diff --git a/playground/http/postyamlstring_test.go b/playground/http/postyamlstring_test.go
new file mode 100644
index 0000000..ce52571
--- /dev/null
+++ b/playground/http/postyamlstring_test.go
@@ -0,0 +1,46 @@
+package http
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"testing"
+)
+
+func TestPostYamlString(t *testing.T) {
+	var filePath = "/Users/bruce/Desktop/HVAC-CoolMasterNet.yml"
+	var url = "http://localhost:48081/api/v1/deviceprofile/upload"
+
+	// read file to byte
+	yamlFile, err := ioutil.ReadFile(filePath)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fmt.Println(string(yamlFile))
+
+	// create http post request
+	req, err := http.NewRequest(http.MethodPost, url, bytes.NewReader(yamlFile))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// submit request
+	client := &http.Client{}
+	res, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// check response
+	fmt.Println("== upload finish ==")
+	resBody, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Println(res.StatusCode)
+	fmt.Println(res.Header)
+	res.Body.Close()
+	fmt.Println(string(resBody))
+}
diff --git a/playground/http/upload_test.go b/playground/http/upload_test.go
new file mode 100644
index 0000000..2caed0c
--- /dev/null
+++ b/playground/http/upload_test.go
@@ -0,0 +1,63 @@
+package http
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"mime/multipart"
+	"net/http"
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestUploadFormFile(t *testing.T) {
+	var filePath = "/Users/bruce/Desktop/HVAC-CoolMasterNet.yml"
+	var url = "http://localhost:48081/api/v1/deviceprofile/uploadfile"
+
+	// fetch file
+	file, err := os.Open(filePath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer file.Close()
+
+	// create form data
+	var body bytes.Buffer
+	writer := multipart.NewWriter(&body)
+	fmt.Println(filepath.Base(file.Name()))
+	formFile, err := writer.CreateFormFile("file", filepath.Base(file.Name()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err = io.Copy(formFile, file); err != nil {
+		t.Fatal(err)
+	}
+	writer.Close()
+
+	// create http post request
+	req, err := http.NewRequest(http.MethodPost, url, &body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Add("Content-Type", writer.FormDataContentType())
+
+	// submit request
+	client := &http.Client{}
+	res, err := client.Do(req)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// check response
+	fmt.Println("== upload finish ==")
+	resBody, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fmt.Println(res.StatusCode)
+	fmt.Println(res.Header)
+	res.Body.Close()
+	fmt.Println(string(resBody))
+}
diff --git a/playground/pointer/pointer_test.go b/playground/pointer/pointer_test.go
new file mode 100644
index 0000000..56e5016
--- /dev/null
+++ b/playground/pointer/pointer_test.go
@@ -0,0 +1,20 @@
+package pointer
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestBasic(t *testing.T) {
+	answer := 42
+	fmt.Println(&answer) // & is address operator
+
+	address := &answer
+	fmt.Println(*address)                     // * is dereferencing, which providers the value that a memory address refers to.
+	fmt.Printf("address is a %T \n", address) // print the pointer type
+
+	var address2 *int  // declare a pointer
+	address2 = address // address2 can store some pinter type
+	fmt.Println(*address2)
+
+}