Merge pull request #1437 from 0xProject/feature/instant/tell-amount-available

[instant] Tell user how much of an asset is available

1 files changed, 26 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..9c7c244af
--- /dev/null
+++ b/packages/asset-buyer/test/utils/test_helpers.ts
@@ -0,0 +1,26 @@
+import { BigNumber } from '@0x/utils';
+
+import { InsufficientAssetLiquidityError } from '../../src/errors';
+
+export const testHelpers = {
+    expectInsufficientLiquidityError: (
+        expect: Chai.ExpectStatic,
+        functionWhichTriggersError: () => void,
+        expectedAmountAvailableToFill?: BigNumber,
+    ): void => {
+        let wasErrorThrown = false;
+        try {
+            functionWhichTriggersError();
+        } catch (e) {
+            wasErrorThrown = true;
+            expect(e).to.be.instanceOf(InsufficientAssetLiquidityError);
+            if (expectedAmountAvailableToFill) {
+                expect(e.amountAvailableToFill).to.be.bignumber.equal(expectedAmountAvailableToFill);
+            } else {
+                expect(e.amountAvailableToFill).to.be.undefined();
+            }
+        }
+
+        expect(wasErrorThrown).to.be.true();
+    },
+};