test: add comprehensive unit tests for PropertyStruct based on real BOSH templates

Analyzed property access patterns from cloudfoundry/bosh repository jobs
and added extensive test coverage for:

- Deeply nested property access (e.g., director.db.user, nats.address)
- Property defaults with p('prop', default)
- Conditional property helpers with if_p
- Multiple properties in if_p blocks
- Array iteration with hash element access
- Spec object property access (spec.index, spec.id, spec.ip)
- Complex nested object creation from properties
- Boolean and numeric property types in conditionals

These tests ensure PropertyStruct maintains full compatibility with
OpenStruct for all real-world BOSH template usage patterns.

Related to rkoster/rubionic-workspace#229

Author: rubionic

devbox.lock

@@ -0,0 +1,122 @@
+{
+  "lockfile_version": "1",
+  "packages": {
+    "github:NixOS/nixpkgs/nixpkgs-unstable": {
+      "last_modified": "2025-12-27T21:13:36Z",
+      "resolved": "github:NixOS/nixpkgs/5c2bc52fb9f8c264ed6c93bd20afa2ff5e763dce?lastModified=1766870016&narHash=sha256-fHmxAesa6XNqnIkcS6%2BnIHuEmgd%2FiZSP%2FVXxweiEuQw%3D"
+    },
+    "go@1.24.0": {
+      "last_modified": "2025-02-23T09:42:26Z",
+      "resolved": "github:NixOS/nixpkgs/2d068ae5c6516b2d04562de50a58c682540de9bf#go_1_24",
+      "source": "devbox-search",
+      "version": "1.24.0",
+      "systems": {
+        "aarch64-darwin": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/v495d2fb3ffi08ri6jffvhzr08p104pk-go-1.24.0",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/v495d2fb3ffi08ri6jffvhzr08p104pk-go-1.24.0"
+        },
+        "aarch64-linux": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/fy5xhvha2ha7jcyqp73haqrpg8npw63b-go-1.24.0",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/fy5xhvha2ha7jcyqp73haqrpg8npw63b-go-1.24.0"
+        },
+        "x86_64-darwin": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/gg6947k6wwxq7ld2f90i62fkcf3kdd55-go-1.24.0",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/gg6947k6wwxq7ld2f90i62fkcf3kdd55-go-1.24.0"
+        },
+        "x86_64-linux": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/wk1vg9ksvmqwxhgj7cmvdv1g62v9kff0-go-1.24.0",
+              "default": true
+            }
+          ],
+          "store_path": "/nix/store/wk1vg9ksvmqwxhgj7cmvdv1g62v9kff0-go-1.24.0"
+        }
+      }
+    },
+    "ruby@3.4": {
+      "last_modified": "2025-12-19T06:18:24Z",
+      "plugin_version": "0.0.2",
+      "resolved": "github:NixOS/nixpkgs/7d853e518814cca2a657b72eeba67ae20ebf7059#ruby_3_4",
+      "source": "devbox-search",
+      "version": "3.4.8",
+      "systems": {
+        "aarch64-darwin": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/l7y8sk5wjy059vb4p2zqimhfg81y7k56-ruby-3.4.8",
+              "default": true
+            },
+            {
+              "name": "devdoc",
+              "path": "/nix/store/ml55wc4rwakndj55iw39shbc0pxvpkn2-ruby-3.4.8-devdoc"
+            }
+          ],
+          "store_path": "/nix/store/l7y8sk5wjy059vb4p2zqimhfg81y7k56-ruby-3.4.8"
+        },
+        "aarch64-linux": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/1rack9mx33cqdm8z908yz1a80q153hb1-ruby-3.4.8",
+              "default": true
+            },
+            {
+              "name": "devdoc",
+              "path": "/nix/store/9njsxja1ps0vq25xkaxyb10v01q0lnjd-ruby-3.4.8-devdoc"
+            }
+          ],
+          "store_path": "/nix/store/1rack9mx33cqdm8z908yz1a80q153hb1-ruby-3.4.8"
+        },
+        "x86_64-darwin": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/iwgzafzagsjjdbj6h1pj9xdxxqr8akrl-ruby-3.4.8",
+              "default": true
+            },
+            {
+              "name": "devdoc",
+              "path": "/nix/store/zarwsrj4k6a250v3hd2cvmch5nqnap2q-ruby-3.4.8-devdoc"
+            }
+          ],
+          "store_path": "/nix/store/iwgzafzagsjjdbj6h1pj9xdxxqr8akrl-ruby-3.4.8"
+        },
+        "x86_64-linux": {
+          "outputs": [
+            {
+              "name": "out",
+              "path": "/nix/store/gphbrsb5wd49qwg9bxby194wwm47awks-ruby-3.4.8",
+              "default": true
+            },
+            {
+              "name": "devdoc",
+              "path": "/nix/store/hhzf48bh7drk9a46qzc7d0cwrfisr8yl-ruby-3.4.8-devdoc"
+            }
+          ],
+          "store_path": "/nix/store/gphbrsb5wd49qwg9bxby194wwm47awks-ruby-3.4.8"
+        }
+      }
+    }
+  }
+}