diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..eacc966
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,22 @@
+name: ci
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  tests:
+    name: Tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.23.0"
+
+      - name: Tests
+        run: go test ./... -cover
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 2092f54..acbaff2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@ out
 .env
 learn-cicd-starter
 notely
+
+.idea
\ No newline at end of file
diff --git a/README.md b/README.md
index c2bec03..df840da 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+![tests](https://github.com/rdarius/learn-cicd-starter/actions/workflows/ci.yml/badge.svg)
+
 # learn-cicd-starter (Notely)
 
 This repo contains the starter code for the "Notely" application for the "Learn CICD" course on [Boot.dev](https://boot.dev).
@@ -21,3 +23,5 @@ 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!
+
+RDarius' version of Boot.dev's Notely app
\ No newline at end of file
diff --git a/internal/auth/auth_test.go b/internal/auth/auth_test.go
new file mode 100644
index 0000000..afd6179
--- /dev/null
+++ b/internal/auth/auth_test.go
@@ -0,0 +1,71 @@
+package auth
+
+import (
+	"errors"
+	"net/http"
+	"testing"
+)
+
+func TestGetAPIKey_ValidHeader(t *testing.T) {
+	headers := http.Header{}
+	headers.Set("Authorization", "ApiKey valid-api-key-123")
+
+	apiKey, err := GetAPIKey(headers)
+	if err != nil {
+		t.Fatalf("expected no error, got %v", err)
+	}
+	if apiKey != "valid-api-key-123" {
+		t.Fatalf("expected API key to be 'valid-api-key-123', got '%s'", apiKey)
+	}
+}
+
+func TestGetAPIKey_MissingHeader(t *testing.T) {
+	headers := http.Header{}
+
+	_, err := GetAPIKey(headers)
+	if err == nil {
+		t.Fatal("expected an error, got nil")
+	}
+	if !errors.Is(err, ErrNoAuthHeaderIncluded) {
+		t.Fatalf("expected error to be 'ErrNoAuthHeaderIncluded', got '%v'", err)
+	}
+}
+
+func TestGetAPIKey_MalformedHeader_MissingPrefix(t *testing.T) {
+	headers := http.Header{}
+	headers.Set("Authorization", "Bearer invalid-api-key") // Invalid prefix, should be ApiKey
+
+	_, err := GetAPIKey(headers)
+	if err == nil {
+		t.Fatal("expected an error, got nil")
+	}
+	if err.Error() != "malformed authorization header" {
+		t.Fatalf("expected error to be 'malformed authorization header', got '%v'", err)
+	}
+}
+
+func TestGetAPIKey_MalformedHeader_MissingKey(t *testing.T) {
+	headers := http.Header{}
+	headers.Set("Authorization", "ApiKey") // Missing key part
+
+	_, err := GetAPIKey(headers)
+	if err == nil {
+		t.Fatal("expected an error, got nil")
+	}
+	if err.Error() != "malformed authorization header" {
+		t.Fatalf("expected error to be 'malformed authorization header', got '%v'", err)
+	}
+}
+
+func TestGetAPIKey_EmptyHeader(t *testing.T) {
+	headers := http.Header{}
+	headers.Set("Authorization", "") // Empty header value
+
+	_, err := GetAPIKey(headers)
+	if err == nil {
+		t.Fatal("expected an error, got nil")
+	}
+	if !errors.Is(err, ErrNoAuthHeaderIncluded) {
+		t.Fatalf("expected error to be 'ErrNoAuthHeaderIncluded', got '%v'", err)
+	}
+}