test: Demo access to nested and object properties (#3580)

Author: claremacrae

tests/Scripting/TaskProperties.test.task_frontmatter_properties.approved.md

@@ -14,6 +14,11 @@
 | `task.file.property('sample_link_property')` | `string` | `'[[yaml_all_property_types_populated]]'` |
 | `task.file.property('sample_link_list_property')` | `string[]` | `['[[yaml_all_property_types_populated]]', '[[yaml_all_property_types_empty]]']` |
 | `task.file.property('tags')` | `string[]` | `['#tag-from-file-properties']` |
+| `task.file.property('nested_data').surname` | `string` | `'Doe'` |
+| `task.file.property('nested_data').firstname` | `string` | `'Jane'` |
+| `task.file.property('nested_data')['middle name']` | `string` | `'Frances'` |
+| `task.file.property('object_serialization').nested1` | `string` | `'value1'` |
+| `task.file.property('object_serialization').nested2` | `string` | `'value2'` |
 
 
 <!-- placeholder to force blank line after included text -->

tests/Scripting/TaskProperties.test.ts

@@ -188,6 +188,14 @@ describe('task', () => {
             "task.file.property('sample_link_property')",
             "task.file.property('sample_link_list_property')",
             "task.file.property('tags')",
+
+            "task.file.property('nested_data').surname",
+            "task.file.property('nested_data').firstname",
+            "task.file.property('nested_data')['middle name']",
+
+            "task.file.property('object_serialization').nested1",
+            "task.file.property('object_serialization').nested2",
+
             // 'task.file.tags', // TODO Replace
             // 'task.file.tags()', // TODO Implement
             // "task.file.tags('body')", // TODO Implement