qt5base-lts/tests/auto/qhash/tst_qhash.cpp

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#include <QtTest/QtTest>

#include <qhash.h>
#include <qmap.h>

//TESTED_CLASS=
//TESTED_FILES=

class tst_QHash : public QObject
{
    Q_OBJECT

public:
    tst_QHash();
    virtual ~tst_QHash() {}

private slots:
    void insert1();
    void erase();
    void key();

    void swap();
    void count(); // copied from tst_QMap
    void clear(); // copied from tst_QMap
    void empty(); // copied from tst_QMap
    void find(); // copied from tst_QMap
    void constFind(); // copied from tst_QMap
    void contains(); // copied from tst_QMap
    void take(); // copied from tst_QMap
    void operator_eq(); // copied from tst_QMap
    void rehash_isnt_quadratic();
    void dont_need_default_constructor();
    void qhash();
    void qmultihash_specific();

    void compare();
    void compare2();
    void iterators(); // sligthly modified from tst_QMap
    void keys_values_uniqueKeys(); // slightly modified from tst_QMap
    void noNeedlessRehashes();
};

struct Foo {
    static int count;
    Foo():c(count) { ++count; }
    Foo(const Foo& o):c(o.c) { ++count; }
    ~Foo() { --count; }
    int c;
    int data[8];
};

tst_QHash::tst_QHash()
{}

int Foo::count = 0;

//copied from tst_QMap.cpp
class MyClass
{
public:
    MyClass() { ++count;
//     qDebug("creating MyClass count=%d", count);
    }
    MyClass( const QString& c) {
	count++; str = c;
// 	qDebug("creating MyClass '%s' count = %d", str.latin1(), count);
    }
    ~MyClass() {
	count--;
// 	qDebug("deleting MyClass '%s' count = %d", str.latin1(), count);
    }
    MyClass( const MyClass& c ) {
	count++; str = c.str;
// 	qDebug("creating MyClass '%s' count = %d", str.latin1(), count);
    }
    MyClass &operator =(const MyClass &o) {
// 	qDebug("copying MyClass '%s'", o.str.latin1());
	str = o.str; return *this;
    }

    QString str;
    static int count;
};

int MyClass::count = 0;

typedef QHash<QString, MyClass> MyMap;

//void tst_QMap::count()
void tst_QHash::count()
{
    {
	MyMap map;
	MyMap map2( map );
	QCOMPARE( map.count(), 0 );
	QCOMPARE( map2.count(), 0 );
	QCOMPARE( MyClass::count, 0 );
	// detach
	map2["Hallo"] = MyClass( "Fritz" );
	QCOMPARE( map.count(), 0 );
        QCOMPARE( map2.count(), 1 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 1 );
#endif
    }
    QCOMPARE( MyClass::count, 0 );

    {
	typedef QHash<QString, MyClass> Map;
	Map map;
	QCOMPARE( map.count(), 0);
	map.insert( "Torben", MyClass("Weis") );
	QCOMPARE( map.count(), 1 );
	map.insert( "Claudia", MyClass("Sorg") );
	QCOMPARE( map.count(), 2 );
	map.insert( "Lars", MyClass("Linzbach") );
	map.insert( "Matthias", MyClass("Ettrich") );
	map.insert( "Sue", MyClass("Paludo") );
	map.insert( "Eirik", MyClass("Eng") );
	map.insert( "Haavard", MyClass("Nord") );
	map.insert( "Arnt", MyClass("Gulbrandsen") );
	map.insert( "Paul", MyClass("Tvete") );
	QCOMPARE( map.count(), 9 );
	map.insert( "Paul", MyClass("Tvete 1") );
	map.insert( "Paul", MyClass("Tvete 2") );
	map.insert( "Paul", MyClass("Tvete 3") );
	map.insert( "Paul", MyClass("Tvete 4") );
	map.insert( "Paul", MyClass("Tvete 5") );
	map.insert( "Paul", MyClass("Tvete 6") );

	QCOMPARE( map.count(), 9 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 9 );
#endif

