test(sdk-coin-arbeth): add testcases for arbeth

WIN-1095
TICKET: WIN-1095

modules/sdk-coin-arbeth/src/lib/transferBuilder.ts

@@ -1,8 +1,23 @@
 import { TransferBuilder as EthTransferBuilder } from '@bitgo/abstract-eth';
 
 export class TransferBuilder extends EthTransferBuilder {
-  /** @inheritdoc */
+  /**
+   * Get the prefix used in generating an operation hash for sending native coins
+   * See https://github.com/BitGo/eth-multisig-v4/blob/master/contracts/coins/ArbethWalletSimple.sol
+   *
+   * @returns the string prefix
+   */
   protected getNativeOperationHashPrefix(): string {
     return 'ARBETH';
   }
+
+  /**
+   * Get the prefix used in generating an operation hash for sending tokens
+   * See https://github.com/BitGo/eth-multisig-v4/blob/master/contracts/coins/ArbethWalletSimple.sol
+   *
+   * @returns the string prefix
+   */
+  protected getTokenOperationHashPrefix(): string {
+    return 'ARBETH-ERC20';
+  }
 }

modules/sdk-coin-arbeth/src/register.ts

@@ -1,8 +1,12 @@
 import { BitGoBase } from '@bitgo/sdk-core';
 import { Arbeth } from './arbeth';
 import { Tarbeth } from './tarbeth';
+import { ArbethToken } from './arbethToken';
 
 export const register = (sdk: BitGoBase): void => {
   sdk.register('arbeth', Arbeth.createInstance);
   sdk.register('tarbeth', Tarbeth.createInstance);
+  ArbethToken.createTokenConstructors().forEach(({ name, coinConstructor }) => {
+    sdk.register(name, coinConstructor);
+  });
 };

modules/sdk-coin-arbeth/test/getBuilder.ts

@@ -0,0 +1,7 @@
+import { BaseBuilder } from '@bitgo/sdk-core';
+import { coins } from '@bitgo/statics';
+import { TransactionBuilder } from '../src';
+
+export function getBuilder(coinName: string): BaseBuilder {
+  return new TransactionBuilder(coins.get(coinName));
+}