From c12e48d28a811ace4bf7543a5c06471170ddf3f9 Mon Sep 17 00:00:00 2001
From: Fabio Berger <me@fabioberger.com>
Date: Wed, 23 Aug 2017 18:13:50 +0200
Subject: Add assertion to public method

---
 src/contract_wrappers/token_registry_wrapper.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/contract_wrappers/token_registry_wrapper.ts b/src/contract_wrappers/token_registry_wrapper.ts
index c78b86a88..c106a4a40 100644
--- a/src/contract_wrappers/token_registry_wrapper.ts
+++ b/src/contract_wrappers/token_registry_wrapper.ts
@@ -1,5 +1,6 @@
 import * as _ from 'lodash';
 import {Web3Wrapper} from '../web3_wrapper';
+import {assert} from '../utils/assert';
 import {Token, TokenRegistryContract, TokenMetadata} from '../types';
 import {constants} from '../utils/constants';
 import {ContractWrapper} from './contract_wrapper';
@@ -33,6 +34,8 @@ export class TokenRegistryWrapper extends ContractWrapper {
      * @return  An object that conforms to the Token interface or undefined if token not found.
      */
     public async getTokenMetadataIfExistsAsync(address: string): Promise<Token|undefined> {
+        assert.isETHAddressHex('address', address);
+
         const tokenRegistryContract = await this._getTokenRegistryContractAsync();
         const metadata = await tokenRegistryContract.getTokenMetaData.call(address);
         if (metadata[0] === constants.NULL_ADDRESS) {
-- 
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