push sheeet

lib/tests/modules/add-check.nix

@@ -0,0 +1,36 @@
+(
+  { lib, ... }:
+  let
+    inherit (lib) types mkOption;
+    inherit (types) addCheck int attrsOf;
+
+    # type with a v1 merge
+    v1Type = addCheck int (v: v == 0);
+
+    # type with a v2 merge
+    v2Type = addCheck (attrsOf int) (v: v ? foo);
+  in
+  {
+    options.v1CheckedPass = mkOption {
+      type = v1Type;
+      default = 0;
+    };
+    options.v1CheckedFail = mkOption {
+      type = v1Type;
+      default = 1;
+    };
+    options.v2checkedPass = mkOption {
+      type = v2Type;
+      default = {
+        foo = 1;
+      };
+      # plug the value to make test script regex simple
+      apply = v: v.foo == 1;
+    };
+    options.v2checkedFail = mkOption {
+      type = v2Type;
+      default = { };
+      apply = v: lib.deepSeq v v;
+    };
+  }
+)