diff --git a/src/test/cljc/dda/c4k_forgejo/backup_test.cljc b/src/test/cljc/dda/c4k_forgejo/backup_test.cljc
new file mode 100644
index 0000000..af9eb55
--- /dev/null
+++ b/src/test/cljc/dda/c4k_forgejo/backup_test.cljc
@@ -0,0 +1,30 @@
+(ns dda.c4k-forgejo.backup-test
+  (:require
+   #?(:clj [clojure.test :refer [deftest is are testing run-tests]]
+      :cljs [cljs.test :refer-macros [deftest is are testing run-tests]])
+   [clojure.spec.test.alpha :as st]
+   [dda.c4k-forgejo.backup :as cut]))
+
+(st/instrument `cut/generate-config)
+
+(deftest should-generate-backup-config
+  (testing "federated"
+    (is (= {:apiVersion "v1",
+            :kind "ConfigMap",
+            :metadata
+            {:name "backup-config",
+             :labels
+             #:app.kubernetes.io{:name "backup", :part-of "forgejo"}},
+            :data {:restic-repository "s3:s3.amazonaws.com/backup/federated-repo"}}
+           (cut/generate-config
+            {:restic-repository "s3:s3.amazonaws.com/backup/federated-repo"}))))
+  (testing "non-federated"
+    (is (= {:apiVersion "v1",
+            :kind "ConfigMap",
+            :metadata
+            {:name "backup-config",
+             :labels
+             #:app.kubernetes.io{:name "backup", :part-of "forgejo"}},
+            :data {:restic-repository "s3:s3.amazonaws.com/backup/repo"}}
+           (cut/generate-config
+            {:restic-repository "s3:s3.amazonaws.com/backup/repo"})))))
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