3 files changed, 27 insertions, 2 deletions
diff --git a/packages/contracts/src/utils/assertions.ts b/packages/contracts/src/utils/assertions.ts
new file mode 100644
index 000000000..72c2734d8
--- /dev/null
+++ b/packages/contracts/src/utils/assertions.ts
@@ -0,0 +1,20 @@
+import * as chai from 'chai';
+import * as _ from 'lodash';
+
+import { constants } from './constants';
+
+const expect = chai.expect;
+
+// throws if the given promise does not reject with one of two expected error
+// messages.
+export const expectRevertOrAlwaysFailingTransaction = <T>(p: Promise<T>) => {
+    return expect(p)
+        .to.be.rejected()
+        .then(e => {
+            expect(e).to.satisfy(
+                (err: Error) =>
+                    _.includes(err.message, constants.REVERT) ||
+                    _.includes(err.message, constants.ALWAYS_FAILING_TRANSACTION),
+            );
+        });
+};
diff --git a/packages/contracts/src/utils/constants.ts b/packages/contracts/src/utils/constants.ts
index 9b0b92545..144e22bc2 100644
--- a/packages/contracts/src/utils/constants.ts
+++ b/packages/contracts/src/utils/constants.ts
@@ -19,6 +19,7 @@ const TESTRPC_PRIVATE_KEYS_STRINGS = [
 export const constants = {
     INVALID_OPCODE: 'invalid opcode',
     REVERT: 'revert',
+    ALWAYS_FAILING_TRANSACTION: 'always failing transaction',
     TESTRPC_NETWORK_ID: 50,
     AWAIT_TRANSACTION_MINED_MS: 100,
     MAX_ETHERTOKEN_WITHDRAW_GAS: 43000,
diff --git a/packages/contracts/src/utils/web3_wrapper.ts b/packages/contracts/src/utils/web3_wrapper.ts
index 1049ab967..a89d7e8d0 100644
--- a/packages/contracts/src/utils/web3_wrapper.ts
+++ b/packages/contracts/src/utils/web3_wrapper.ts
@@ -7,13 +7,17 @@ import { coverage } from './coverage';
 
 export const txDefaults = {
     from: devConstants.TESTRPC_FIRST_ADDRESS,
-    gas: devConstants.GAS_LIMIT,
+    // gas: devConstants.GAS_LIMIT,
+};
+const providerConfigs = {
+    shouldUseInProcessGanache: false,
+    rpcUrl: 'http://localhost:8501',
 };
-const providerConfigs = { shouldUseInProcessGanache: true };
 export const provider = web3Factory.getRpcProvider(providerConfigs);
 const isCoverageEnabled = env.parseBoolean(EnvVars.SolidityCoverage);
 if (isCoverageEnabled) {
     const coverageSubprovider = coverage.getCoverageSubproviderSingleton();
     prependSubprovider(provider, coverageSubprovider);
 }
+
 export const web3Wrapper = new Web3Wrapper(provider);