1 files changed, 21 insertions, 0 deletions
diff --git a/nixpkgs/lib/tests/modules/test-mergeAttrDefinitionsWithPrio.nix b/nixpkgs/lib/tests/modules/test-mergeAttrDefinitionsWithPrio.nix
new file mode 100644
index 000000000000..3233f4151368
--- /dev/null
+++ b/nixpkgs/lib/tests/modules/test-mergeAttrDefinitionsWithPrio.nix
@@ -0,0 +1,21 @@
+{ lib, options, ... }:
+
+let
+  defs = lib.modules.mergeAttrDefinitionsWithPrio options._module.args;
+  assertLazy = pos: throw "${pos.file}:${toString pos.line}:${toString pos.column}: The test must not evaluate this the assertLazy thunk, but it did. Unexpected strictness leads to unexpected errors and performance problems.";
+in
+
+{
+  options.result = lib.mkOption { };
+  config._module.args = {
+    default = lib.mkDefault (assertLazy __curPos);
+    regular = null;
+    force = lib.mkForce (assertLazy __curPos);
+    unused = assertLazy __curPos;
+  };
+  config.result =
+    assert defs.default.highestPrio == (lib.mkDefault (assertLazy __curPos)).priority;
+    assert defs.regular.highestPrio == lib.modules.defaultOverridePriority;
+    assert defs.force.highestPrio == (lib.mkForce (assertLazy __curPos)).priority;
+    true;
+}