diff --git a/.coderabbit.yaml b/.coderabbit.yaml
new file mode 100644
index 0000000..b2d4e44
--- /dev/null
+++ b/.coderabbit.yaml
@@ -0,0 +1,15 @@
+# yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json
+language: "en-US"
+early_access: false
+reviews:
+  profile: "chill"
+  request_changes_workflow: false
+  high_level_summary: true
+  poem: true
+  review_status: true
+  collapse_walkthrough: false
+  auto_review:
+    enabled: true
+    drafts: false
+chat:
+  auto_reply: true
\ No newline at end of file
diff --git a/.github/workflows/code-checker.yml b/.github/workflows/code-checker.yml
index e36cae6..bd5f692 100644
--- a/.github/workflows/code-checker.yml
+++ b/.github/workflows/code-checker.yml
@@ -14,7 +14,7 @@ on:
 
 
 env:
-  TESTCOVERAGE_THRESHOLD: 10
+  TESTCOVERAGE_THRESHOLD: 20
 
 jobs:
   lint:
diff --git a/.github/workflows/pr-size-labeler.yml b/.github/workflows/pr-size-labeler.yml
new file mode 100644
index 0000000..77030a5
--- /dev/null
+++ b/.github/workflows/pr-size-labeler.yml
@@ -0,0 +1,28 @@
+name: 👀 Pull Request Size Labeler
+
+on: [pull_request]
+
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    name: Label the PR size
+    steps:
+      - uses: codelytv/pr-size-labeler@v1
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          xs_label: 'size/xs'
+          xs_max_size: '10'
+          s_label: 'size/s'
+          s_max_size: '100'
+          m_label: 'size/m'
+          m_max_size: '500'
+          l_label: 'size/l'
+          l_max_size: '1000'
+          xl_label: 'size/xl'
+          fail_if_xl: 'false'
+          message_if_xl: >
+            This PR exceeds the recommended size of 1000 lines.
+            Please make sure you are NOT addressing multiple issues with one PR.
+            Note this PR might be rejected due to its size.
+          github_api_url: 'https://api.github.com'
+          files_to_ignore: ''
\ No newline at end of file
diff --git a/go.mod b/go.mod
index 9d692fd..b110c94 100644
--- a/go.mod
+++ b/go.mod
@@ -15,6 +15,7 @@ require (
 	github.com/ilyakaznacheev/cleanenv v1.5.0
 	github.com/jmoiron/sqlx v1.4.0
 	github.com/opentracing/opentracing-go v1.2.0
+	github.com/valyala/fasthttp v1.54.0
 	go.uber.org/mock v0.4.0
 )
 
@@ -40,7 +41,6 @@ require (
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/uber/jaeger-lib v2.4.1+incompatible // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
-	github.com/valyala/fasthttp v1.54.0 // indirect
 	github.com/valyala/tcplisten v1.0.0 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	golang.org/x/arch v0.0.0-20210923205945-b76863e36670 // indirect
diff --git a/internal/app/api/handler/auth_handler.go b/internal/app/api/handler/auth_handler.go
index 1483578..975735c 100644
--- a/internal/app/api/handler/auth_handler.go
+++ b/internal/app/api/handler/auth_handler.go
@@ -64,7 +64,6 @@ func (h *AuthHandler) Register(c fiber.Ctx) error {
 	if err != nil {
 		return SendErrorResp(c, fiber.StatusBadRequest, "Invalid request body.")
 	}
-	
 
 	err = validator.New().StructCtx(ctx, req)
 	if err != nil {
@@ -88,6 +87,7 @@ func (h *AuthHandler) Register(c fiber.Ctx) error {
 	if err != nil {
 		return SendErrorResp(c, fiber.StatusBadRequest, err.Error())
 	}
+
 	res := map[string]int64{
 		"user_id": result,
 	}
diff --git a/internal/app/api/handler/auth_handler_test.go b/internal/app/api/handler/auth_handler_test.go
index 47f2b7f..89c5220 100644
--- a/internal/app/api/handler/auth_handler_test.go
+++ b/internal/app/api/handler/auth_handler_test.go
@@ -1,14 +1,18 @@
 package handler
 
 import (
+	"database/sql"
+	"errors"
+	"reflect"
 	"testing"
 
