diff --git a/test/api_test.c b/test/api_test.c
index 920ee9f1455c5318e5d5a373f202cd52a67edb2e..be3d36445f19dddef0c2ada1aea1111cc115850e 100644
--- a/test/api_test.c
+++ b/test/api_test.c
@@ -540,6 +540,77 @@ static void test_json_write_to_file(void **state)
     json_object_put(obj);
 }
 
+static void test_json_set_object_invalid_format(void **state)
+{
+    struct test_env *e = (struct test_env *) *state;
+
+	struct json_object *obj = json_object_new_object();
+
+    json_object_object_add(obj, "test2", json_object_new_string("success"));
+    json_object_object_add(e->file_obj, "string", obj);
+
+    json_object_set_by_string(&e->modify_obj, "string", "{\"test2\":\"success\"", json_type_object);
+
+    printf("e->file_obj=%s\n", json_object_get_string(e->file_obj));
+    printf("e->modify_obj=%s\n", json_object_get_string(e->modify_obj));
+
+    assert_non_null(e->file_obj);
+    assert_non_null(e->modify_obj);
+    assert_int_not_equal(1, json_object_equal(e->modify_obj, e->file_obj));
+}
+
+static void test_json_set_array_invalid_format(void **state)
+{
+    struct test_env *e = (struct test_env *) *state;
+
+	struct json_object *arr = json_object_new_array();
+
+    json_object_array_add(arr, json_object_new_int(1));
+    json_object_array_add(arr, json_object_new_int(2));
+    json_object_array_add(arr, json_object_new_int(3));
+    json_object_object_add(e->file_obj, "ints", arr);
+
+    json_object_set_by_string(&e->modify_obj, "ints", "[ 1, 2 3 ]", json_type_array);
+
+    printf("e->file_obj=%s\n", json_object_get_string(e->file_obj));
+    printf("e->modify_obj=%s\n", json_object_get_string(e->modify_obj));
+
+    assert_non_null(e->file_obj);
+    assert_non_null(e->modify_obj);
+    assert_int_not_equal(1, json_object_equal(e->modify_obj, e->file_obj));
+}
+
+static void test_json_set_wrong_type_string_to_int(void **state)
+{
+    struct test_env *e = (struct test_env *) *state;
+
+    json_object_object_add(e->file_obj, "string", json_object_new_string("abc"));
+
+    json_object_set_by_string(&e->modify_obj, "string", "abc", json_type_int);
+
+    printf("e->file_obj=%s\n", json_object_get_string(e->file_obj));
+    printf("e->modify_obj=%s\n", json_object_get_string(e->modify_obj));
+
+    assert_non_null(e->file_obj);
+    assert_non_null(e->modify_obj);
+    assert_int_not_equal(1, json_object_equal(e->modify_obj, e->file_obj));
+}
+
+static void test_json_set_wrong_type_int_to_string(void **state)
+{
+    struct test_env *e = (struct test_env *) *state;
+
+    json_object_object_add(e->file_obj, "string", json_object_new_int(1));
+
+    json_object_set_by_string(&e->modify_obj, "string", "1", json_type_string);
+
+    printf("e->file_obj=%s\n", json_object_get_string(e->file_obj));
+    printf("e->modify_obj=%s\n", json_object_get_string(e->modify_obj));
+
+    assert_non_null(e->modify_obj);
+    assert_int_not_equal(1, json_object_equal(e->modify_obj, e->file_obj));
+}
+
 static int setup (void** state) {
     struct test_env *e = (struct test_env *) *state;
 
@@ -600,6 +671,10 @@ int main(void) {
         cmocka_unit_test_setup_teardown(test_json_get_array_nested_int, setup, teardown),
         cmocka_unit_test_setup_teardown(test_json_get_object_array_nested_int, setup, teardown),
         cmocka_unit_test_setup_teardown(test_json_write_to_file, setup, teardown),
+        cmocka_unit_test_setup_teardown(test_json_set_object_invalid_format, setup, teardown),
+        cmocka_unit_test_setup_teardown(test_json_set_array_invalid_format, setup, teardown),
+        cmocka_unit_test_setup_teardown(test_json_set_wrong_type_string_to_int, setup, teardown),
+        cmocka_unit_test_setup_teardown(test_json_set_wrong_type_int_to_string, setup, teardown),
 	};
 
 	return cmocka_run_group_tests(tests, group_setup, group_teardown);