpret_cast<const uint8_t*>(dataSet.publicKeyPkcs8.c_str()),
                        dataSet.publicKeyPkcs8.size());
+  BOOST_CHECK_EQUAL(pKey.getKeyType(), KeyType::RSA);
 
   PrivateKey sKey;
   sKey.loadPkcs1Base64(reinterpret_cast<const uint8_t*>(dataSet.privateKeyPkcs1.c_str()),
                        dataSet.privateKeyPkcs1.size());
+  BOOST_CHECK_EQUAL(sKey.getKeyType(), KeyType::RSA);
 
   const uint8_t plainText[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
 
@@ -340,6 +343,7 @@
   PrivateKey sKey;
   sKey.loadPkcs1Base64(reinterpret_cast<const uint8_t*>(dataSet.privateKeyPkcs1.c_str()),
                        dataSet.privateKeyPkcs1.size());
+  BOOST_CHECK_EQUAL(sKey.getKeyType(), KeyType::EC);
 
   OBufferStream os;
   bufferSource("Y2lhbyFob2xhIWhlbGxvIQ==") >> base64Decode() >> streamSink(os);
diff --git a/tests/unit-tests/security/transform/public-key.t.cpp b/tests/unit-tests/security/transform/public-key.t.cpp
index 41b0582..fee246f 100644
--- a/tests/unit-tests/security/transform/public-key.t.cpp
+++ b/tests/unit-tests/security/transform/public-key.t.cpp
@@ -114,6 +114,7 @@
   PublicKey pKey;
   pKey.loadPkcs8Base64(reinterpret_cast<const uint8_t*>(dataSet.publicKeyPkcs8.c_str()),
                        dataSet.publicKeyPkcs8.size());
+  BOOST_CHECK_EQUAL(pKey.getKeyType(), KeyType::EC);
 
   OBufferStream os;
   bufferSource("Y2lhbyFob2xhIWhlbGxvIQ==") >> base64Decode() >> streamSink(os);
diff --git a/tests/unit-tests/security/transform/signer-filter.t.cpp b/tests/unit-tests/security/transform/signer-filter.t.cpp
index f041e12..450f9ff 100644
--- a/tests/unit-tests/security/transform/signer-filter.t.cpp
+++ b/tests/unit-tests/security/transform/signer-filter.t.cpp
@@ -24,6 +24,7 @@
 #include "encoding/buffer-stream.hpp"
 #include "security/transform/base64-decode.hpp"
 #include "security/transform/buffer-source.hpp"
+#include "security/transform/private-key.hpp"
 #include "security/transform/stream-sink.hpp"
 #include "security/verification-helpers.hpp"
 
@@ -83,6 +84,8 @@
   PrivateKey sKey;
   sKey.loadPkcs1Base64(reinterpret_cast<const uint8_t*>(privateKeyPkcs1.data()), privateKeyPkcs1.size());
 
+  BOOST_CHECK_THROW(SignerFilter(DigestAlgorithm::NONE, sKey), Error);
+
   OBufferStream os2;
   bufferSource(data, sizeof(data)) >> signerFilter(DigestAlgorithm::SHA256, sKey) >> streamSink(os2);
   auto sig = os2.buf();
@@ -118,6 +121,8 @@
   PrivateKey sKey;
   sKey.loadPkcs1Base64(reinterpret_cast<const uint8_t*>(privateKeyPkcs1.data()), privateKeyPkcs1.size());
 
+  BOOST_CHECK_THROW(SignerFilter(DigestAlgorithm::NONE, sKey), Error);
+
   OBufferStream os2;
   bufferSource(data, sizeof(data)) >> signerFilter(DigestAlgorithm::SHA256, sKey) >> streamSink(os2);
   auto sig = os2.buf();
@@ -125,6 +130,12 @@
   BOOST_CHECK(verifySignature(data, sizeof(data), sig->buf(), sig->size(), pubKey->buf(), pubKey->size()));
 }
 
+BOOST_AUTO_TEST_CASE(InvalidKey)
+{
+  PrivateKey sKey;
+  BOOST_CHECK_THROW(SignerFilter(DigestAlgorithm::SHA256, sKey), Error);
+}
+
 BOOST_AUTO_TEST_SUITE_END() // TestSignerFilter
 BOOST_AUTO_TEST_SUITE_END() // Transform
 BOOST_AUTO_TEST_SUITE_END() // Security
diff --git a/tests/unit-tests/security/transform/verifier-filter.t.cpp b/tests/unit-tests/security/transform/verifier-filter.t.cpp
index 98a7c32..a877889 100644
--- a/tests/unit-tests/security/transform/verifier-filter.t.cpp
+++ b/tests/unit-tests/security/transform/verifier-filter.t.cpp
@@ -25,6 +25,7 @@
 #include "security/transform/base64-decode.hpp"
 #include "security/transform/bool-sink.hpp"
 #include "security/transform/buffer-source.hpp"
+#include "security/transform/private-key.hpp"
 #include "security/transform/signer-filter.hpp"
 #include "security/transform/stream-sink.hpp"