diff --git a/tests/responder.cpp b/tests/responder.cpp
new file mode 100644
index 0000000..6a0a3fd
--- /dev/null
+++ b/tests/responder.cpp
@@ -0,0 +1,88 @@
+// NOLINTNEXTLINE(bugprone-suspicious-include)
+#include "responder.c"
+
+#include <gtest/gtest.h>
+
+TEST(Responder, track_untrack_one)
+{
+    struct pldm_responder_cookie jar
+    {
+    };
+    struct pldm_responder_cookie cookie = {
+        .tid = 1,
+        .instance_id = 1,
+        .type = 0,
+        .command = 0x01, /* SetTID */
+        .next = nullptr,
+    };
+
+    ASSERT_EQ(pldm_responder_cookie_track(&jar, &cookie), 0);
+    ASSERT_NE(jar.next, nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 1, 1, 0, 0x01), &cookie);
+    ASSERT_EQ(jar.next, nullptr);
+}
+
+TEST(Responder, untrack_none)
+{
+    struct pldm_responder_cookie jar
+    {
+    };
+
+    ASSERT_EQ(jar.next, nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 1, 1, 0, 0x01), nullptr);
+    ASSERT_EQ(jar.next, nullptr);
+}
+
+TEST(Responder, track_one_untrack_bad)
+{
+    struct pldm_responder_cookie jar
+    {
+    };
+    struct pldm_responder_cookie cookie = {
+        .tid = 1,
+        .instance_id = 1,
+        .type = 0,
+        .command = 0x01, /* SetTID */
+        .next = nullptr,
+    };
+
+    ASSERT_EQ(pldm_responder_cookie_track(&jar, &cookie), 0);
+    ASSERT_NE(jar.next, nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 2, 1, 0, 0x01), nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 1, 2, 0, 0x01), nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 1, 1, 1, 0x01), nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 1, 1, 0, 0x02), nullptr);
+    ASSERT_NE(jar.next, nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 1, 1, 0, 0x01), &cookie);
+    ASSERT_EQ(jar.next, nullptr);
+}
+
+TEST(Responder, track_untrack_two)
+{
+    struct pldm_responder_cookie jar
+    {
+    };
+    struct pldm_responder_cookie cookies[] = {
+        {
+            .tid = 1,
+            .instance_id = 1,
+            .type = 0,
+            .command = 0x01, /* SetTID */
+            .next = nullptr,
+        },
+        {
+            .tid = 2,
+            .instance_id = 1,
+            .type = 0,
+            .command = 0x01, /* SetTID */
+            .next = nullptr,
+        },
+    };
+
+    ASSERT_EQ(pldm_responder_cookie_track(&jar, &cookies[0]), 0);
+    ASSERT_EQ(pldm_responder_cookie_track(&jar, &cookies[1]), 0);
+    ASSERT_NE(jar.next, nullptr);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 2, 1, 0, 0x01), &cookies[1]);
+    ASSERT_EQ(pldm_responder_cookie_untrack(&jar, 1, 1, 0, 0x01), &cookies[0]);
+    ASSERT_EQ(jar.next, nullptr);
+}