diff --git a/charts/gha-runner-scale-set-controller-experimental/tests/controller_serviceaccount_create_toggle_test.yaml b/charts/gha-runner-scale-set-controller-experimental/tests/controller_serviceaccount_create_toggle_test.yaml
new file mode 100644
index 00000000..e5fbe962
--- /dev/null
+++ b/charts/gha-runner-scale-set-controller-experimental/tests/controller_serviceaccount_create_toggle_test.yaml
@@ -0,0 +1,46 @@
+suite: "Controller serviceAccount.create toggle"
+templates:
+  - serviceaccount.yaml
+  - deployment.yaml
+tests:
+  - it: should create ServiceAccount and use it in Deployment when create is true
+    set:
+      controller:
+        manager:
+          container:
+            image: "ghcr.io/actions/gha-runner-scale-set-controller:latest"
+        serviceAccount:
+          create: true
+          name: ""
+    release:
+      name: "test-name"
+      namespace: "test-namespace"
+    asserts:
+      - hasDocuments:
+          count: 1
+        template: serviceaccount.yaml
+      - equal:
+          path: spec.template.spec.serviceAccountName
+          value: "test-name-gha-rs-controller"
+        template: deployment.yaml
+
+  - it: should not create ServiceAccount and use provided name in Deployment when create is false
+    set:
+      controller:
+        manager:
+          container:
+            image: "ghcr.io/actions/gha-runner-scale-set-controller:latest"
+        serviceAccount:
+          create: false
+          name: "existing-sa"
+    release:
+      name: "test-name"
+      namespace: "test-namespace"
+    asserts:
+      - hasDocuments:
+          count: 0
+        template: serviceaccount.yaml
+      - equal:
+          path: spec.template.spec.serviceAccountName
+          value: "existing-sa"
+        template: deployment.yaml