	Map map2( map );
	QVERIFY( map2.count() == 9 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 9 );
#endif

	map2.insert( "Kay", MyClass("Roemer") );
	QVERIFY( map2.count() == 10 );
	QVERIFY( map.count() == 9 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 19 );
#endif

	map2 = map;
	QVERIFY( map.count() == 9 );
	QVERIFY( map2.count() == 9 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 9 );
#endif

	map2.insert( "Kay", MyClass("Roemer") );
	QVERIFY( map2.count() == 10 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 19 );
#endif

	map2.clear();
	QVERIFY( map.count() == 9 );
	QVERIFY( map2.count() == 0 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 9 );
#endif

	map2 = map;
	QVERIFY( map.count() == 9 );
	QVERIFY( map2.count() == 9 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 9 );
#endif

	map2.clear();
	QVERIFY( map.count() == 9 );
	QVERIFY( map2.count() == 0 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 9 );
#endif

	map.remove( "Lars" );
	QVERIFY( map.count() == 8 );
	QVERIFY( map2.count() == 0 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 8 );
#endif

	map.remove( "Mist" );
	QVERIFY( map.count() == 8 );
	QVERIFY( map2.count() == 0 );
#ifndef Q_CC_SUN
	QCOMPARE( MyClass::count, 8 );
#endif
    }
    QVERIFY( MyClass::count == 0 );

    {
	typedef QHash<QString,MyClass> Map;
	Map map;
	map["Torben"] = MyClass("Weis");
#ifndef Q_CC_SUN
	QVERIFY( MyClass::count == 1 );
#endif
	QVERIFY( map.count() == 1 );

	(void)map["Torben"].str;
	(void)map["Lars"].str;
#ifndef Q_CC_SUN
	QVERIFY( MyClass::count == 2 );
#endif
	QVERIFY( map.count() == 2 );

	const Map& cmap = map;
	(void)cmap["Depp"].str;
#ifndef Q_CC_SUN
	QVERIFY( MyClass::count == 2 );
#endif
	QVERIFY( map.count() == 2 );
	QVERIFY( cmap.count() == 2 );
    }
    QCOMPARE( MyClass::count, 0 );
    {
	for ( int i = 0; i < 100; ++i )
	{
	    QHash<int, MyClass> map;
	    for (int j = 0; j < i; ++j)
		map.insert(j, MyClass(QString::number(j)));
	}
	QCOMPARE( MyClass::count, 0 );
    }
    QCOMPARE( MyClass::count, 0 );
}
void tst_QHash::insert1()
{
    const char *hello = "hello";
    const char *world = "world";
    const char *allo = "allo";
    const char *monde = "monde";

    {
        typedef QHash<QString, QString> Hash;
        Hash hash;
        QString key;
        for (int i = 0; i < 10; ++i) {
            key[0] = i + '0';
            for (int j = 0; j < 10; ++j) {
                key[1] = j + '0';
                hash.insert(key, "V" + key);
            }
        }

        for (int i = 0; i < 10; ++i) {
            key[0] = i + '0';
            for (int j = 0; j < 10; ++j) {
                key[1] = j + '0';
                hash.remove(key);
            }
        }
    }

    {
        typedef QHash<int, const char *> Hash;
        Hash hash;
        hash.insert(1, hello);
        hash.insert(2, world);

        QVERIFY(hash.size() == 2);
        QVERIFY(!hash.isEmpty());

        {
            Hash hash2 = hash;
            hash2 = hash;
            hash = hash2;
            hash2 = hash2;
            hash = hash;
            hash2.clear();
            hash2 = hash2;
            QVERIFY(hash2.size() == 0);
            QVERIFY(hash2.isEmpty());
        }
        QVERIFY(hash.size() == 2);

        {
            Hash hash2 = hash;
            hash2[1] = allo;
            hash2[2] = monde;

            QVERIFY(hash2[1] == allo);
            QVERIFY(hash2[2] == monde);
            QVERIFY(hash[1] == hello);
            QVERIFY(hash[2] == world);

            hash2[1] = hash[1];
            hash2[2] = hash[2];

            QVERIFY(hash2[1] == hello);
            QVERIFY(hash2[2] == world);

            hash[1] = hash[1];
	    QVERIFY(hash[1] == hello);
	}
	        {
            Hash hash2 = hash;
            hash2.detach();
            hash2.remove(1);
            QVERIFY(hash2.size() == 1);
            hash2.remove(1);
            QVERIFY(hash2.size() == 1);
            hash2.remove(0);
            QVERIFY(hash2.size() == 1);
            hash2.remove(2);
            QVERIFY(hash2.size() == 0);
            QVERIFY(hash.size() == 2);
        }

        hash.detach();

