@0x:contracts-staking Addressed review comments

contracts/test-utils/src/hex_utils.ts

@@ -44,6 +44,14 @@ export function hexInvert(n: string | BigNumber | number, size: number = WORD_LE
     return ethUtil.bufferToHex(Buffer.from(buf.map(b => ~b)));
 }
 
+/**
+ * Slices off the desired number of bytes from a hex number.
+ */
+export function hexSlice(n: string | BigNumber | number, size: number): string {
+    const hex = toHex(n);
+    return '0x'.concat(toHex(n).slice(size * 2 + 2, hex.length));
+}
+
 /**
  * Convert a string, a number, or a BigNumber into a hex string.
  * Works with negative numbers, as well.

contracts/test-utils/src/index.ts

@@ -28,7 +28,7 @@ export { bytes32Values, testCombinatoriallyWithReferenceFunc, uint256Values } fr
 export { TransactionFactory } from './transaction_factory';
 export { MutatorContractFunction, TransactionHelper } from './transaction_helper';
 export { testWithReferenceFuncAsync } from './test_with_reference';
-export { hexConcat, hexLeftPad, hexInvert, hexRandom, hexRightPad, toHex } from './hex_utils';
+export { hexConcat, hexLeftPad, hexInvert, hexSlice, hexRandom, hexRightPad, toHex } from './hex_utils';
 export {
     BatchMatchOrder,
     ContractName,