diff --git a/tests/lang/eval-okay-builtins-add.exp b/tests/lang/eval-okay-builtins-add.exp
new file mode 100644
index 00000000..b55e8bce
--- /dev/null
+++ b/tests/lang/eval-okay-builtins-add.exp
@@ -0,0 +1 @@
+[ 5 4 "int" "tt" "float" 4.0 ]
diff --git a/tests/lang/eval-okay-builtins-add.nix b/tests/lang/eval-okay-builtins-add.nix
new file mode 100644
index 00000000..c8418162
--- /dev/null
+++ b/tests/lang/eval-okay-builtins-add.nix
@@ -0,0 +1,8 @@
+[
+(builtins.add 2 3)
+(builtins.add 2 2)
+(builtins.typeOf (builtins.add 2  2))
+("t" + "t")
+(builtins.typeOf (builtins.add 2.0 2))
+(builtins.add 2.0 2)
+]