diff --git a/unit_test/crypto/crypto_test.cpp b/unit_test/crypto/crypto_test.cpp
new file mode 100644
index 0000000..6455b18
--- /dev/null
+++ b/unit_test/crypto/crypto_test.cpp
@@ -0,0 +1,41 @@
+//
+// Created by dongwenzhe on 2023/3/14.
+//
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "crypto.h"
+
+TEST_SUITE("Crypto functions") {
+    TEST_CASE("BASE64") {
+        auto       *pSrc = (unsigned char *)"HELLOWORLD";
+        const char *encode;
+
+        encode = base64_encode(pSrc, 16);
+        INFO("BASE64_ENCODING:", encode);
+
+        unsigned char *decode;
+        unsigned int outputSize = 0;
+        decode = base64_decode(encode, &outputSize);
+        INFO("BASE64_DECODING:", decode);
+
+        for(int i = 0; i<outputSize; i++) {
+            CHECK_EQ(decode[i], pSrc[i]);
+        }
+    }
+
+    TEST_CASE("AES") {
+        AES_TYPE algoType = DES3_CBC_PKCS7PADDING;
+        const char  *data = "hello world";
+        const char  *key  = "NmmW4zO4FCrhpugLaoBgjA==";
+        unsigned char *out;
+        unsigned char *res;
+        int outputSize = 0;
+        int resSize    = 0;
+
+        symmetric_encrypto(algoType, (unsigned char *)data, strlen(data), &out, &outputSize, key);
+        CHECK_NE(out, nullptr);
+        symmetric_decrypto(algoType, out, outputSize, &res, &resSize, key);
+        CHECK_NE(res, nullptr);
+        REQUIRE_MESSAGE((strlen(data) == resSize), "the decrypted message:", res);
+    }
+}
diff --git a/unit_test/s2j/s2j_test.cpp b/unit_test/s2j/s2j_test.cpp
new file mode 100644
index 0000000..2e8cc5e
--- /dev/null
+++ b/unit_test/s2j/s2j_test.cpp
@@ -0,0 +1,54 @@
+//
+// Created by dongwenzhe on 2023/3/17.
+//
+#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
+#include "doctest.h"
+#include "s2j/s2j.h"
+
+typedef struct {
+    char info[16];
+} Message;
+
+typedef struct {
+    int id;
+    char name[16];
+    Message msg;
+} Service;
+
+TEST_SUITE("S2J_TEST") {
+    TEST_CASE("S2J") {
+        Service origin_Server;
+        origin_Server.id = 3;
+        strcpy(origin_Server.name, "dhcpServer");
+        strcpy(origin_Server.msg.info, "opendhcpd");
+        Service *pServer = &origin_Server;
+
+        s2j_create_json_obj(testServer);
+        s2j_json_set_basic_element(testServer, pServer, int, id);
+        s2j_json_set_basic_element(testServer, pServer, string, name);
+        s2j_json_set_struct_element(testInfo, testServer, pMsg, pServer, Message, msg);
+        s2j_json_set_basic_element(testInfo, pMsg, string, info);
+
+        int i;
+        CHECK_EQ(testServer->child->valueint, 3);
+        for(i = 0; i < strlen(origin_Server.name); i++) {
+            CHECK_EQ(origin_Server.name[i], testServer->child->next->valuestring[i]);
+        }
+        for(i = 0; i < strlen(origin_Server.msg.info); i++) {
+            CHECK_EQ(origin_Server.msg.info[i], testServer->child->next->next->child->valuestring[i]);
+        }
+    }
+
+    TEST_CASE("J2S") {
+        char originServer[] = R"({"id":3, "name":"dhcpServer", "message":{"info":"opendhcpd"}})";
+        cJSON *testServer = cJSON_Parse(originServer);
+
+        s2j_create_struct_obj(pServer, Service);
+        s2j_struct_get_basic_element(pServer, testServer, int, id);
+        s2j_struct_get_basic_element(pServer, testServer, string, name);
+        s2j_struct_get_struct_element(pMsg, pServer, testInfo, testServer, Message, msg);
+        s2j_struct_get_basic_element(pMsg, testInfo, string, info);
+
+        CHECK_EQ(pServer->id, 3);
+    }
+}