        {
            Hash::iterator it1 = hash.find(1);
            QVERIFY(it1 != hash.end());

            Hash::iterator it2 = hash.find(0);
            QVERIFY(it2 != hash.begin());
            QVERIFY(it2 == hash.end());

            *it1 = monde;
            QVERIFY(*it1 == monde);
            QVERIFY(hash[1] == monde);

            *it1 = hello;
            QVERIFY(*it1 == hello);
            QVERIFY(hash[1] == hello);

            hash[1] = monde;
            QVERIFY(it1.key() == 1);
            QVERIFY(it1.value() == monde);
            QVERIFY(*it1 == monde);
            QVERIFY(hash[1] == monde);

            hash[1] = hello;
            QVERIFY(*it1 == hello);
            QVERIFY(hash[1] == hello);
        }

        {
            const Hash hash2 = hash;

            Hash::const_iterator it1 = hash2.find(1);
            QVERIFY(it1 != hash2.end());
            QVERIFY(it1.key() == 1);
            QVERIFY(it1.value() == hello);
            QVERIFY(*it1 == hello);

            Hash::const_iterator it2 = hash2.find(2);
            QVERIFY(it1 != it2);
            QVERIFY(it1 != hash2.end());
            QVERIFY(it2 != hash2.end());

            int count = 0;
            it1 = hash2.begin();
            while (it1 != hash2.end()) {
                count++;
                ++it1;
            }
            QVERIFY(count == 2);

            count = 0;
            it1 = hash.begin();
            while (it1 != hash.end()) {
                count++;
                ++it1;
            }
            QVERIFY(count == 2);
        }

        {
            QVERIFY(hash.contains(1));
            QVERIFY(hash.contains(2));
            QVERIFY(!hash.contains(0));
            QVERIFY(!hash.contains(3));
        }

        {
            QVERIFY(hash.value(1) == hello);
            QVERIFY(hash.value(2) == world);
            QVERIFY(hash.value(3) == 0);
            QVERIFY(hash.value(1, allo) == hello);
            QVERIFY(hash.value(2, allo) == world);
            QVERIFY(hash.value(3, allo) == allo);
            QVERIFY(hash.value(0, monde) == monde);
        }

        {
            QHash<int,Foo> hash;
            for (int i = 0; i < 10; i++)
                hash.insert(i, Foo());
            QVERIFY(Foo::count == 10);
            hash.remove(7);
            QVERIFY(Foo::count == 9);

        }
        QVERIFY(Foo::count == 0);
        {
            QHash<int, int*> hash;
            QVERIFY(((const QHash<int,int*>*) &hash)->operator[](7) == 0);
        }
    }
}

void tst_QHash::erase()
{
    QHash<int, int> h1;
    h1.insert(1, 2);
    h1.erase(h1.begin());
    QVERIFY(h1.size() == 0);
    QVERIFY(h1.begin() == h1.end());
    h1.insert(3, 4);
    QVERIFY(*h1.begin() == 4);
    h1.insert(5, 6);
    QVERIFY(h1.size() == 2);
    QHash<int, int>::iterator it1 = h1.begin();
    ++it1;
    it1 = h1.erase(it1);
    QVERIFY(it1 == h1.end());
    h1.insert(7, 8);
    h1.insert(9, 10);
    it1 = h1.begin();
    int n = 0;
    while (it1 != h1.end()) {
	it1 = h1.erase(it1);
	++n;
    }
    QVERIFY(n == 3);
    QHash<int, int> h2;
    h2.insertMulti(20, 41);
    h2.insertMulti(20, 42);
    QVERIFY(h2.size() == 2);
    it1 = h2.erase(h2.begin());
    it1 = h2.erase(h2.begin());
    QVERIFY(it1 == h2.end());
}

void tst_QHash::key()
{
    {
        QString def("default value");

