diff --git a/libpldm/tests/libpldm_firmware_update_test.cpp b/libpldm/tests/libpldm_firmware_update_test.cpp
index 1e6bdb5..9ef53f7 100644
--- a/libpldm/tests/libpldm_firmware_update_test.cpp
+++ b/libpldm/tests/libpldm_firmware_update_test.cpp
@@ -2788,4 +2788,32 @@
         responseMsg, cancelUpdateComponentResponse.size() - hdrSize,
         &completionCode);
     EXPECT_EQ(rc, PLDM_ERROR_INVALID_LENGTH);
-}
\ No newline at end of file
+}
+
+TEST(CancelUpdate, goodPathEncodeRequest)
+{
+    constexpr uint8_t instanceId = 10;
+    std::array<uint8_t, hdrSize> request{};
+    auto requestMsg = reinterpret_cast<pldm_msg*>(request.data());
+
+    auto rc = encode_cancel_update_req(instanceId, requestMsg,
+                                       PLDM_CANCEL_UPDATE_REQ_BYTES);
+    EXPECT_EQ(rc, PLDM_SUCCESS);
+
+    constexpr std::array<uint8_t, hdrSize> outRequest{0x8A, 0x05, 0x1D};
+    EXPECT_EQ(request, outRequest);
+}
+
+TEST(CancelUpdate, errorPathEncodeRequest)
+{
+    std::array<uint8_t, hdrSize + sizeof(uint8_t)> request{};
+    auto requestMsg = reinterpret_cast<pldm_msg*>(request.data());
+
+    auto rc =
+        encode_cancel_update_req(0, nullptr, PLDM_CANCEL_UPDATE_REQ_BYTES);
+    EXPECT_EQ(rc, PLDM_ERROR_INVALID_DATA);
+
+    rc = encode_cancel_update_req(0, requestMsg,
+                                  PLDM_CANCEL_UPDATE_REQ_BYTES + 1);
+    EXPECT_EQ(rc, PLDM_ERROR_INVALID_LENGTH);
+}