diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index f8b121c..01496f8 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -55,6 +55,7 @@ if(ENABLE_CJSON_TEST)
         misc_tests
         parse_with_opts
         compare_tests
+        cjson_add
     )
 
     option(ENABLE_VALGRIND OFF "Enable the valgrind memory checker for the tests.")
diff --git a/tests/cjson_add.c b/tests/cjson_add.c
new file mode 100644
index 0000000..601d666
--- /dev/null
+++ b/tests/cjson_add.c
@@ -0,0 +1,145 @@
+/*
+  Copyright (c) 2009-2017 Dave Gamble and cJSON contributors
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "unity/examples/unity_config.h"
+#include "unity/src/unity.h"
+#include "common.h"
+
+static void cjson_add_null_should_add_null(void)
+{
+    cJSON *root = cJSON_CreateObject();
+    cJSON *null = NULL;
+
+    cJSON_AddNullToObject(root, "null");
+
+    TEST_ASSERT_NOT_NULL(null = cJSON_GetObjectItemCaseSensitive(root, "null"));
+    TEST_ASSERT_EQUAL_INT(null->type, cJSON_NULL);
+
+    cJSON_Delete(root);
+}
+
+static void cjson_add_true_should_add_true(void)
+{
+    cJSON *root = cJSON_CreateObject();
+    cJSON *true_item = NULL;
+
+    cJSON_AddTrueToObject(root, "true");
+
+    TEST_ASSERT_NOT_NULL(true_item = cJSON_GetObjectItemCaseSensitive(root, "true"));
+    TEST_ASSERT_EQUAL_INT(true_item->type, cJSON_True);
+
+    cJSON_Delete(root);
+}
+
+static void cjson_add_false_should_add_false(void)
+{
+    cJSON *root = cJSON_CreateObject();
+    cJSON *false_item = NULL;
+
+    cJSON_AddFalseToObject(root, "false");
+
+    TEST_ASSERT_NOT_NULL(false_item = cJSON_GetObjectItemCaseSensitive(root, "false"));
+    TEST_ASSERT_EQUAL_INT(false_item->type, cJSON_False);
+
+    cJSON_Delete(root);
+}
+
+static void cjson_add_bool_should_add_bool(void)
+{
+    cJSON *root = cJSON_CreateObject();
+    cJSON *true_item = NULL;
+    cJSON *false_item = NULL;
+
+    /* true */
+    cJSON_AddBoolToObject(root, "true", true);
+    TEST_ASSERT_NOT_NULL(true_item = cJSON_GetObjectItemCaseSensitive(root, "true"));
+    TEST_ASSERT_EQUAL_INT(true_item->type, cJSON_True);
+
+    /* false */
+    cJSON_AddBoolToObject(root, "false", false);
+    TEST_ASSERT_NOT_NULL(false_item = cJSON_GetObjectItemCaseSensitive(root, "false"));
+    TEST_ASSERT_EQUAL_INT(false_item->type, cJSON_False);
+
+    cJSON_Delete(root);
+}
+
+static void cjson_add_number_should_add_number(void)
+{
+    cJSON *root = cJSON_CreateObject();
+    cJSON *number = NULL;
+
+    cJSON_AddNumberToObject(root, "number", 42);
+
+    TEST_ASSERT_NOT_NULL(number = cJSON_GetObjectItemCaseSensitive(root, "number"));
+
+    TEST_ASSERT_EQUAL_INT(number->type, cJSON_Number);
+    TEST_ASSERT_EQUAL_DOUBLE(number->valuedouble, 42);
+    TEST_ASSERT_EQUAL_INT(number->valueint, 42);
+
+    cJSON_Delete(root);
+}
+
+static void cjson_add_string_should_add_string(void)
+{
+    cJSON *root = cJSON_CreateObject();
+    cJSON *string = NULL;
+
+    cJSON_AddStringToObject(root, "string", "Hello World!");
+
+    TEST_ASSERT_NOT_NULL(string = cJSON_GetObjectItemCaseSensitive(root, "string"));
+    TEST_ASSERT_EQUAL_INT(string->type, cJSON_String);
+    TEST_ASSERT_EQUAL_STRING(string->valuestring, "Hello World!");
+
+    cJSON_Delete(root);
+}
+
+static void cjson_add_raw_should_add_raw(void)
+{
+    cJSON *root = cJSON_CreateObject();
+    cJSON *raw = NULL;
+
+    cJSON_AddRawToObject(root, "raw", "{}");
+
+    TEST_ASSERT_NOT_NULL(raw = cJSON_GetObjectItemCaseSensitive(root, "raw"));
+    TEST_ASSERT_EQUAL_INT(raw->type, cJSON_Raw);
+    TEST_ASSERT_EQUAL_STRING(raw->valuestring, "{}");
+
+    cJSON_Delete(root);
+}
+
+int main(void)
+{
+    UNITY_BEGIN();
+
+    RUN_TEST(cjson_add_null_should_add_null);
+    RUN_TEST(cjson_add_true_should_add_true);
+    RUN_TEST(cjson_add_false_should_add_false);
+    RUN_TEST(cjson_add_bool_should_add_bool);
+    RUN_TEST(cjson_add_number_should_add_number);
+    RUN_TEST(cjson_add_string_should_add_string);
+
+    return UNITY_END();
+}