diff --git a/unittests/deployment/sidecar-container.yaml b/unittests/deployment/sidecar-container.yaml
new file mode 100644
index 0000000..c30a5fe
--- /dev/null
+++ b/unittests/deployment/sidecar-container.yaml
@@ -0,0 +1,20 @@
+suite: sidecar container
+release:
+  name: gitea-unittests
+  namespace: testing
+templates:
+  - templates/gitea/deployment.yaml
+tests:
+  - it: supports adding a sidecar container
+    template: templates/gitea/deployment.yaml
+    set:
+      extraContainers:
+        - name: sidecar-bob
+          image: busybox
+    asserts:
+      - equal:
+          path: spec.template.spec.containers[0].name
+          value: "sidecar-bob"
+      - equal:
+          path: spec.template.spec.containers[0].image
+          value: "busybox"