Updated logic to handle when parts of the msg object are changed to strings

nodes/PayloadValidator.js

@@ -65,6 +65,21 @@ module.exports = class PayloadValidator {
     return _.set(object, location, value);
   }
 
+  /**
+   * lodash set will always pass but might not actually set the value
+   * So here we test that it was actually set and use that to confirm we can set
+   *
+   * @param {*} object
+   * @param {*} location
+   * @returns
+   */
+  canSet(object, location) {
+    const test = 'test';
+    let clonedObject = clone(object);
+    clonedObject = this.setValue(clonedObject, location, test);
+    return test === this.getValue(clonedObject, location);
+  }
+
   check(_after) {
     let after = _after;
     try {
@@ -85,6 +100,10 @@ module.exports = class PayloadValidator {
             details,
             conversationId: this.conversationId
           });
+
+          if (!this.canSet(after, location)) {
+            throw new Error(`Cant set value as ${location} is no longer present in after`);
+          }
           after = this.setValue(after, location, beforeValue);
         }
       });