tests/default: Warn, when a name value pair, contains more names

Otherwise, this leads to really confusing errors.

1 files changed, 6 insertions, 1 deletions

diff --git a/tests/default.nix b/tests/default.nix
index 9bab516..af9cdd3 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -4,7 +4,12 @@
   pkgs,
 }: let
   splitAttr = attr: let
-    name = builtins.elemAt (builtins.attrNames attr) 0;
+    pairs = builtins.attrNames attr;
+    firstName = builtins.elemAt pairs 0;
+    name =
+      if (builtins.length pairs) == 1
+      then firstName
+      else builtins.throw "The name value pair (`${firstName}` and some more) has more than one name value pair.";
   in {
     inherit name;
     value = attr.${name};