1 files changed, 58 insertions, 0 deletions
diff --git a/nixpkgs/lib/tests/modules/deferred-module.nix b/nixpkgs/lib/tests/modules/deferred-module.nix
new file mode 100644
index 000000000000..d03c60b029bf
--- /dev/null
+++ b/nixpkgs/lib/tests/modules/deferred-module.nix
@@ -0,0 +1,58 @@
+{ lib, ... }:
+let
+  inherit (lib) types mkOption setDefaultModuleLocation;
+  inherit (types) deferredModule lazyAttrsOf submodule str raw enum;
+in
+{
+  imports = [
+    # generic module, declaring submodules:
+    #   - nodes.<name>
+    #   - default
+    # where all nodes include the default
+    ({ config, ... }: {
+      _file = "generic.nix";
+      options.nodes = mkOption {
+        type = lazyAttrsOf (submodule { imports = [ config.default ]; });
+        default = {};
+      };
+      options.default = mkOption {
+        type = deferredModule;
+        default = { };
+        description = ''
+          Module that is included in all nodes.
+        '';
+      };
+    })
+
+    {
+      _file = "default-1.nix";
+      default = { config, ... }: {
+        options.settingsDict = lib.mkOption { type = lazyAttrsOf str; default = {}; };
+        options.bottom = lib.mkOption { type = enum []; };
+      };
+    }
+
+    {
+      _file = "default-a-is-b.nix";
+      default = ./define-settingsDict-a-is-b.nix;
+    }
+
+    {
+      _file = "nodes-foo.nix";
+      nodes.foo.settingsDict.b = "beta";
+    }
+
+    {
+      _file = "the-file-that-contains-the-bad-config.nix";
+      default.bottom = "bogus";
+    }
+
+    {
+      _file = "nodes-foo-c-is-a.nix";
+      nodes.foo = { config, ... }: {
+        settingsDict.c = config.settingsDict.a;
+      };
+    }
+
+  ];
+}