lib/modules: Add error message test for pushing down non-attrsets

lib/tests/modules.sh

@@ -171,6 +171,8 @@ checkConfigError() {
 # Shorthand meta attribute does not duplicate the config
 checkConfigOutput '^"one two"$' config.result ./shorthand-meta.nix
 
+checkConfigError "In module .*test-push-down-non-attrs.nix., you're trying to define a value of type \`bool'\n\s*rather than an attribute set for the option" config ./test-push-down-non-attrs.nix
+
 checkConfigOutput '^true$' config.result ./test-mergeAttrDefinitionsWithPrio.nix
 
 # Check that a module argument is passed, also when a default is available

lib/tests/modules/test-push-down-non-attrs.nix

@@ -0,0 +1,5 @@
+{ lib, ... }:
+
+{
+  config = lib.mkIf true true;
+}