push sheeet

lib/tests/modules/mkDefinition.nix

@@ -0,0 +1,71 @@
+{ lib, ... }:
+let
+  inherit (lib)
+    mkOption
+    mkDefinition
+    mkOptionDefault
+    ;
+in
+{
+  imports = [
+    {
+      _file = "file";
+      options.conflict = mkOption {
+        default = 1;
+      };
+      config.conflict = mkDefinition {
+        file = "other";
+        value = mkOptionDefault 42;
+      };
+    }
+    {
+      # Check that mkDefinition works within 'config'
+      options.viaConfig = mkOption { };
+      config.viaConfig = mkDefinition {
+        file = "other";
+        value = true;
+      };
+    }
+    {
+      # Check mkMerge can wrap mkDefinitions
+      # Not the other way around
+      options.mkMerge = mkOption {
+        type = lib.types.bool;
+      };
+      config.mkMerge = lib.mkMerge [
+        (mkDefinition {
+          file = "a.nix";
+          value = true;
+        })
+        (mkDefinition {
+          file = "b.nix";
+          value = true;
+        })
+      ];
+    }
+    {
+      # Check mkDefinition can use mkForce on the value
+      # Not the other way around
+      options.mkForce = mkOption {
+        type = lib.types.bool;
+        default = false;
+      };
+      config.mkForce = mkDefinition {
+        file = "other";
+        value = lib.mkForce true;
+      };
+    }
+    {
+      # Currently expects an error
+      # mkDefinition doesn't work on option default
+      # This is a limitation and might be resolved in the future
+      options.viaOptionDefault = mkOption {
+        type = lib.types.bool;
+        default = mkDefinition {
+          file = "other";
+          value = true;
+        };
+      };
+    }
+  ];
+}