Add tests for batchCancelAsync

2 files changed, 3 insertions, 3 deletions

diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index b0c4295f1..fec75e6df 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -212,7 +212,7 @@ export class ExchangeWrapper extends ContractWrapper {
         orders: Array<Order|SignedOrder>, takerTokenCancelAmounts: BigNumber.BigNumber[]): Promise<void> {
         const makers = _.map(orders, order => order.maker);
         assert.isSameLength('orders', orders, 'takerTokenCancelAmounts', takerTokenCancelAmounts);
-        assert.assert(_.isEmpty(orders), 'Can not cancel an empty batch');
+        assert.assert(!_.isEmpty(orders), 'Can not cancel an empty batch');
         assert.assert(_.uniq(makers).length === 1, 'Can not cancel orders from multiple makers in a single batch');
         const maker = makers[0];
         // _.zip doesn't type check if values have different types :'(
diff --git a/src/utils/assert.ts b/src/utils/assert.ts
index 3842185bb..61b7527e6 100644
--- a/src/utils/assert.ts
+++ b/src/utils/assert.ts
@@ -45,8 +45,8 @@ export const assert = {
     isSameLength(variableName1: string, value1: any[], variableName2: string, value2: any[]) {
         const length1 = value1.length;
         const length2 = value2.length;
-        this.assert(length1 === length2, `${variableName1} and ${variableName2} length mismatch.
-        ${length1} != ${length2}`);
+        this.assert(length1 === length2, `${variableName1} and ${variableName2} length mismatch. \
+${length1} != ${length2}`);
     },
     isNumber(variableName: string, value: number): void {
         this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value));