1 files changed, 119 insertions, 0 deletions
diff --git a/packages/contract-wrappers/test/exchange_transfer_simulator_test.ts b/packages/contract-wrappers/test/exchange_transfer_simulator_test.ts
new file mode 100644
index 000000000..b4ea91181
--- /dev/null
+++ b/packages/contract-wrappers/test/exchange_transfer_simulator_test.ts
@@ -0,0 +1,119 @@
+import { BlockchainLifecycle, devConstants } from '@0xproject/dev-utils';
+import { BlockParamLiteral, Token } from '@0xproject/types';
+import { BigNumber } from '@0xproject/utils';
+import * as chai from 'chai';
+
+import { ContractWrappers, ExchangeContractErrs } from '../src';
+import { TradeSide, TransferType } from '../src/types';
+import { ExchangeTransferSimulator } from '../src/utils/exchange_transfer_simulator';
+
+import { chaiSetup } from './utils/chai_setup';
+import { constants } from './utils/constants';
+import { provider, web3Wrapper } from './utils/web3_wrapper';
+
+chaiSetup.configure();
+const expect = chai.expect;
+const blockchainLifecycle = new BlockchainLifecycle(web3Wrapper);
+
+describe('ExchangeTransferSimulator', () => {
+    const config = {
+        networkId: constants.TESTRPC_NETWORK_ID,
+    };
+    const contractWrappers = new ContractWrappers(provider, config);
+    const transferAmount = new BigNumber(5);
+    let userAddresses: string[];
+    let tokens: Token[];
+    let coinbase: string;
+    let sender: string;
+    let recipient: string;
+    let exampleTokenAddress: string;
+    let exchangeTransferSimulator: ExchangeTransferSimulator;
+    let txHash: string;
+    before(async () => {
+        userAddresses = await web3Wrapper.getAvailableAddressesAsync();
+        [coinbase, sender, recipient] = userAddresses;
+        tokens = await contractWrappers.tokenRegistry.getTokensAsync();
+        exampleTokenAddress = tokens[0].address;
+    });
+    beforeEach(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    afterEach(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
+    describe('#transferFromAsync', () => {
+        beforeEach(() => {
+            exchangeTransferSimulator = new ExchangeTransferSimulator(contractWrappers.token, BlockParamLiteral.Latest);
+        });
+        it("throws if the user doesn't have enough allowance", async () => {
+            return expect(
+                exchangeTransferSimulator.transferFromAsync(
+                    exampleTokenAddress,
+                    sender,
+                    recipient,
+                    transferAmount,
+                    TradeSide.Taker,
+                    TransferType.Trade,
+                ),
+            ).to.be.rejectedWith(ExchangeContractErrs.InsufficientTakerAllowance);
+        });
+        it("throws if the user doesn't have enough balance", async () => {
+            txHash = await contractWrappers.token.setProxyAllowanceAsync(exampleTokenAddress, sender, transferAmount);
+            await web3Wrapper.awaitTransactionMinedAsync(txHash);
+            return expect(
+                exchangeTransferSimulator.transferFromAsync(
+                    exampleTokenAddress,
+                    sender,
+                    recipient,
+                    transferAmount,
+                    TradeSide.Maker,
+                    TransferType.Trade,
+                ),
+            ).to.be.rejectedWith(ExchangeContractErrs.InsufficientMakerBalance);
+        });
+        it('updates balances and proxyAllowance after transfer', async () => {
+            txHash = await contractWrappers.token.transferAsync(exampleTokenAddress, coinbase, sender, transferAmount);
+            await web3Wrapper.awaitTransactionMinedAsync(txHash);
+            txHash = await contractWrappers.token.setProxyAllowanceAsync(exampleTokenAddress, sender, transferAmount);
+            await web3Wrapper.awaitTransactionMinedAsync(txHash);
+            await exchangeTransferSimulator.transferFromAsync(
+                exampleTokenAddress,
+                sender,
+                recipient,
+                transferAmount,
+                TradeSide.Taker,
+                TransferType.Trade,
+            );
+            const store = (exchangeTransferSimulator as any)._store;
+            const senderBalance = await store.getBalanceAsync(exampleTokenAddress, sender);
+            const recipientBalance = await store.getBalanceAsync(exampleTokenAddress, recipient);
+            const senderProxyAllowance = await store.getProxyAllowanceAsync(exampleTokenAddress, sender);
+            expect(senderBalance).to.be.bignumber.equal(0);
+            expect(recipientBalance).to.be.bignumber.equal(transferAmount);
+            expect(senderProxyAllowance).to.be.bignumber.equal(0);
+        });
+        it("doesn't update proxyAllowance after transfer if unlimited", async () => {
+            txHash = await contractWrappers.token.transferAsync(exampleTokenAddress, coinbase, sender, transferAmount);
+            await web3Wrapper.awaitTransactionMinedAsync(txHash);
+            txHash = await contractWrappers.token.setUnlimitedProxyAllowanceAsync(exampleTokenAddress, sender);
+            await web3Wrapper.awaitTransactionMinedAsync(txHash);
+            await exchangeTransferSimulator.transferFromAsync(
+                exampleTokenAddress,
+                sender,
+                recipient,
+                transferAmount,
+                TradeSide.Taker,
+                TransferType.Trade,
+            );
+            const store = (exchangeTransferSimulator as any)._store;
+            const senderBalance = await store.getBalanceAsync(exampleTokenAddress, sender);
+            const recipientBalance = await store.getBalanceAsync(exampleTokenAddress, recipient);
+            const senderProxyAllowance = await store.getProxyAllowanceAsync(exampleTokenAddress, sender);
+            expect(senderBalance).to.be.bignumber.equal(0);
+            expect(recipientBalance).to.be.bignumber.equal(transferAmount);
+            expect(senderProxyAllowance).to.be.bignumber.equal(
+                contractWrappers.token.UNLIMITED_ALLOWANCE_IN_BASE_UNITS,
+            );
+        });
+    });
+});