diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000000..82db491c5b
--- /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: "1.25.1"
+
+      - name: Go Test
+        run: go test ./...  -cover
diff --git a/README.md b/README.md
index c2bec0368b..31e8d62b52 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+![CI Badge](https://github.com/mbrunoon/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).
@@ -18,6 +20,8 @@ Run the server:
 go build -o notely && ./notely
 ```
 
-*This starts the server in non-database mode.* It will serve a simple webpage at `http://localhost:8080`.
+_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!
 
-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!
+BRUNOON
diff --git a/internal/auth/auth_test.go b/internal/auth/auth_test.go
new file mode 100644
index 0000000000..1e7740a06f
--- /dev/null
+++ b/internal/auth/auth_test.go
@@ -0,0 +1,69 @@
+package auth
+
+import (
+	"net/http"
+	"testing"
+)
+
+func TestGetAPIKey(t *testing.T) {
+	tests := []struct {
+		name        string
+		headerValue string
+		wantKey     string
+		wantErr     bool
+	}{
+		{
+			name:        "valid api key",
+			headerValue: "ApiKey abcd",
+			wantKey:     "abcd",
+			wantErr:     false,
+		},
+		{
+			name:        "no authorization header",
+			headerValue: "",
+			wantErr:     true,
+		},
+		{
+			name:        "malformed header - missing prefix",
+			headerValue: "abcd",
+			wantErr:     true,
+		},
+		{
+			name:        "malformed header - wrong prefix",
+			headerValue: "Bearer abcd",
+			wantErr:     true,
+		},
+		{
+			name:        "empty key but no error (current behavior)",
+			headerValue: "ApiKey ",
+			wantKey:     "",
+			wantErr:     false,
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			header := http.Header{}
+			if tc.headerValue != "" {
+				header.Set("Authorization", tc.headerValue)
+			}
+
+			got, err := GetAPIKey(header)
+
+			if tc.wantErr {
+				if err == nil {
+					t.Fatalf("expected error, got nil (key: %q)", got)
+				}
+				return
+			}
+
+			if err != nil {
+				t.Fatalf("did not expect error, got: %v", err)
+			}
+
+			if got != tc.wantKey {
+				t.Fatalf("expected key %q, got %q", tc.wantKey, got)
+			}
+		})
+	}
+}