diff --git a/contracts/exchange/test/balance_stores/local_balance_store.ts b/contracts/exchange/test/balance_stores/local_balance_store.ts
index 930075e76c..39f7692000 100644
--- a/contracts/exchange/test/balance_stores/local_balance_store.ts
+++ b/contracts/exchange/test/balance_stores/local_balance_store.ts
@@ -1,4 +1,4 @@
-import { constants } from '@0x/contracts-test-utils';
+import { constants, Numberish } from '@0x/contracts-test-utils';
 import { assetDataUtils } from '@0x/order-utils';
 import { AssetProxyId } from '@0x/types';
 import { BigNumber } from '@0x/utils';
@@ -37,7 +37,7 @@ export class LocalBalanceStore extends BalanceStore {
      * @param senderAddress Address whose ETH balance to decrease.
      * @param amount Amount to decrease the balance by.
      */
-    public burnGas(senderAddress: string, amount: BigNumber | number): void {
+    public burnGas(senderAddress: string, amount: Numberish): void {
         this._balances.eth[senderAddress] = this._balances.eth[senderAddress].minus(amount);
     }
 
@@ -47,7 +47,7 @@ export class LocalBalanceStore extends BalanceStore {
      * @param toAddress Receiver of ETH.
      * @param amount Amount of ETH to transfer.
      */
-    public sendEth(fromAddress: string, toAddress: string, amount: BigNumber | number): void {
+    public sendEth(fromAddress: string, toAddress: string, amount: Numberish): void {
         this._balances.eth[fromAddress] = this._balances.eth[fromAddress].minus(amount);
         this._balances.eth[toAddress] = this._balances.eth[toAddress].plus(amount);
     }
diff --git a/contracts/integrations/test/coordinator/coordinator.ts b/contracts/integrations/test/coordinator/coordinator.ts
index f1d7dbba52..8ae1f08cc5 100644
--- a/contracts/integrations/test/coordinator/coordinator.ts
+++ b/contracts/integrations/test/coordinator/coordinator.ts
@@ -251,7 +251,7 @@ blockchainTests.resets('Coordinator tests', env => {
                     transactionHash,
                     feeRecipient.address,
                 );
-                expect(tx).to.revertWith(expectedError);
+                return expect(tx).to.revertWith(expectedError);
             });
             it(`${fnName} should revert with an invalid approval signature`, async () => {
                 const approvalSignature = hexConcat(
@@ -272,7 +272,7 @@ blockchainTests.resets('Coordinator tests', env => {
                     transactionHash,
                     feeRecipient.address,
                 );
-                expect(tx).to.revertWith(expectedError);
+                return expect(tx).to.revertWith(expectedError);
             });
             it(`${fnName} should revert if not called by tx signer or approver`, async () => {
                 const tx = coordinator.executeTransaction.awaitTransactionSuccessAsync(
@@ -284,7 +284,7 @@ blockchainTests.resets('Coordinator tests', env => {
                 );
 
                 const expectedError = new CoordinatorRevertErrors.InvalidOriginError(taker.address);
-                expect(tx).to.revertWith(expectedError);
+                return expect(tx).to.revertWith(expectedError);
             });
         }
     });
@@ -371,7 +371,7 @@ blockchainTests.resets('Coordinator tests', env => {
                     transactionHash,
                     feeRecipient.address,
                 );
-                expect(tx).to.revertWith(expectedError);
+                return expect(tx).to.revertWith(expectedError);
             });
             it(`${fnName} should revert if not called by tx signer or approver`, async () => {
                 const tx = coordinator.executeTransaction.awaitTransactionSuccessAsync(
@@ -382,7 +382,7 @@ blockchainTests.resets('Coordinator tests', env => {
                     { from: maker.address, value: DeploymentManager.protocolFee.times(orders.length) },
                 );
                 const expectedError = new CoordinatorRevertErrors.InvalidOriginError(taker.address);
-                expect(tx).to.revertWith(expectedError);
+                return expect(tx).to.revertWith(expectedError);
             });
         }
     });
diff --git a/contracts/integrations/test/utils/deployment_manager.ts b/contracts/integrations/test/utils/deployment_manager.ts
index 38ff3a85b7..ae3a9ad32a 100644
--- a/contracts/integrations/test/utils/deployment_manager.ts
+++ b/contracts/integrations/test/utils/deployment_manager.ts
@@ -123,7 +123,7 @@ export interface DeploymentOptions {
 
 export class DeploymentManager {
     public static readonly protocolFeeMultiplier = new BigNumber(150000);
-    public static readonly gasPrice = new BigNumber(1000000000); // 1 Gwei
+    public static readonly gasPrice = new BigNumber(1e9); // 1 Gwei
     public static readonly protocolFee = DeploymentManager.gasPrice.times(DeploymentManager.protocolFeeMultiplier);
 
     /**