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-rw-r--r--packages/contracts/src/utils/assertions.ts20
1 files changed, 20 insertions, 0 deletions
diff --git a/packages/contracts/src/utils/assertions.ts b/packages/contracts/src/utils/assertions.ts
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index 000000000..72c2734d8
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+++ 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),
+ );
+ });
+};