        QHash<QString, int> hash1;
        QCOMPARE(hash1.key(1), QString());
        QCOMPARE(hash1.key(1, def), def);

        hash1.insert("one", 1);
        QCOMPARE(hash1.key(1), QString("one"));
        QCOMPARE(hash1.key(1, def), QString("one"));
        QCOMPARE(hash1.key(2), QString());
        QCOMPARE(hash1.key(2, def), def);

        hash1.insert("two", 2);
        QCOMPARE(hash1.key(1), QString("one"));
        QCOMPARE(hash1.key(1, def), QString("one"));
        QCOMPARE(hash1.key(2), QString("two"));
        QCOMPARE(hash1.key(2, def), QString("two"));
        QCOMPARE(hash1.key(3), QString());
        QCOMPARE(hash1.key(3, def), def);

        hash1.insert("deux", 2);
        QCOMPARE(hash1.key(1), QString("one"));
        QCOMPARE(hash1.key(1, def), QString("one"));
        QVERIFY(hash1.key(2) == "deux" || hash1.key(2) == "two");
        QVERIFY(hash1.key(2, def) == "deux" || hash1.key(2, def) == "two");
        QCOMPARE(hash1.key(3), QString());
        QCOMPARE(hash1.key(3, def), def);
    }

    {
        int def = 666;

        QHash<int, QString> hash2;
        QCOMPARE(hash2.key("one"), 0);
        QCOMPARE(hash2.key("one", def), def);

        hash2.insert(1, "one");
        QCOMPARE(hash2.key("one"), 1);
        QCOMPARE(hash2.key("one", def), 1);
        QCOMPARE(hash2.key("two"), 0);
        QCOMPARE(hash2.key("two", def), def);

        hash2.insert(2, "two");
        QCOMPARE(hash2.key("one"), 1);
        QCOMPARE(hash2.key("one", def), 1);
        QCOMPARE(hash2.key("two"), 2);
        QCOMPARE(hash2.key("two", def), 2);
        QCOMPARE(hash2.key("three"), 0);
        QCOMPARE(hash2.key("three", def), def);

        hash2.insert(3, "two");
        QCOMPARE(hash2.key("one"), 1);
        QCOMPARE(hash2.key("one", def), 1);
        QCOMPARE(hash2.key("two"), 2);
        QCOMPARE(hash2.key("two", def), 2);
        QCOMPARE(hash2.key("three"), 0);
        QCOMPARE(hash2.key("three", def), def);

        hash2.insert(-1, "two");
        QCOMPARE(hash2.key("two"), -1);
        QCOMPARE(hash2.key("two", def), -1);

        hash2.insert(0, "zero");
        QCOMPARE(hash2.key("zero"), 0);
        QCOMPARE(hash2.key("zero", def), 0);
    }
}

void tst_QHash::swap()
{
    QHash<int,QString> h1, h2;
    h1[0] = "h1[0]";
    h2[1] = "h2[1]";
    h1.swap(h2);
    QCOMPARE(h1.value(1),QLatin1String("h2[1]"));
    QCOMPARE(h2.value(0),QLatin1String("h1[0]"));
}

// copied from tst_QMap
void tst_QHash::clear()
{
    {
	MyMap map;
	map.clear();
	QVERIFY( map.isEmpty() );
	map.insert( "key", MyClass( "value" ) );
	map.clear();
	QVERIFY( map.isEmpty() );
	map.insert( "key0", MyClass( "value0" ) );
	map.insert( "key0", MyClass( "value1" ) );
	map.insert( "key1", MyClass( "value2" ) );
	map.clear();
	QVERIFY( map.isEmpty() );
    }
    QCOMPARE( MyClass::count, int(0) );
}
//copied from tst_QMap
void tst_QHash::empty()
{
    QHash<int, QString> map1;

    QVERIFY(map1.isEmpty());

    map1.insert(1, "one");
    QVERIFY(!map1.isEmpty());

    map1.clear();
    QVERIFY(map1.isEmpty());

}

//copied from tst_QMap
void tst_QHash::find()
{
    QHash<int, QString> map1;
    QString testString="Teststring %0";
    QString compareString;
    int i,count=0;

    //QVERIFY(map1.find(1) == map1.end());

    map1.insert(1,"Mensch");
    map1.insert(1,"Mayer");
    map1.insert(2,"Hej");

