add script

scripting_in_postman.txt

+const schema = {
+    "type": "array",
+    "items": {
+        "$ref": "#/definitions/TreeViewElement"
+    },
+    "definitions": {
+        "TreeViewElement": {
+            "type": "object",
+            "additionalProperties": false,
+            "properties": {
+                "text": {
+                    "type": "string"
+                },
+                "has_checkbox": {
+                    "type": "boolean"
+                },
+                "value": {
+                    "type": "string"
+                },
+                "children": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/TreeViewElement"
+                    }
+                }
+            },
+            "required": [
+                "text"
+            ],
+            "title": "TreeViewElement",
+            "if": {
+                "properties": { 
+                    "has_checkbox": {
+                        "const": true
+                    }
+                }
+            },
+            "then": {
+                "required": [
+                    "text",
+                    "has_checkbox",
+                    "value"
+                ]
+            },
+            "else": {
+                "required": [
+                    "text"
+                ]
+            }
+        }
+    }
+}
+
+pm.test("Validating schema", () => {
+    pm.response.to.have.jsonSchema(schema);
+});
\ No newline at end of file