diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000000..4925ac6a86
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,44 @@
+name: ci
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v6
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version: "1.26.0"
+      - name: run unit test
+        run: go test ./... -cover
+      - name: install gosec
+        run: go install github.com/securego/gosec/v2/cmd/gosec@latest
+      - name: run test with gosec
+        run: gosec ./...
+
+  style:
+    name: Style
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v6
+    - name: Set up Go
+      uses: actions/setup-go@v6
+      with:
+        go-version: "1.26.0"
+    - name: Code formatting cek
+      run: test -z $(go fmt ./...)
+    - name: Install Static Check
+      run: go install honnef.co/go/tools/cmd/staticcheck@latest
+    - name: linting with Static Check
+      run: staticcheck ./...
+    
+      
diff --git a/README.md b/README.md
index c2bec0368b..01c521a6bd 100644
--- a/README.md
+++ b/README.md
@@ -21,3 +21,7 @@ go build -o notely && ./notely
 *This starts the server in non-database mode.* It will serve a simple webpage at `http://localhost:8080`.
 
 You do *not* need to set up a database or any interactivity on the webpage yet. Instructions for that will come later in the course!
+
+Pikron's version of Boot.dev's Notely app.
+
+![alt text goes here](https://github.com/fikri220/learn-cicd-starter/actions/workflows/ci.yml/badge.svg)
\ No newline at end of file
diff --git a/internal/auth/get_api_key_test.go b/internal/auth/get_api_key_test.go
new file mode 100644
index 0000000000..90dc8c1c74
--- /dev/null
+++ b/internal/auth/get_api_key_test.go
@@ -0,0 +1,75 @@
+package auth
+
+import (
+	"errors"
+	"net/http"
+	"testing"
+)
+
+func TestGetAPIKey(t *testing.T) {
+
+	tests := []struct {
+		name        string
+		header      string
+		expectedKey string
+		expectedErr error
+	}{
+		{
+			name:        "valid api key",
+			header:      "ApiKey abc123",
+			expectedKey: "abc123",
+			expectedErr: nil,
+		},
+		{
+			name:        "missing authorization header",
+			header:      "",
+			expectedKey: "",
+			expectedErr: ErrNoAuthHeaderIncluded,
+		},
+		{
+			name:        "wrong authorization scheme",
+			header:      "Bearer abc123",
+			expectedKey: "",
+			expectedErr: errors.New("malformed authorization header"),
+		},
+		{
+			name:        "missing api key",
+			header:      "ApiKey",
+			expectedKey: "",
+			expectedErr: errors.New("malformed authorization header"),
+		},
+		{
+			// Sesuai implementasi GetAPIKey saat ini (strings.Split),
+			// "ApiKey " dianggap valid dan menghasilkan key kosong.
+			name:        "empty api key",
+			header:      "ApiKey ",
+			expectedKey: "",
+			expectedErr: nil,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			headers := http.Header{}
+			if tt.header != "" {
+				headers.Set("Authorization", tt.header)
+			}
+			key, err := GetAPIKey(headers)
+			if key != tt.expectedKey {
+				t.Errorf("expected key %q, got %q", tt.expectedKey, key)
+			}
+			if tt.expectedErr == nil {
+				if err != nil {
+					t.Fatalf("expected no error, got %v", err)
+				}
+				return
+			}
+			if err == nil {
+				t.Fatalf("expected error %v, got nil", tt.expectedErr)
+			}
+			if err.Error() != tt.expectedErr.Error() {
+				t.Errorf("expected error %q, got %q", tt.expectedErr.Error(), err.Error())
+			}
+		})
+	}
+
+}
diff --git a/json.go b/json.go
index 1e6e7985e1..30eae27359 100644
--- a/json.go
+++ b/json.go
@@ -30,5 +30,7 @@ func respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {
 		return
 	}
 	w.WriteHeader(code)
-	w.Write(dat)
+	if _, err := w.Write(dat); err != nil {
+    	log.Printf("failed to write response: %v", err)
+	}
 }
diff --git a/main.go b/main.go
index 19d7366c5f..eb5053ceec 100644
--- a/main.go
+++ b/main.go
@@ -7,6 +7,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"time"
 
 	"github.com/go-chi/chi"
 	"github.com/go-chi/cors"
@@ -32,7 +33,7 @@ func main() {
 
 	port := os.Getenv("PORT")
 	if port == "" {
-		log.Fatal("PORT environment variable is not set")
+		log.Fatal("PORT environment variable is not set yet")
 	}
 
 	apiCfg := apiConfig{}
@@ -91,8 +92,9 @@ func main() {
 	srv := &http.Server{
 		Addr:    ":" + port,
 		Handler: router,
+		ReadHeaderTimeout: 5 * time.Second,
 	}
 
-	log.Printf("Serving on port: %s\n", port)
 	log.Fatal(srv.ListenAndServe())
+	//trigger testing PR
 }