blob: d904f46ad4201fa03d82d46b22889c50ca37221f [file] [log] [blame]
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
// @dart = 2.9
import "package:expect/expect.dart";
class FixedHashCode {
final int _hashCode;
const FixedHashCode(this._hashCode);
int get hashCode {
return _hashCode;
}
}
class SetIteratorTest {
static testMain() {
testSmallSet();
testLargeSet();
testEmptySet();
testSetWithDeletedEntries();
testBug5116829();
testDifferentSizes();
testDifferentHashCodes();
}
static int sum(int expected, Iterator<int> it) {
int count = 0;
while (it.moveNext()) {
count += it.current;
}
Expect.equals(expected, count);
}
static void testSmallSet() {
Set<int> set = new Set<int>();
set.add(1);
set.add(2);
set.add(3);
Iterator<int> it = set.iterator;
sum(6, it);
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
}
static void testLargeSet() {
Set<int> set = new Set<int>();
int count = 0;
for (int i = 0; i < 100; i++) {
count += i;
set.add(i);
}
Iterator<int> it = set.iterator;
sum(count, it);
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
}
static void testEmptySet() {
Set<int> set = new Set<int>();
Iterator<int> it = set.iterator;
sum(0, it);
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
}
static void testSetWithDeletedEntries() {
Set<int> set = new Set<int>();
for (int i = 0; i < 100; i++) {
set.add(i);
}
for (int i = 0; i < 100; i++) {
set.remove(i);
}
Iterator<int> it = set.iterator;
Expect.isFalse(it.moveNext());
it = set.iterator;
sum(0, it);
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
int count = 0;
for (int i = 0; i < 100; i++) {
set.add(i);
if (i % 2 == 0)
set.remove(i);
else
count += i;
}
it = set.iterator;
sum(count, it);
Expect.isFalse(it.moveNext());
Expect.isNull(it.current);
}
static void testBug5116829() {
// During iteration we skipped slot 0 of the hashset's key list. "A" was
// hashed to slot 0 and therefore triggered the bug.
Set<String> mystrs = new Set<String>();
mystrs.add("A");
int seen = 0;
for (String elt in mystrs) {
seen++;
Expect.equals("A", elt);
}
Expect.equals(1, seen);
}
static void testDifferentSizes() {
for (int i = 1; i < 20; i++) {
Set set = new Set();
int sum = 0;
for (int j = 0; j < i; j++) {
set.add(j);
sum += j;
}
int count = 0;
int controlSum = 0;
for (int x in set) {
controlSum += x;
count++;
}
Expect.equals(i, count);
Expect.equals(sum, controlSum);
}
}
static void testDifferentHashCodes() {
for (int i = -20; i < 20; i++) {
Set set = new Set();
var element = new FixedHashCode(i);
set.add(element);
Expect.equals(1, set.length);
bool foundIt = false;
for (var x in set) {
foundIt = true;
Expect.equals(true, identical(x, element));
}
Expect.equals(true, foundIt);
}
}
}
main() {
SetIteratorTest.testMain();
}