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diff --git a/packages/taler-harness/src/integrationtests/test-payment-fault.ts b/packages/taler-harness/src/integrationtests/test-payment-fault.ts
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+++ b/packages/taler-harness/src/integrationtests/test-payment-fault.ts
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+/*
+ This file is part of GNU Taler
+ (C) 2020 Taler Systems S.A.
+
+ GNU Taler is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Sample fault injection test.
+ */
+
+/**
+ * Imports.
+ */
+import { ConfirmPayResultType, MerchantApiClient } from "@gnu-taler/taler-util";
+import { WalletApiOperation } from "@gnu-taler/taler-wallet-core";
+import { defaultCoinConfig } from "../harness/denomStructures.js";
+import {
+  FaultInjectedExchangeService,
+  FaultInjectionRequestContext,
+  FaultInjectionResponseContext,
+} from "../harness/faultInjection.js";
+import {
+  BankService,
+  ExchangeService,
+  GlobalTestState,
+  MerchantService,
+  generateRandomPayto,
+  setupDb,
+} from "../harness/harness.js";
+import {
+  createWalletDaemonWithClient,
+  withdrawViaBankV2,
+} from "../harness/helpers.js";
+
+/**
+ * Run test for basic, bank-integrated withdrawal.
+ */
+export async function runPaymentFaultTest(t: GlobalTestState) {
+  // Set up test environment
+
+  const db = await setupDb(t);
+
+  const bank = await BankService.create(t, {
+    allowRegistrations: true,
+    currency: "TESTKUDOS",
+    database: db.connStr,
+    httpPort: 8082,
+  });
+
+  const exchange = ExchangeService.create(t, {
+    name: "testexchange-1",
+    currency: "TESTKUDOS",
+    httpPort: 8081,
+    database: db.connStr,
+  });
+
+  const exchangeBankAccount = await bank.createExchangeAccount(
+    "myexchange",
+    "x",
+  );
+
+  const faultyExchange = new FaultInjectedExchangeService(t, exchange, 8091);
+  // Base URL must contain port that the proxy is listening on.
+  await exchange.modifyConfig(async (config) => {
+    config.setString("exchange", "base_url", "http://localhost:8091/");
+  });
+
+  bank.setSuggestedExchange(
+    faultyExchange,
+    exchangeBankAccount.accountPaytoUri,
+  );
+
+  await bank.start();
+
+  await bank.pingUntilAvailable();
+
+  await exchange.addBankAccount("1", exchangeBankAccount);
+  exchange.addOfferedCoins(defaultCoinConfig);
+
+  await exchange.start();
+  await exchange.pingUntilAvailable();
+
+  // Print all requests to the exchange
+  faultyExchange.faultProxy.addFault({
+    async modifyRequest(ctx: FaultInjectionRequestContext) {
+      console.log("got request", ctx);
+    },
+    async modifyResponse(ctx: FaultInjectionResponseContext) {
+      console.log("got response", ctx);
+    },
+  });
+
+  const merchant = await MerchantService.create(t, {
+    name: "testmerchant-1",
+    currency: "TESTKUDOS",
+    httpPort: 8083,
+    database: db.connStr,
+  });
+
+  merchant.addExchange(faultyExchange);
+
+  await merchant.start();
+  await merchant.pingUntilAvailable();
+
+  await merchant.addInstanceWithWireAccount({
+    id: "default",
+    name: "Default Instance",
+    paytoUris: [generateRandomPayto("merchant-default")],
+  });
+
+  const merchantClient = new MerchantApiClient(merchant.makeInstanceBaseUrl());
+
+  console.log("setup done!");
+
+  const { walletClient } = await createWalletDaemonWithClient(t, {
+    name: "default",
+  });
+
+  await walletClient.call(WalletApiOperation.GetBalances, {});
+
+  const wres = await withdrawViaBankV2(t, {
+    walletClient,
+    bank,
+    exchange: faultyExchange,
+    amount: "TESTKUDOS:20",
+  });
+
+  await wres.withdrawalFinishedCond;
+
+  // Set up order.
+
+  const orderResp = await merchantClient.createOrder({
+    order: {
+      summary: "Buy me!",
+      amount: "TESTKUDOS:5",
+      fulfillment_url: "taler://fulfillment-success/thx",
+    },
+  });
+
+  let orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "unpaid");
+
+  // Make wallet pay for the order
+
+  const prepResp = await walletClient.call(
+    WalletApiOperation.PreparePayForUri,
+    {
+      talerPayUri: orderStatus.taler_pay_uri,
+    },
+  );
+
+  // Drop 3 responses from the exchange.
+  let faultCount = 0;
+  faultyExchange.faultProxy.addFault({
+    async modifyResponse(ctx: FaultInjectionResponseContext) {
+      console.log(`in modifyResponse for ${ctx.request.requestUrl}`);
+      if (
+        !ctx.request.requestUrl.endsWith("/deposit") &&
+        !ctx.request.requestUrl.endsWith("/batch-deposit")
+      ) {
+        return;
+      }
+      if (faultCount < 3) {
+        console.log(`blocking /deposit request #${faultCount}`);
+        faultCount++;
+        ctx.dropResponse = true;
+      } else {
+        console.log(`letting through /deposit request #${faultCount}`);
+      }
+    },
+  });
+
+  // confirmPay won't work, as the exchange is unreachable
+
+  const confirmPayResp = await walletClient.call(
+    WalletApiOperation.ConfirmPay,
+    {
+      transactionId: prepResp.transactionId,
+    },
+  );
+
+  t.assertDeepEqual(confirmPayResp.type, ConfirmPayResultType.Pending);
+
+  await walletClient.call(WalletApiOperation.TestingWaitTransactionsFinal, {});
+
+  // Check if payment was successful.
+
+  orderStatus = await merchantClient.queryPrivateOrderStatus({
+    orderId: orderResp.order_id,
+  });
+
+  t.assertTrue(orderStatus.order_status === "paid");
+}
+
+runPaymentFaultTest.suites = ["wallet"];
+runPaymentFaultTest.timeoutMs = 120000;