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// Copyright (c) 2013, 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.
// Tests of hash set behavior, with focus in iteration and concurrent
// modification errors.
library hash_map2_test;
import "package:expect/expect.dart";
import 'dart:collection';
testSet(Set newSet(), Set newSetFrom(Iterable from)) {
Set gen(int from, int to) =>
new Set.from(new Iterable.generate(to - from, (n) => n + from));
bool odd(int n) => (n & 1) == 1;
bool even(int n) => (n & 1) == 0;
{ // Test growing to largish capacity.
Set set = newSet();
for (int i = 0; i < 256; i++) {
set.add(i);
}
set.addAll(gen(256, 512));
set.addAll(newSetFrom(gen(512, 1000)));
Expect.equals(1000, set.length);
// Remove half.
for (int i = 0; i < 1000; i += 2) set.remove(i);
Expect.equals(500, set.length);
Expect.isFalse(set.any(even));
Expect.isTrue(set.every(odd));
// Re-add all.
set.addAll(gen(0, 1000));
Expect.equals(1000, set.length);
}
{ // Test having many deleted elements.
Set set = newSet();
set.add(0);
for (int i = 0; i < 1000; i++) {
set.add(i + 1);
set.remove(i);
Expect.equals(1, set.length);
}
}
{ // Test having many elements with same hashCode
Set set = newSet();
for (int i = 0; i < 1000; i++) {
set.add(new BadHashCode());
}
Expect.equals(1000, set.length);
}
{ // Check concurrent modification
Set set = newSet()..add(0)..add(1);
{ // Test adding before a moveNext.
Iterator iter = set.iterator;
iter.moveNext();
set.add(1); // Updating existing key isn't a modification.
iter.moveNext();
set.add(2);
Expect.throws(iter.moveNext, (e) => e is Error);
}
{ // Test adding after last element.
Iterator iter = set.iterator;
Expect.equals(3, set.length);
iter.moveNext();
iter.moveNext();
iter.moveNext();
set.add(3);
Expect.throws(iter.moveNext, (e) => e is Error);
}
{ // Test removing during iteration.
Iterator iter = set.iterator;
iter.moveNext();
set.remove(1000); // Not a modification if it's not there.
iter.moveNext();
int n = iter.current;
set.remove(n);
// Removing doesn't change current.
Expect.equals(n, iter.current);
Expect.throws(iter.moveNext, (e) => e is Error);
}
{ // Test removing after last element.
Iterator iter = set.iterator;
Expect.equals(3, set.length);
iter.moveNext();
iter.moveNext();
iter.moveNext();
int n = iter.current;
set.remove(n);
// Removing doesn't change current.
Expect.equals(n, iter.current);
Expect.throws(iter.moveNext, (e) => e is Error);
}
{ // Test that updating value doesn't cause error.
Iterator iter = set.iterator;
Expect.equals(2, set.length);
iter.moveNext();
int n = iter.current;
set.add(n);
iter.moveNext();
Expect.isTrue(set.contains(iter.current));
}
{ // Check adding many existing values isn't considered modification.
Set set2 = newSet();
for (var value in set) {
set2.add(value);
}
Iterator iter = set.iterator;
set.addAll(set2);
// Shouldn't throw.
iter.moveNext();
}
}
{ // Check that updating existing elements is not a modification.
// This must be the case even if the underlying data structure is
// nearly full.
for (int i = 1; i < 128; i++) {
// Create maps of different sizes, some of which should be
// at a limit of the underlying data structure.
Set set = newSetFrom(gen(0, i));
Iterator iter = set.iterator;
for (int j = 0; j < i; j++) {
set.add(j);
}
iter.moveNext(); // Should not throw.
for (int j = 1; j < i; j++) {
set.remove(j);
}
iter = set.iterator;
set.add(0);
iter.moveNext(); // Should not throw.
}
}
{ // Check that null can be in the set.
Set set = newSet();
set.add(null);
Expect.equals(1, set.length);
Expect.isTrue(set.contains(null));
Expect.isNull(set.first);
Expect.isNull(set.last);
set.add(null);
Expect.equals(1, set.length);
Expect.isTrue(set.contains(null));
set.remove(null);
Expect.isTrue(set.isEmpty);
Expect.isFalse(set.contains(null));
// Created using Set.from.
set = newSetFrom([null]);
Expect.equals(1, set.length);
Expect.isTrue(set.contains(null));
Expect.isNull(set.first);
Expect.isNull(set.last);
set.add(null);
Expect.equals(1, set.length);
Expect.isTrue(set.contains(null));
set.remove(null);
Expect.isTrue(set.isEmpty);
Expect.isFalse(set.contains(null));
// Set that grows with null in it.
set = newSetFrom([1, 2, 3, null, 4, 5, 6]);
Expect.equals(7, set.length);
for (int i = 7; i < 128; i++) {
set.add(i);
}
Expect.equals(128, set.length);
Expect.isTrue(set.contains(null));
set.add(null);
Expect.equals(128, set.length);
Expect.isTrue(set.contains(null));
set.remove(null);
Expect.equals(127, set.length);
Expect.isFalse(set.contains(null));
}
{ // Check that addAll and clear works.
