fix: amount conversion in staking for vechain

Ticket: SC-2596

Author: Gautam2305

modules/sdk-coin-vet/src/lib/transaction/stakingTransaction.ts

@@ -5,6 +5,7 @@ import { Transaction } from './transaction';
 import { VetTransactionData } from '../iface';
 import EthereumAbi from 'ethereumjs-abi';
 import utils from '../utils';
+import BigNumber from 'bignumber.js';
 
 export class StakingTransaction extends Transaction {
   private _stakingContractAddress: string;
@@ -129,7 +130,7 @@ export class StakingTransaction extends Transaction {
       // Set recipients from clauses
       this.recipients = body.clauses.map((clause) => ({
         address: (clause.to || '0x0').toString().toLowerCase(),
-        amount: String(clause.value || '0'),
+        amount: new BigNumber(clause.value || 0).toString(),
       }));
       this.loadInputsAndOutputs();
 

modules/sdk-coin-vet/test/resources/vet.ts

@@ -11,6 +11,9 @@ export const SPONSORED_TOKEN_TRANSACTION =
 export const SPONSORED_NFT_TRANSACTION =
   '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';
 
+export const STAKING_TRANSACTION =
+  '0xf8e22788015a07263f9d6fc140f845f843941ec1d168574603ec35b9d229843b7c2b44bcb770880de0b6b3a7640000a4a694fc3a0000000000000000000000000000000000000000000001000000000000000000818082b9cd808306da0dc101b882dfcfaea89c500ac28fff75a1fa83b84dc157f23021e81383518550bf69f626ca184d58060663e013e4dd6f73b64000c5133204ffa6948eaea51b4f1bfc371683019e7476b5df49d75d969894b38e4913767107ab3d0d12313f5c1c398bdaf31a2d1df47ac763a1de1d07008e5e800fe65c4e867cf7ca57fbaf709cddab2a648bca01';
+
 export const VALID_TOKEN_SIGNABLE_PAYLOAD =
   'f8762788014ead140e77bbc140f85ef85c940000000000000000000000000000456e6572677980b844a9059cbb000000000000000000000000e59f1cea4e0fef511e3d0f4eec44adf19c4cbeec000000000000000000000000000000000000000000000000016345785d8a000081808252088082faf8c101';
 

modules/sdk-coin-vet/test/transactionBuilder/stakingTransaction.ts

@@ -4,6 +4,7 @@ import should from 'should';
 import { STAKING_METHOD_ID } from '../../src/lib/constants';
 import EthereumAbi from 'ethereumjs-abi';
 import { BN } from 'ethereumjs-util';
+import * as testData from '../resources/vet';
 
 describe('VET Staking Transaction', function () {
   const factory = new TransactionBuilderFactory(coins.get('tvet'));
@@ -257,5 +258,19 @@ describe('VET Staking Transaction', function () {
       // Verify recipients
       stakingTx.recipients[0].amount.should.equal(largeAmount);
     });
+
+    it('should build a signed tx and validate its toJson', async function () {
+      const txBuilder = factory.from(testData.STAKING_TRANSACTION);
+      const tx = txBuilder.transaction as StakingTransaction;
+      const toJson = tx.toJson();
+      toJson.id.should.equal('0x4fd543eb5ac4e4b1a3eeda7335cd8ba449e5aef6dff243a55d83daf480526e11');
+      toJson.stakingContractAddress?.should.equal('0x1ec1d168574603ec35b9d229843b7c2b44bcb770');
+      toJson.amountToStake?.should.equal('0xde0b6b3a7640000');
+      toJson.nonce.should.equal('449037');
+      toJson.gas.should.equal(47565);
+      toJson.gasPriceCoef.should.equal(128);
+      toJson.expiration.should.equal(64);
+      toJson.chainTag.should.equal(39);
+    });
   });
 });