1 files changed, 22 insertions, 0 deletions
diff --git a/packages/asset-buyer/test/utils/test_helpers.ts b/packages/asset-buyer/test/utils/test_helpers.ts
new file mode 100644
index 000000000..fd1313ac8
--- /dev/null
+++ b/packages/asset-buyer/test/utils/test_helpers.ts
@@ -0,0 +1,22 @@
+import { BigNumber } from '@0x/utils';
+
+import { InsufficientAssetLiquidityError } from '../../src/types';
+
+export const testHelpers = {
+    expectInsufficientLiquidityError: (
+        expect: Chai.ExpectStatic,
+        functionWhichTriggersError: () => void,
+        expectedNumAvailable: BigNumber,
+    ): void => {
+        let errorThrown = false;
+        try {
+            functionWhichTriggersError();
+        } catch (e) {
+            errorThrown = true;
+            expect(e).to.be.instanceOf(InsufficientAssetLiquidityError);
+            expect(e.numAssetsAvailable).to.be.bignumber.equal(expectedNumAvailable);
+        }
+
+        expect(errorThrown).to.be.true();
+    },
+};