Merge pull request #231 from yusufidimaina9989/txBuilder

shallow copy

docs/how-to-test-a-contract.md

@@ -155,6 +155,19 @@ describe('Test SmartContract `Demo`', () => {
 })
 ```
 
+## Shallow Copy
+
+Sometimes, if you only want to do a shallow copy of some properties, you can pass in the property names as an optional argument like this:
+
+```ts
+const nextInstance = instance.next(
+    {
+        refCloneProps: ['prop1', 'prop2']
+    }
+)
+```
+In this context the `next` is designed to create a shallow copy of the specified properties, allowing for selective copy rather than a complete copy of the entire contract instance.
+
 ## Run tests
 
 
@@ -287,4 +300,4 @@ or
 
 ```sh
 npm run test:testnet
-```
+```