2 files changed, 9 insertions, 0 deletions
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index 406f2b149..5a31e1b16 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -1,6 +1,7 @@
 import * as _ from 'lodash';
 import * as BigNumber from 'bignumber.js';
 import * as Web3 from 'web3';
+import {Web3Wrapper} from '../web3_wrapper';
 import {SchemaValidator} from './schema_validator';
 import {utils} from './utils';
 
@@ -25,6 +26,11 @@ export const assert = {
         const web3 = new Web3();
         this.assert(web3.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value));
     },
+    async isSenderAddressAvailableAsync(web3Wrapper: Web3Wrapper, senderAddress: string) {
+        const isSenderAddressAvailable = await web3Wrapper.isSenderAddressAvailableAsync(senderAddress);
+        assert.assert(isSenderAddressAvailable, 'Specified senderAddress isn\'t available through the \
+                                                 supplied web3 instance');
+    },
     isNumber(variableName: string, value: number): void {
         this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value));
     },
diff --git a/src/utils/utils.ts b/src/utils/utils.ts
index e6840a624..114b46f6c 100644
--- a/src/utils/utils.ts
+++ b/src/utils/utils.ts
@@ -22,4 +22,7 @@ export const utils = {
         const isValid = /^0x[0-9A-F]{64}$/i.test(orderHashHex);
         return isValid;
     },
+    spawnSwitchErr(name: string, value: any) {
+        return new Error(`Unexpected switch value: ${value} encountered for ${name}`);
+    },
 };