2 files changed, 49 insertions, 2 deletions
diff --git a/packages/instant/test/util/asset.test.ts b/packages/instant/test/util/asset.test.ts
index 4229b24ed..fc4e4e2e4 100644
--- a/packages/instant/test/util/asset.test.ts
+++ b/packages/instant/test/util/asset.test.ts
@@ -1,6 +1,7 @@
+import { AssetBuyerError } from '@0x/asset-buyer';
 import { AssetProxyId, ObjectMap } from '@0x/types';
 
-import { Asset, AssetMetaData, ERC20AssetMetaData, Network, ZeroExInstantError } from '../../src/types';
+import { Asset, AssetMetaData, ERC20Asset, ERC20AssetMetaData, Network, ZeroExInstantError } from '../../src/types';
 import { assetUtils } from '../../src/util/asset';
 
 const ZRX_ASSET_DATA = '0xf47261b0000000000000000000000000e41d2489571d322189246dafa5ebde1f4699f498';
@@ -11,7 +12,7 @@ const ZRX_META_DATA: ERC20AssetMetaData = {
     decimals: 18,
     name: '0x',
 };
-const ZRX_ASSET: Asset = {
+const ZRX_ASSET: ERC20Asset = {
     assetData: ZRX_ASSET_DATA,
     metaData: ZRX_META_DATA,
 };
@@ -45,4 +46,32 @@ describe('assetDataUtil', () => {
             ).toThrowError(ZeroExInstantError.AssetMetaDataNotAvailable);
         });
     });
+    describe('assetBuyerErrorMessage', () => {
+        it('should return message for InsufficientAssetLiquidity', () => {
+            const insufficientAssetError = new Error(AssetBuyerError.InsufficientAssetLiquidity);
+            expect(assetUtils.assetBuyerErrorMessage(ZRX_ASSET, insufficientAssetError)).toEqual(
+                'Not enough ZRX available',
+            );
+        });
+        it('should return message for InsufficientAssetLiquidity', () => {
+            const insufficientZrxError = new Error(AssetBuyerError.InsufficientZrxLiquidity);
+            expect(assetUtils.assetBuyerErrorMessage(ZRX_ASSET, insufficientZrxError)).toEqual(
+                'Not enough ZRX available',
+            );
+        });
+        it('should message for StandardRelayerApiError', () => {
+            const standardRelayerError = new Error(AssetBuyerError.StandardRelayerApiError);
+            expect(assetUtils.assetBuyerErrorMessage(ZRX_ASSET, standardRelayerError)).toEqual(
+                'ZRX is currently unavailable',
+            );
+        });
+        it('should return error for AssetUnavailable error', () => {
+            const assetUnavailableError = new Error(
+                `${AssetBuyerError.AssetUnavailable}: For assetData ${ZRX_ASSET_DATA}`,
+            );
+            expect(assetUtils.assetBuyerErrorMessage(ZRX_ASSET, assetUnavailableError)).toEqual(
+                'ZRX is currently unavailable',
+            );
+        });
+    });
 });
diff --git a/packages/instant/test/util/format.test.ts b/packages/instant/test/util/format.test.ts
index fe0a63e6e..38bf356ec 100644
--- a/packages/instant/test/util/format.test.ts
+++ b/packages/instant/test/util/format.test.ts
@@ -41,6 +41,18 @@ describe('format', () => {
         it('converts BigNumber(5.3014059295032) to the string `5.301 ETH`', () => {
             expect(format.ethUnitAmount(BIG_NUMBER_IRRATIONAL)).toBe('5.301 ETH');
         });
+        it('shows 1 significant digit when rounded amount would be 0', () => {
+            expect(format.ethUnitAmount(new BigNumber(0.00003))).toBe('0.00003 ETH');
+            expect(format.ethUnitAmount(new BigNumber(0.000034))).toBe('0.00003 ETH');
+            expect(format.ethUnitAmount(new BigNumber(0.000035))).toBe('0.00004 ETH');
+        });
+        it('shows < 0.00001 when hits threshold', () => {
+            expect(format.ethUnitAmount(new BigNumber(0.000011))).toBe('0.00001 ETH');
+            expect(format.ethUnitAmount(new BigNumber(0.00001))).toBe('0.00001 ETH');
+            expect(format.ethUnitAmount(new BigNumber(0.000009))).toBe('< 0.00001 ETH');
+            expect(format.ethUnitAmount(new BigNumber(0.0000000009))).toBe('< 0.00001 ETH');
+            expect(format.ethUnitAmount(new BigNumber(0))).toBe('0 ETH');
+        });
         it('returns defaultText param when ethUnitAmount is not defined', () => {
             const defaultText = 'defaultText';
             expect(format.ethUnitAmount(undefined, 4, defaultText)).toBe(defaultText);
@@ -86,6 +98,12 @@ describe('format', () => {
         it('correctly formats 5.3014059295032 ETH to usd according to some price', () => {
             expect(format.ethUnitAmountInUsd(BIG_NUMBER_IRRATIONAL, BIG_NUMBER_FAKE_ETH_USD_PRICE)).toBe('$13.43');
         });
+        it('correctly formats amount that is less than 1 cent', () => {
+            expect(format.ethUnitAmountInUsd(new BigNumber(0.000001), BIG_NUMBER_FAKE_ETH_USD_PRICE)).toBe('<$0.01');
+        });
+        it('correctly formats exactly 1 cent', () => {
+            expect(format.ethUnitAmountInUsd(new BigNumber(0.0039), BIG_NUMBER_FAKE_ETH_USD_PRICE)).toBe('$0.01');
+        });
         it('returns defaultText param when ethUnitAmountInUsd or ethUsdPrice is not defined', () => {
             const defaultText = 'defaultText';
             expect(format.ethUnitAmountInUsd(undefined, undefined, 2, defaultText)).toBe(defaultText);