    QVERIFY(map1.find(1).value() == "Mayer");
    QVERIFY(map1.find(2).value() == "Hej");

    for(i = 3; i < 10; ++i) {
        compareString = testString.arg(i);
        map1.insertMulti(4, compareString);
    }

    QHash<int, QString>::const_iterator it=map1.find(4);

    for(i = 9; i > 2 && it != map1.end() && it.key() == 4; --i) {
        compareString = testString.arg(i);
        QVERIFY(it.value() == compareString);
        ++it;
        ++count;
    }
    QCOMPARE(count, 7);
}

// copied from tst_QMap
void tst_QHash::constFind()
{
    QHash<int, QString> map1;
    QString testString="Teststring %0";
    QString compareString;
    int i,count=0;

    QVERIFY(map1.constFind(1) == map1.constEnd());

    map1.insert(1,"Mensch");
    map1.insert(1,"Mayer");
    map1.insert(2,"Hej");

    QVERIFY(map1.constFind(1).value() == "Mayer");
    QVERIFY(map1.constFind(2).value() == "Hej");

    for(i = 3; i < 10; ++i) {
        compareString = testString.arg(i);
        map1.insertMulti(4, compareString);
    }

    QHash<int, QString>::const_iterator it=map1.constFind(4);

    for(i = 9; i > 2 && it != map1.constEnd() && it.key() == 4; --i) {
        compareString = testString.arg(i);
        QVERIFY(it.value() == compareString);
        ++it;
        ++count;
    }
    QCOMPARE(count, 7);
}

// copied from tst_QMap
void tst_QHash::contains()
{
    QHash<int, QString> map1;
    int i;

    map1.insert(1, "one");
    QVERIFY(map1.contains(1));

    for(i=2; i < 100; ++i)
        map1.insert(i, "teststring");
    for(i=99; i > 1; --i)
        QVERIFY(map1.contains(i));

    map1.remove(43);
    QVERIFY(!map1.contains(43));
}

//copied from tst_QMap
void tst_QHash::take()
{
    QHash<int, QString> map;

    map.insert(2, "zwei");
    map.insert(3, "drei");

    QVERIFY(map.take(3) == "drei");
    QVERIFY(!map.contains(3));
}

//copied from tst_QMap
void tst_QHash::operator_eq()
{
    {
        // compare for equality:
        QHash<int, int> a;
        QHash<int, int> b;

        QVERIFY(a == b);
        QVERIFY(!(a != b));

        a.insert(1,1);
        b.insert(1,1);
        QVERIFY(a == b);
        QVERIFY(!(a != b));

        a.insert(0,1);
        b.insert(0,1);
        QVERIFY(a == b);
        QVERIFY(!(a != b));

        // compare for inequality:
        a.insert(42,0);
        QVERIFY(a != b);
        QVERIFY(!(a == b));

        a.insert(65, -1);
        QVERIFY(a != b);
        QVERIFY(!(a == b));

        b.insert(-1, -1);
        QVERIFY(a != b);
        QVERIFY(!(a == b));
    }

    {
        // a more complex map
        QHash<QString, QString> a;
        QHash<QString, QString> b;

        QVERIFY(a == b);
        QVERIFY(!(a != b));

        a.insert("Hello", "World");
        QVERIFY(a != b);
        QVERIFY(!(a == b));

        b.insert("Hello", "World");
        QVERIFY(a == b);
        QVERIFY(!(a != b));

        a.insert("Goodbye", "cruel world");
        QVERIFY(a != b);
        QVERIFY(!(a == b));

        b.insert("Goodbye", "cruel world");

        // what happens if we insert nulls?
        a.insert(QString(), QString());
        QVERIFY(a != b);
        QVERIFY(!(a == b));

        // empty keys and null keys match:
        b.insert(QString(""), QString());
        QVERIFY(a == b);
        QVERIFY(!(a != b));
    }

    {
        // task 102658

        QHash<QString, int> a;
        QHash<QString, int> b;

        a.insert("otto", 1);
        b.insert("willy", 1);
        QVERIFY(a != b);
        QVERIFY(!(a == b));
    }
}

void tst_QHash::compare()
{
    QHash<int, QString> hash1,hash2;
    QString testString = "Teststring %1";
    int i;

    for(i = 0; i < 1000; ++i)
        hash1.insert(i,testString.arg(i));

    for(--i; i >= 0; --i)
        hash2.insert(i,testString.arg(i));

    hash1.squeeze();
    hash2.squeeze();

