diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..61b381c
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,15 @@
+{
+    // 使用 IntelliSense 了解相关属性。 
+    // 悬停以查看现有属性的描述。
+    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..ad78f56
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,6 @@
+{
+    "go.testEnvVars": {
+        "CONFIG_PATH": "application.yaml"
+    },
+    "go.testEnvFile": "${workspaceFolder}/etc/unit_test.env"
+}
\ No newline at end of file
diff --git a/etc/unit_test.env b/etc/unit_test.env
new file mode 100644
index 0000000..000dbd2
--- /dev/null
+++ b/etc/unit_test.env
@@ -0,0 +1 @@
+DB_HOST=127.0.0.1
\ No newline at end of file
diff --git a/go.mod b/go.mod
index 348dd02..4944da1 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.24.1
 require (
 	github.com/caarlos0/env/v6 v6.10.1
 	github.com/gin-gonic/gin v1.10.0
+	github.com/stretchr/testify v1.9.0
 	gopkg.in/yaml.v3 v3.0.1
 	gorm.io/driver/mysql v1.5.7
 	gorm.io/gorm v1.26.0
@@ -15,6 +16,7 @@ require (
 	github.com/bytedance/sonic/loader v0.1.1 // indirect
 	github.com/cloudwego/base64x v0.1.4 // indirect
 	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
@@ -32,6 +34,7 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
 	golang.org/x/arch v0.8.0 // indirect
diff --git a/skills/unit_test/README.md b/skills/unit_test/README.md
new file mode 100644
index 0000000..2e9bb81
--- /dev/null
+++ b/skills/unit_test/README.md
@@ -0,0 +1,86 @@
+# 单元测试
+
+目的: 测试目标函数的功能是否正常
+
+## 构建集成单元测试
+
+目标函数: Add
+站在使用者的角度进行单元测试:  unittest.Add(1, 2) == 3
+
+专门的包: 在同一个目录下，允许有2个包: 一个包就是普通包 unittest, 和一个单元测试包 unittest_test
+
+要求:
+1. 单元测试包的文件名称:  xxx_test.go, 必须以_test结尾，才是一个合格的单元测试包
+2. 必须是 xxx_test 包名
+
+
+
+## 编写单元测试(run test)
+
+编写单元测试代码: Add
+
+1. 单元测试函数 必须以Test大头
+```go
+// 针对Add函数的单元测试
+func TestAdd(t *testing.T) {
+	// 自己手动判断
+	// /usr/local/go/bin/go test -timeout 300s -run ^TestAdd$ 122.51.31.227/go-course/go18/skills/unit_test -v -count=1
+	// 如果没有打印日志， 配置vscode 打印单元测试的日志: -v -count=1
+	// 加上这串配置
+	//     "go.testFlags": [
+	//     "-v",
+	//     "-count=1"
+	// ],
+	t.Log(unittest.Add(1, 2))
+
+	// 通过程序断言来判断
+	// if unittest.Add(1, 2) != 4 {
+	// 	t.Fatalf("1 + 2 != 4")
+	// }
+	// 专门的断言库
+	should := assert.New(t)
+	should.Equal(3, unittest.Add(1, 2))
+}
+```
+
+## 单元测试调试(run debug)
+
+1. 需要加断点, 必须加在有代码的位置
+
+```sh
+go/bin/dlv dap --listen=127.0.0.1:59905 --log-dest=3 from /Users/yumaojun/Projects/go-course/go18/skills/unit_test
+DAP server listening at: 127.0.0.1:59905
+Type 'dlv help' for list of commands.
+```
+
+2. 操作栏
+
+![](./debug.png)
+
+1. Continue: 继续，继续到下一个断点处
+2. Step Over: 下一步，下一行
+3. Step In: 进入到这行里面的 执行逻辑
+4. Step Out: 从这行里面的执行路径出来
+
+## 单元测试的配置
+
+![](./debug_button.png)
+
+单元测试如何读取外部配置, vscode 帮我们执行CLI
+
+告诉vscode，读取单元测试的配置， vscode 如何读取单元测试: 只有一个办法通过环境变量
+1. 直接注入环境变量(Test Env Vars) : .vscode/settions.json
+```json
+{
+    "go.testEnvVars": {
+        "CONFIG_PATH": "application.yaml"
+    }
+}
+```
+2. 将环境变量写入到一个文件中，让vscdoe读取 (Test Env File)
+```json
+{
+    "go.testEnvFile": "${workspaceFolder}/etc/unit_test.env"
+}
+```
+
diff --git a/skills/unit_test/add.go b/skills/unit_test/add.go
new file mode 100644
index 0000000..88e57ab
--- /dev/null
+++ b/skills/unit_test/add.go
@@ -0,0 +1,9 @@
+package unittest
+
+import "fmt"
+
+func Add(x, y int) int {
+	//
+	fmt.Println(y)
+	return x + x
+}
diff --git a/skills/unit_test/add_test.go b/skills/unit_test/add_test.go
new file mode 100644
index 0000000..d8b10c5
--- /dev/null
+++ b/skills/unit_test/add_test.go
@@ -0,0 +1,32 @@
+package unittest_test
+
+import (
+	"os"
+	"testing"
+
+	unittest "122.51.31.227/go-course/go18/skills/unit_test"
+	"github.com/stretchr/testify/assert"
+)
+
+// 针对Add函数的单元测试
+func TestAdd(t *testing.T) {
+	t.Log(os.Getenv("CONFIG_PATH"))
+	t.Log(os.Getenv("DB_HOST"))
+	// 自己手动判断
+	// /usr/local/go/bin/go test -timeout 300s -run ^TestAdd$ 122.51.31.227/go-course/go18/skills/unit_test -v -count=1
+	// 如果没有打印日志， 配置vscode 打印单元测试的日志: -v -count=1
+	// 加上这串配置
+	//     "go.testFlags": [
+	//     "-v",
+	//     "-count=1"
+	// ],
+	t.Log(unittest.Add(1, 2))
+
+	// 通过程序断言来判断
+	// if unittest.Add(1, 2) != 4 {
+	// 	t.Fatalf("1 + 2 != 4")
+	// }
+	// 专门的断言库
+	should := assert.New(t)
+	should.Equal(3, unittest.Add(1, 2))
+}
diff --git a/skills/unit_test/debug.png b/skills/unit_test/debug.png
new file mode 100644
index 0000000..48207db
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diff --git a/skills/unit_test/debug_button.png b/skills/unit_test/debug_button.png
new file mode 100644
index 0000000..15fe353
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