 	"github.com/bytedance/sonic"
 	"github.com/gofiber/fiber/v3"
 	"github.com/valyala/fasthttp"
-
 	"github.com/voltgizerz/POS-restaurant/internal/app/constants"
 	"github.com/voltgizerz/POS-restaurant/internal/app/entity"
+	"github.com/voltgizerz/POS-restaurant/internal/app/interactor"
+	"go.uber.org/mock/gomock"
 )
 
 func TestAuthHandler_Login(t *testing.T) {
@@ -26,6 +30,7 @@ func TestAuthHandler_Login(t *testing.T) {
 			setup: func(mockObj *MockObject) fiber.Ctx {
 				mockCtx := app.AcquireCtx(&fasthttp.RequestCtx{})
 				mockCtx.Locals(constants.CTXKeyRequestID, "mock-req-id")
+				mockCtx.Request().Header.Set("Content-Type", "application/json")
 
 				data, _ := sonic.Marshal(entity.LoginRequest{
 					Username: "fELIX",
@@ -33,8 +38,74 @@ func TestAuthHandler_Login(t *testing.T) {
 				})
 				mockCtx.Request().SetBodyString(string(data))
 
-				// mockObj.MockAuthService.EXPECT().Login(gomock.Any(), gomock.Any(), gomock.Any()).
-				// 	Return(&entity.LoginResponse{}, nil).Times(1)
+				mockObj.MockAuthService.EXPECT().Login(gomock.Any(), gomock.Any(), gomock.Any()).
+					Return(&entity.LoginResponse{}, nil).Times(1)
+				return mockCtx
+			},
+		},
+		{
+			name:    "ERROR - on Bind",
+			wantErr: false,
+			setup: func(mockObj *MockObject) fiber.Ctx {
+				mockCtx := app.AcquireCtx(&fasthttp.RequestCtx{})
+				mockCtx.Locals(constants.CTXKeyRequestID, "mock-req-id")
+				mockCtx.Request().Header.Set("Content-Type", "random")
+
+				return mockCtx
+			},
+		},
+		{
+			name:    "Error - on Validator",
+			wantErr: false,
+			setup: func(mockObj *MockObject) fiber.Ctx {
+				mockCtx := app.AcquireCtx(&fasthttp.RequestCtx{})
+				mockCtx.Locals(constants.CTXKeyRequestID, "mock-req-id")
+				mockCtx.Request().Header.Set("Content-Type", "application/json")
+
+				data, _ := sonic.Marshal(entity.LoginRequest{
+					Username: "",
+					Password: "fELIX",
+				})
+				mockCtx.Request().SetBodyString(string(data))
+
+				return mockCtx
+			},
+		},
+		{
+			name:    "Error - on Login",
+			wantErr: false,
+			setup: func(mockObj *MockObject) fiber.Ctx {
+				mockCtx := app.AcquireCtx(&fasthttp.RequestCtx{})
+				mockCtx.Locals(constants.CTXKeyRequestID, "mock-req-id")
+				mockCtx.Request().Header.Set("Content-Type", "application/json")
+
+				data, _ := sonic.Marshal(entity.LoginRequest{
+					Username: "felix",
+					Password: "fELIX",
+				})
+				mockCtx.Request().SetBodyString(string(data))
+
+				mockObj.MockAuthService.EXPECT().Login(gomock.Any(), gomock.Any(), gomock.Any()).
+					Return(nil, errors.New("some errors")).Times(1)
+				return mockCtx
+			},
+		},
+		{
+			name:    "Error - on Login got no rows",
+			wantErr: false,
+			setup: func(mockObj *MockObject) fiber.Ctx {
+				mockCtx := app.AcquireCtx(&fasthttp.RequestCtx{})
+				mockCtx.Locals(constants.CTXKeyRequestID, "mock-req-id")
+				mockCtx.Request().Header.Set("Content-Type", "application/json")
+
+				data, _ := sonic.Marshal(entity.LoginRequest{
+					Username: "felix",
+					Password: "fELIX",
+				})
+				mockCtx.Request().SetBodyString(string(data))
+
+				mockObj.MockAuthService.EXPECT().Login(gomock.Any(), gomock.Any(), gomock.Any()).
+					Return(nil, sql.ErrNoRows).Times(1)
 				return mockCtx
 			},
 		},
@@ -43,12 +114,11 @@ func TestAuthHandler_Login(t *testing.T) {
 		ctrl, mockObj := NewMock(t)
 		defer ctrl.Finish()
 