    QVERIFY(hash1 == hash2);
    QVERIFY(!(hash1 != hash2));

    hash1.take(234);
    hash2.take(234);
    QVERIFY(hash1 == hash2);
    QVERIFY(!(hash1 != hash2));

    hash2.take(261);
    QVERIFY(!(hash1 == hash2));
    QVERIFY(hash1 != hash2);
}

void tst_QHash::compare2()
{
    QHash<int, int> a;
    QHash<int, int> b;

    a.insertMulti(17, 1);
    a.insertMulti(17 * 2, 1);
    b.insertMulti(17 * 2, 1);
    b.insertMulti(17, 1);
    QVERIFY(a == b);
    QVERIFY(b == a);

    a.insertMulti(17, 2);
    a.insertMulti(17 * 2, 3);
    b.insertMulti(17 * 2, 3);
    b.insertMulti(17, 2);
    QVERIFY(a == b);
    QVERIFY(b == a);

    a.insertMulti(17, 4);
    a.insertMulti(17 * 2, 5);
    b.insertMulti(17 * 2, 4);
    b.insertMulti(17, 5);
    QVERIFY(!(a == b));
    QVERIFY(!(b == a));

    a.clear();
    b.clear();
    a.insertMulti(1, 1);
    a.insertMulti(1, 2);
    a.insertMulti(1, 3);
    b.insertMulti(1, 1);
    b.insertMulti(1, 2);
    b.insertMulti(1, 3);
    b.insertMulti(1, 4);
    QVERIFY(!(a == b));
    QVERIFY(!(b == a));
}

//sligthly modified from tst_QMap
void tst_QHash::iterators()
{
    QHash<int, QString> hash;
    QMap<int, QString> testMap;
    QString testString="Teststring %1";
    QString testString1;
    int i;

    for(i = 1; i < 100; ++i)
        hash.insert(i, testString.arg(i));

    //to get some chaos in the hash
    hash.squeeze();

    //STL-Style iterators

    QHash<int, QString>::iterator stlIt = hash.begin();
    for(stlIt = hash.begin(), i = 1; stlIt != hash.end(), i < 100; ++stlIt, ++i) {
            testMap.insert(i,stlIt.value());
            //QVERIFY(stlIt.value() == hash.value(
    }
    stlIt = hash.begin();

    QVERIFY(stlIt.value() == testMap.value(1));

    stlIt+=5;
    QVERIFY(stlIt.value() == testMap.value(6));

    stlIt++;
    QVERIFY(stlIt.value() == testMap.value(7));

    stlIt-=3;
    QVERIFY(stlIt.value() == testMap.value(4));

    stlIt--;
    QVERIFY(stlIt.value() == testMap.value(3));

    testMap.clear();

    //STL-Style const-iterators

    QHash<int, QString>::const_iterator cstlIt = hash.constBegin();
    for(cstlIt = hash.constBegin(), i = 1; cstlIt != hash.constEnd(), i < 100; ++cstlIt, ++i) {
            testMap.insert(i,cstlIt.value());
            //QVERIFY(stlIt.value() == hash.value(
    }
    cstlIt = hash.constBegin();

    QVERIFY(cstlIt.value() == testMap.value(1));

    cstlIt+=5;
    QVERIFY(cstlIt.value() == testMap.value(6));

    cstlIt++;
    QVERIFY(cstlIt.value() == testMap.value(7));

    cstlIt-=3;
    QVERIFY(cstlIt.value() == testMap.value(4));

    cstlIt--;
    QVERIFY(cstlIt.value() == testMap.value(3));

    testMap.clear();

    //Java-Style iterators

    QHashIterator<int, QString> javaIt(hash);

    //walk through
    i = 0;
    while(javaIt.hasNext()) {
        ++i;
        javaIt.next();
        testMap.insert(i,javaIt.value());
    }
    javaIt.toFront();
    i = 0;
    while(javaIt.hasNext()) {
        ++i;
        javaIt.next();
        //qDebug(javaIt.value());
        QVERIFY(javaIt.value() == testMap.value(i));
    }

