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diff --git a/src/memidb/aatree-test.ts b/src/memidb/aatree-test.ts
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+/*
+ This file is part of TALER
+ (C) 2017 Inria and GNUnet e.V.
+
+ 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.
+
+ 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
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+
+
+import {test} from "ava";
+
+import * as aat from "./aatree";
+
+
+function shuffleArray(array: any[]): any[] {
+ for (let i = array.length - 1; i > 0; i--) {
+ const j = Math.floor(Math.random() * (i + 1));
+ const temp = array[i];
+ array[i] = array[j];
+ array[j] = temp;
+ }
+ return array;
+}
+
+
+function myCmp(a: any, b: any): number {
+ if (a < b) {
+ return -1;
+ }
+ if (a > b) {
+ return 1;
+ }
+ return 0;
+}
+
+
+test("insertion", (t) => {
+ let vs = [];
+ for (let i = 0; i < 1000; i++) {
+ vs.push(Math.floor(Math.random() * 500));
+ }
+
+ let tree = undefined;
+ t.true(aat.checkInvariants(tree));
+
+ for (let i = 0; i < 1000; i++) {
+ tree = aat.treeInsert(tree, vs[i], myCmp);
+ t.true(aat.checkInvariants(tree));
+ t.true(aat.treeFind(tree, vs[i], myCmp));
+ }
+
+ vs = Array.from(new Set(vs));
+
+ vs.sort((a, b) => a - b);
+ t.deepEqual(aat.treeToArray(tree), vs);
+});
+
+
+test("deletion", (t) => {
+ let vs = [];
+ let tree = undefined;
+ for (let i = 0; i < 1000; i++) {
+ vs.push(Math.floor(Math.random() * 500));
+ tree = aat.treeInsert(tree, vs[i], myCmp);
+ t.true(aat.checkInvariants(tree));
+ t.true(aat.treeFind(tree, vs[i], myCmp));
+ }
+
+ shuffleArray(vs);
+
+ for (let i = 0; i < 1000; i++) {
+ tree = aat.treeDelete(tree, vs[i], myCmp);
+ t.true(aat.checkInvariants(tree));
+ t.false(aat.treeFind(tree, vs[i], myCmp));
+ }
+});