diff --git a/fbpcs/emp_games/he_aggregation/test/HEAggGameTest.cpp b/fbpcs/emp_games/he_aggregation/test/HEAggGameTest.cpp
index 37434d738..41614a52e 100644
--- a/fbpcs/emp_games/he_aggregation/test/HEAggGameTest.cpp
+++ b/fbpcs/emp_games/he_aggregation/test/HEAggGameTest.cpp
@@ -29,6 +29,10 @@
 #include "fbpcs/emp_games/he_aggregation/HEAggGame.h"
 #include "fbpcs/emp_games/he_aggregation/HEAggOptions.h"
 
+#include "privacy_infra/elgamal/ElGamal.h"
+
+namespace heschme = facebook::privacy_infra::elgamal;
+
 namespace pcf2_he {
 
 std::unordered_map<uint64_t, uint64_t> runGame(
@@ -56,6 +60,52 @@ void verifyOutput(
       folly::toJson(actualOutput), folly::toJson(expectedOutput));
 }
 
+TEST(HEAggGameTest, HECiphertextAdditionTest) {
+  const std::string baseDir_ =
+      private_measurement::test_util::getBaseDirFromPath(__FILE__);
+
+  // Generate private key, public key and decryption table
+  auto sk = heschme::PrivateKey::generate();
+  auto pk = sk.toPublicKey();
+  heschme::initializeElGamalDecryptionTable(FLAGS_decryption_table_size);
+
+  // Encrypt values
+  int x = 111;
+  int y = 222;
+  heschme::Ciphertext c1 = pk.encrypt(x);
+  heschme::Ciphertext c2 = pk.encrypt(y);
+
+  // Perform addition
+  heschme::Ciphertext c3 = heschme::Ciphertext::add_with_ciphertext(c1, c2);
+
+  // Decrypt
+  uint64_t decrypted = sk.decrypt(c3);
+
+  EXPECT_EQ(decrypted, x + y);
+}
+TEST(HEAggGameTest, HEPlaintextAdditionTest) {
+  const std::string baseDir_ =
+      private_measurement::test_util::getBaseDirFromPath(__FILE__);
+
+  // Generate private key, public key and decryption table
+  auto sk = heschme::PrivateKey::generate();
+  auto pk = sk.toPublicKey();
+  heschme::initializeElGamalDecryptionTable(FLAGS_decryption_table_size);
+
+  // Encrypt values
+  int x = 111;
+  int y = 444;
+  heschme::Ciphertext c1 = pk.encrypt(x);
+
+  // Perform addition
+  heschme::Ciphertext c2 = heschme::Ciphertext::add_with_plaintext(c1, y);
+
+  // Decrypt
+  uint64_t decrypted = sk.decrypt(c2);
+
+  EXPECT_EQ(decrypted, x + y);
+}
+
 TEST(HEAggGameTest, HEAggGameCorrectnessTest) {
   const std::string baseDir_ =
       private_measurement::test_util::getBaseDirFromPath(__FILE__);