    ++i;
    while(javaIt.hasPrevious()) {
        --i;
        javaIt.previous();
        QVERIFY(javaIt.value() == testMap.value(i));
    }

    /*
        I've removed findNextKey() and findPreviousKey() from the API
        for Qt 4.0 beta 1.
    */

#if 0
    //findPreviousKey()  findNextKey()
    for(i = 1; i < 100; ++i) {
        if(javaIt.findNextKey(i))
            QVERIFY(javaIt.value() == testString.arg(i));
        else {
            QVERIFY(!javaIt.hasNext());
            QVERIFY(javaIt.findPreviousKey(i));
            QVERIFY(javaIt.value() == testString.arg(i));
        }

        if(javaIt.findPreviousKey(i))
            QVERIFY(javaIt.value() == testString.arg(i));
        else {
            QVERIFY(!javaIt.hasPrevious());
            QVERIFY(javaIt.findNextKey(i));
            QVERIFY(javaIt.value() == testString.arg(i));
        }
    }
#endif

    //peekNext()  peekPrevious()
    javaIt.toFront();
    javaIt.next();
    while(javaIt.hasNext()) {
        testString = javaIt.value();
        testString1 = javaIt.peekNext().value();
        javaIt.next();
        //qDebug(testString + "  " + testString1 + "    " + javaIt.peekPrevious().value());
        QVERIFY(javaIt.value() == testString1);
        QCOMPARE(javaIt.peekPrevious().value(), testString1);
    }
    while(javaIt.hasPrevious()) {
        testString = javaIt.value();
        testString1 = javaIt.peekPrevious().value();
        javaIt.previous();
        QVERIFY(javaIt.value() == testString1);
        //qDebug(testString + testString1 + javaIt.peekNext().value());
        QCOMPARE(javaIt.peekNext().value(), testString1);
    }
}

void tst_QHash::rehash_isnt_quadratic()
{
    // this test should be incredibly slow if rehash() is quadratic
    for (int j = 0; j < 5; ++j) {
        QHash<int, int> testHash;
#if defined(Q_OS_WINCE) || defined(Q_OS_SYMBIAN) // mobiles do not have infinite mem...
        for (int i = 0; i < 50000; ++i)
#else
        for (int i = 0; i < 500000; ++i)
#endif
            testHash.insertMulti(1, 1);
    }
}

class Bar
{
public:
    Bar(int i) : j(i) {}

    int j;
};

void tst_QHash::dont_need_default_constructor()
{
    QHash<int, Bar> hash1;
    for (int i = 0; i < 100; ++i) {
        hash1.insert(i, Bar(2 * i));
        QVERIFY(hash1.value(i, Bar(-1)).j == 2 * i);
        QVERIFY(hash1.size() == i + 1);
    }

    QHash<QString, Bar> hash2;
    for (int i = 0; i < 100; ++i) {
        hash2.insert(QString::number(i), Bar(2 * i));
        QVERIFY(hash2.value(QString::number(i), Bar(-1)).j == 2 * i);
        QVERIFY(hash2.size() == i + 1);
    }
}

void tst_QHash::qhash()
{
    {
        QBitArray a1;
        QBitArray a2;
        QVERIFY(qHash(a1) == 0);

        a1.resize(1);
        a1.setBit(0, true);

        a2.resize(1);
        a2.setBit(0, false);

        uint h1 = qHash(a1);
        uint h2 = qHash(a2);

        QVERIFY(h1 != h2);

        a2.setBit(0, true);
        QVERIFY(h1 == qHash(a2));

        a1.fill(true, 8);
        a1.resize(7);

        h1 = qHash(a1);

        a2.fill(true, 7);
        h2 = qHash(a2);

        QVERIFY(h1 == h2);

        a2.setBit(0, false);
        uint h3 = qHash(a2);
        QVERIFY(h2 != h3);

        a2.setBit(0, true);
        QVERIFY(h2 == qHash(a2));

        a2.setBit(6, false);
        uint h4 = qHash(a2);
        QVERIFY(h2 != h4);

        a2.setBit(6, true);
        QVERIFY(h2 == qHash(a2));

        QVERIFY(h3 != h4);
    }

    {
        QPair<int, int> p12(1, 2);
        QPair<int, int> p21(2, 1);