Set set = newSet();
set.addAll([]);
Expect.isTrue(set.isEmpty);
set.addAll([1, 3, 2]);
Expect.equals(3, set.length);
Expect.isTrue(set.contains(1));
Expect.isTrue(set.contains(3));
Expect.isTrue(set.contains(2));
Expect.isFalse(set.contains(4));
set.clear();
Expect.isTrue(set.isEmpty);
}
{ // Check that removeWhere and retainWhere work.
Set set = newSetFrom([1, 2, 3]);
set.removeWhere((each) => each == 2);
Expect.equals(2, set.length);
Expect.isTrue(set.contains(1));
Expect.isFalse(set.contains(2));
Expect.isTrue(set.contains(3));
set.retainWhere((each) => each == 3);
Expect.equals(1, set.length);
Expect.isFalse(set.contains(1));
Expect.isFalse(set.contains(2));
Expect.isTrue(set.contains(3));
}
{ // Test lookup
Set set = newSet();
var m1a = new Mutable(1);
var m1b = new Mutable(1);
var m2a = new Mutable(2);
var m2b = new Mutable(2);
Expect.isNull(set.lookup(m1a));
Expect.isNull(set.lookup(m1b));
set.add(m1a);
Expect.identical(m1a, set.lookup(m1a));
Expect.identical(m1a, set.lookup(m1b));
Expect.isNull(set.lookup(m2a));
Expect.isNull(set.lookup(m2b));
set.add(m2a);
Expect.identical(m2a, set.lookup(m2a));
Expect.identical(m2a, set.lookup(m2b));
set.add(m2b); // Adding doesn't change element.
Expect.identical(m2a, set.lookup(m2a));
Expect.identical(m2a, set.lookup(m2b));
set.remove(m1a);
set.add(m1b);
Expect.identical(m1b, set.lookup(m1a));
Expect.identical(m1b, set.lookup(m1b));
set.add(1);
Expect.identical(1, set.lookup(1.0));
set.add(-0.0);
Expect.identical(-0.0, set.lookup(0.0));
}
}
void testIdentitySet(Set create()) {
Set set = create();
set.add(1);
set.add(2);
set.add(1); // Integers are identical if equal.
Expect.equals(2, set.length);
var complex = 4;
complex = set.length == 2 ? complex ~/ 4 : 87; // Avoid compile-time constant.
Expect.isTrue(set.contains(complex)); // 1 is in set, even if computed.
set.clear();
// All compile time constants are identical to themselves.
var constants = [double.INFINITY,
double.NAN, -0.0, /// 01: ok
0.0, 42, "", null, false, true, #bif, testIdentitySet];
set.addAll(constants);
Expect.equals(constants.length, set.length);
for (var c in constants) {
Expect.isTrue(set.contains(c), "constant: $c");
}
Expect.isTrue(set.containsAll(constants), "constants: $set");
set.clear();
var m1 = new Mutable(1);
var m2 = new Mutable(2);
var m3 = new Mutable(3);
var m4 = new Mutable(2); // Equal to m2, but not identical.
set.addAll([m1, m2, m3, m4]);
Expect.equals(4, set.length);
Expect.equals(3, m3.hashCode);
m3.id = 1;
Expect.equals(1, m3.hashCode);
// Changing hashCode doesn't affect lookup.
Expect.isTrue(set.contains(m3));
Expect.isTrue(set.contains(m1));
set.remove(m3);
Expect.isFalse(set.contains(m3));
Expect.isTrue(set.contains(m1));
Expect.identical(m1, set.lookup(m1));
Expect.identical(null, set.lookup(m3));
}
void main() {
testSet(() => new Set(), (m) => new Set.from(m));
testSet(() => new HashSet(), (m) => new HashSet.from(m));
testSet(() => new LinkedHashSet(), (m) => new LinkedHashSet.from(m));
testIdentitySet(() => new Set.identity());
testIdentitySet(() => new HashSet.identity());
testIdentitySet(() => new LinkedHashSet.identity());
testIdentitySet(() => new HashSet(equals: (x, y) => identical(x, y),
hashCode: (x) => identityHashCode(x)));
testIdentitySet(
() => new LinkedHashSet(equals: (x, y) => identical(x, y),
hashCode: (x) => identityHashCode(x)));
}
class BadHashCode {
static int idCounter = 0;
final int id;
BadHashCode() : id = idCounter++;
int get hashCode => 42;
// operator == is identity.
// Can't make a bad compareTo that isn't invalid.
int compareTo(BadHashCode other) => id - other.id;
}
class Mutable {
int id;
Mutable(this.id);
int get hashCode => id;
bool operator==(other) => other is Mutable && id == other.id;
}