Remove isUserAddressAvailable assertion from getBalanceAsync and add regression test

2 files changed, 25 insertions, 1 deletions

diff --git a/src/contract_wrappers/token_wrapper.ts b/src/contract_wrappers/token_wrapper.ts
index 9c073f30b..477daec59 100644
--- a/src/contract_wrappers/token_wrapper.ts
+++ b/src/contract_wrappers/token_wrapper.ts
@@ -45,7 +45,6 @@ export class TokenWrapper extends ContractWrapper {
     public async getBalanceAsync(tokenAddress: string, ownerAddress: string): Promise<BigNumber.BigNumber> {
         assert.isETHAddressHex('ownerAddress', ownerAddress);
         assert.isETHAddressHex('tokenAddress', tokenAddress);
-        await assert.isUserAddressAvailableAsync(this._web3Wrapper);
 
         const tokenContract = await this._getTokenContractAsync(tokenAddress);
         let balance = await tokenContract.balanceOf.call(ownerAddress);
diff --git a/src/subproviders/empty_wallet_subprovider.ts b/src/subproviders/empty_wallet_subprovider.ts
new file mode 100644
index 000000000..40d3d418d
--- /dev/null
+++ b/src/subproviders/empty_wallet_subprovider.ts
@@ -0,0 +1,25 @@
+import * as _ from 'lodash';
+import Web3 = require('web3');
+
+/*
+ * This class implements the web3-provider-engine subprovider interface and returns
+ * that the provider has no addresses when queried.
+ * Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
+ */
+export class EmptyWalletSubProvider {
+    public handleRequest(payload: any, next: () => void, end: (err: Error|null, result: any) => void) {
+        switch (payload.method) {
+            case 'eth_accounts':
+                end(null, []);
+                return;
+
+            default:
+                next();
+                return;
+        }
+    }
+    // Required to implement this method despite not needing it for this subprovider
+    public setEngine(engine: any) {
+        // noop
+    }
+}