fix(sdk-coin-avaxp): set flat fee for staking tx

Ticket: CR-1207

Author: evanzbitgo

modules/sdk-coin-avaxp/src/avaxp.ts

@@ -8,7 +8,6 @@ import {
   ParseTransactionOptions,
   BaseTransaction,
   InvalidTransactionError,
-  FeeEstimateOptions,
   SigningError,
   TransactionType,
   InvalidAddressError,
@@ -19,7 +18,6 @@ import {
 import * as AvaxpLib from './lib';
 import {
   AvaxpSignTransactionOptions,
-  TransactionFee,
   ExplainTransactionOptions,
   AvaxpVerifyTransactionOptions,
   AvaxpTransactionStakingOptions,
@@ -318,11 +316,6 @@ export class AvaxP extends BaseCoin {
       : { halfSigned: { txHex: transaction.toBroadcastFormat() } };
   }
 
-  async feeEstimate(params: FeeEstimateOptions): Promise<TransactionFee> {
-    // staking transactions are fee-less
-    return { fee: '0' };
-  }
-
   async parseTransaction(params: ParseTransactionOptions): Promise<ParsedTransaction> {
     return {};
   }

modules/sdk-coin-avaxp/src/lib/permissionlessValidatorTxBuilder.ts

@@ -54,6 +54,7 @@ export class PermissionlessValidatorTxBuilder extends TransactionBuilder {
    */
   constructor(coinConfig: Readonly<CoinConfig>) {
     super(coinConfig);
+    this.transaction._fee.fee = this.transaction._network.txFee;
   }
 
   /**

modules/sdk-coin-avaxp/test/unit/lib/permissionlessValidatorTxBuilder.ts

@@ -185,6 +185,7 @@ describe('AvaxP permissionlessValidatorTxBuilder', () => {
       txExplain.inputs[0].id.should.equal('WyjYJHa7Ye1KMsBZiQ8hQJzY7YYxTJTTyMkxcVrKRDiNytTY8:0');
       txExplain.inputs[1].id.should.equal('WyjYJHa7Ye1KMsBZiQ8hQJzY7YYxTJTTyMkxcVrKRDiNytTY8:1');
       txExplain.inputs[2].id.should.equal('s92SjoZQemgG97HocX9GgyFy6ZKmapgcgqQ3y5J2uwP3qWBUy:0');
+      txExplain.fee.fee.should.equal('1000000');
       assert(txJson.outputs[0].value === testData.BUILD_AND_SIGN_ADD_PERMISSIONLESS_VALIDATOR_SAMPLE.stakeAmount);
       tx.type.should.equal(TransactionType.AddPermissionlessValidator);
       console.log(tx.toBroadcastFormat());