1 files changed, 12 insertions, 0 deletions
diff --git a/lib/tests/misc.nix b/lib/tests/misc.nix
index 6527c31e49c2..2e7fda2b1f8b 100644
--- a/lib/tests/misc.nix
+++ b/lib/tests/misc.nix
@@ -43,6 +43,18 @@ in
 
 runTests {
 
+# CUSTOMIZATION
+
+  testFunctionArgsMakeOverridable = {
+    expr = functionArgs (makeOverridable ({ a, b, c ? null}: {}));
+    expected = { a = false; b = false; c = true; };
+  };
+
+  testFunctionArgsMakeOverridableOverride = {
+    expr = functionArgs (makeOverridable ({ a, b, c ? null }: {}) { a = 1; b = 2; }).override;
+    expected = { a = false; b = false; c = true; };
+  };
+
 # TRIVIAL
 
   testId = {