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diff --git a/src/util/reserveHistoryUtil-test.ts b/src/util/reserveHistoryUtil-test.ts
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+++ b/src/util/reserveHistoryUtil-test.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/>
+ */
+
+/**
+ * Imports.
+ */
+import test from "ava";
+import {
+  reconcileReserveHistory,
+  summarizeReserveHistory,
+} from "./reserveHistoryUtil";
+import {
+  WalletReserveHistoryItem,
+  WalletReserveHistoryItemType,
+} from "../types/dbTypes";
+import {
+  ReserveTransaction,
+  ReserveTransactionType,
+} from "../types/ReserveTransaction";
+import { Amounts } from "./amounts";
+
+test("basics", (t) => {
+  const r = reconcileReserveHistory([], []);
+  t.deepEqual(r.updatedLocalHistory, []);
+});
+
+test("unmatched credit", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  t.deepEqual(r.updatedLocalHistory.length, 1);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:100");
+  t.deepEqual(Amounts.stringify(s.awaitedReserveAmount), "TESTKUDOS:0");
+  t.deepEqual(Amounts.stringify(s.unclaimedReserveAmount), "TESTKUDOS:100");
+});
+
+test("unmatched credit #2", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:50",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC02",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  t.deepEqual(r.updatedLocalHistory.length, 2);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:150");
+  t.deepEqual(Amounts.stringify(s.awaitedReserveAmount), "TESTKUDOS:0");
+  t.deepEqual(Amounts.stringify(s.unclaimedReserveAmount), "TESTKUDOS:150");
+});
+
+test("matched credit", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [
+    {
+      type: WalletReserveHistoryItemType.Credit,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:100"),
+      matchedExchangeTransaction: {
+        type: ReserveTransactionType.Credit,
+        amount: "TESTKUDOS:100",
+        sender_account_url: "payto://void/",
+        timestamp: { t_ms: 42 },
+        wire_reference: "ABC01",
+      },
+    },
+  ];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:50",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC02",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  t.deepEqual(r.updatedLocalHistory.length, 2);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:150");
+  t.deepEqual(Amounts.stringify(s.awaitedReserveAmount), "TESTKUDOS:0");
+  t.deepEqual(Amounts.stringify(s.unclaimedReserveAmount), "TESTKUDOS:150");
+});
+
+test("fulfilling credit", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [
+    {
+      type: WalletReserveHistoryItemType.Credit,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:100"),
+    },
+  ];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:50",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC02",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  t.deepEqual(r.updatedLocalHistory.length, 2);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:150");
+});
+
+test("unfulfilled credit", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [
+    {
+      type: WalletReserveHistoryItemType.Credit,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:100"),
+    },
+  ];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:50",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC02",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  t.deepEqual(r.updatedLocalHistory.length, 2);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:150");
+});
+
+test("awaited credit", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [
+    {
+      type: WalletReserveHistoryItemType.Credit,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:50"),
+    },
+    {
+      type: WalletReserveHistoryItemType.Credit,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:100"),
+    },
+  ];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  t.deepEqual(r.updatedLocalHistory.length, 2);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:100");
+  t.deepEqual(Amounts.stringify(s.awaitedReserveAmount), "TESTKUDOS:50");
+  t.deepEqual(Amounts.stringify(s.unclaimedReserveAmount), "TESTKUDOS:100");
+});
+
+test("withdrawal new match", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [
+    {
+      type: WalletReserveHistoryItemType.Credit,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:100"),
+      matchedExchangeTransaction: {
+        type: ReserveTransactionType.Credit,
+        amount: "TESTKUDOS:100",
+        sender_account_url: "payto://void/",
+        timestamp: { t_ms: 42 },
+        wire_reference: "ABC01",
+      },
+    },
+    {
+      type: WalletReserveHistoryItemType.Withdraw,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:5"),
+    },
+  ];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+    {
+      type: ReserveTransactionType.Withdraw,
+      amount: "TESTKUDOS:5",
+      h_coin_envelope: "foobar",
+      h_denom_pub: "foobar",
+      reserve_sig: "foobar",
+      withdraw_fee: "TESTKUDOS:0.1",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  console.log(r);
+  t.deepEqual(r.updatedLocalHistory.length, 2);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:95");
+  t.deepEqual(Amounts.stringify(s.awaitedReserveAmount), "TESTKUDOS:0");
+  t.deepEqual(Amounts.stringify(s.unclaimedReserveAmount), "TESTKUDOS:95");
+});
+
+test("claimed but now arrived", (t) => {
+  const localHistory: WalletReserveHistoryItem[] = [
+    {
+      type: WalletReserveHistoryItemType.Credit,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:100"),
+      matchedExchangeTransaction: {
+        type: ReserveTransactionType.Credit,
+        amount: "TESTKUDOS:100",
+        sender_account_url: "payto://void/",
+        timestamp: { t_ms: 42 },
+        wire_reference: "ABC01",
+      },
+    },
+    {
+      type: WalletReserveHistoryItemType.Withdraw,
+      expectedAmount: Amounts.parseOrThrow("TESTKUDOS:5"),
+    },
+  ];
+  const remoteHistory: ReserveTransaction[] = [
+    {
+      type: ReserveTransactionType.Credit,
+      amount: "TESTKUDOS:100",
+      sender_account_url: "payto://void/",
+      timestamp: { t_ms: 42 },
+      wire_reference: "ABC01",
+    },
+  ];
+  const r = reconcileReserveHistory(localHistory, remoteHistory);
+  const s = summarizeReserveHistory(r.updatedLocalHistory, "TESTKUDOS");
+  t.deepEqual(r.updatedLocalHistory.length, 2);
+  t.deepEqual(Amounts.stringify(s.computedReserveBalance), "TESTKUDOS:100");
+  t.deepEqual(Amounts.stringify(s.awaitedReserveAmount), "TESTKUDOS:0");
+  t.deepEqual(Amounts.stringify(s.unclaimedReserveAmount), "TESTKUDOS:95");
+});