+		c := tt.setup(mockObj)
 		authHandler := &AuthHandler{
 			authService: mockObj.MockAuthService,
 		}
 
-		c := tt.setup(mockObj)
-
 		t.Run(tt.name, func(t *testing.T) {
 			if err := authHandler.Login(c); (err != nil) != tt.wantErr {
 				t.Errorf("AuthHandler.Login() error = %v, wantErr %v", err, tt.wantErr)
@@ -56,3 +126,27 @@ func TestAuthHandler_Login(t *testing.T) {
 		})
 	}
 }
+
+func TestNewAuthHandler(t *testing.T) {
+	type args struct {
+		i interactor.AuthHandler
+	}
+	tests := []struct {
+		name string
+		args args
+		want *AuthHandler
+	}{
+		{
+			name: "SUCCESS",
+			args: args{},
+			want: &AuthHandler{},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := NewAuthHandler(tt.args.i); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("NewAuthHandler() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/internal/app/auth/auth.go b/internal/app/auth/auth.go
index 8a84113..f878d1f 100644
--- a/internal/app/auth/auth.go
+++ b/internal/app/auth/auth.go
@@ -43,11 +43,11 @@ func GetUserLoginFromCtx(ctx context.Context) (*Auth, error) {
 
 	// Create a new User struct with the retrieved values
 	user := &Auth{
-		UserID:    int64(userID),
-		Username:  username,
-		RoleID:    int64(roleID),
-		IsUserActive:  isUserActive,
-		RequestID: requestID,
+		UserID:       int64(userID),
+		Username:     username,
+		RoleID:       int64(roleID),
+		IsUserActive: isUserActive,
+		RequestID:    requestID,
 	}
 
 	return user, nil
diff --git a/internal/app/repository/user_repository_test.go b/internal/app/repository/user_repository_test.go
index fa1bda3..003a521 100644
--- a/internal/app/repository/user_repository_test.go
+++ b/internal/app/repository/user_repository_test.go
@@ -28,7 +28,7 @@ func TestUserRepository_GetUserByEmail(t *testing.T) {
 		{
 			name: "SUCCESS - GetUserByEmail",
 			args: args{
-				
+
 				ctx:   context.Background(),
 				email: "mock@email.com",
 			},
diff --git a/internal/app/service/auth_service_test.go b/internal/app/service/auth_service_test.go
index 3ff03eb..a1f680a 100644
--- a/internal/app/service/auth_service_test.go
+++ b/internal/app/service/auth_service_test.go
@@ -6,9 +6,10 @@ import (
 	"reflect"
 	"testing"
 
+	"go.uber.org/mock/gomock"
+
 	"github.com/voltgizerz/POS-restaurant/internal/app/entity"
 	"github.com/voltgizerz/POS-restaurant/internal/app/interactor"
-	"go.uber.org/mock/gomock"
 )
 
 func TestUserService_Login(t *testing.T) {