        QVERIFY(qHash(p12) == qHash(p12));
        QVERIFY(qHash(p21) == qHash(p21));
        QVERIFY(qHash(p12) != qHash(p21));

        QPair<int, int> pA(0x12345678, 0x12345678);
        QPair<int, int> pB(0x12345675, 0x12345675);

        QVERIFY(qHash(pA) != qHash(pB));
    }
}

void tst_QHash::qmultihash_specific()
{
    QMultiHash<int, int> hash1;
    for (int i = 1; i <= 9; ++i) {
        for (int j = 1; j <= i; ++j) {
            int k = i * 10 + j;
            QVERIFY(!hash1.contains(i, k));
            hash1.insert(i, k);
            QVERIFY(hash1.contains(i, k));
        }
    }

    for (int i = 1; i <= 9; ++i) {
        for (int j = 1; j <= i; ++j) {
            int k = i * 10 + j;
            QVERIFY(hash1.contains(i, k));
        }
    }

    QVERIFY(hash1.contains(9, 99));
    QCOMPARE(hash1.count(), 45);
    hash1.remove(9, 99);
    QVERIFY(!hash1.contains(9, 99));
    QCOMPARE(hash1.count(), 44);

    hash1.remove(9, 99);
    QVERIFY(!hash1.contains(9, 99));
    QCOMPARE(hash1.count(), 44);

    hash1.remove(1, 99);
    QCOMPARE(hash1.count(), 44);

    hash1.insert(1, 99);
    hash1.insert(1, 99);

    QCOMPARE(hash1.count(), 46);
    hash1.remove(1, 99);
    QCOMPARE(hash1.count(), 44);
    hash1.remove(1, 99);
    QCOMPARE(hash1.count(), 44);

    {
    QMultiHash<int, int>::const_iterator i = hash1.constFind(1, 11);
    QVERIFY(i.key() == 1);
    QVERIFY(i.value() == 11);

    i = hash1.constFind(2, 22);
    QVERIFY(i.key() == 2);
    QVERIFY(i.value() == 22);

    i = hash1.constFind(9, 98);
    QVERIFY(i.key() == 9);
    QVERIFY(i.value() == 98);
    }

    {
    const QMultiHash<int, int> hash2(hash1);
    QMultiHash<int, int>::const_iterator i = hash2.find(1, 11);
    QVERIFY(i.key() == 1);
    QVERIFY(i.value() == 11);

    i = hash2.find(2, 22);
    QVERIFY(i.key() == 2);
    QVERIFY(i.value() == 22);

    i = hash2.find(9, 98);
    QVERIFY(i.key() == 9);
    QVERIFY(i.value() == 98);
    }

    {
    QMultiHash<int, int>::iterator i = hash1.find(1, 11);
    QVERIFY(i.key() == 1);
    QVERIFY(i.value() == 11);

    i = hash1.find(2, 22);
    QVERIFY(i.key() == 2);
    QVERIFY(i.value() == 22);

    i = hash1.find(9, 98);
    QVERIFY(i.key() == 9);
    QVERIFY(i.value() == 98);
    }

    {
    QMultiHash<int, int> map1;
    map1.insert(42, 1);
    map1.insert(10, 2);
    map1.insert(48, 3);
    QMultiHash<int, int> map2;
    map2.insert(8, 4);
    map2.insert(42, 5);
    map2.insert(95, 12);

    map1+=map2;
    map2.insert(42, 1);
    map2.insert(10, 2);
    map2.insert(48, 3);
    QCOMPARE(map1.count(), map2.count());
    QVERIFY(map1.remove(42,5));
    QVERIFY(map2.remove(42,5));
    QVERIFY(map1 == map2);
    }
}

template <typename T>
QList<T> sorted(const QList<T> &list)
{
    QList<T> res = list;
    qSort(res);
    return res;
}

void tst_QHash::keys_values_uniqueKeys()
{
    QHash<QString, int> hash;
    QVERIFY(hash.uniqueKeys().isEmpty());
    QVERIFY(hash.keys().isEmpty());
    QVERIFY(hash.values().isEmpty());

    hash.insertMulti("alpha", 1);
    QVERIFY(sorted(hash.keys()) == (QList<QString>() << "alpha"));
    QVERIFY(hash.keys() == hash.uniqueKeys());
    QVERIFY(hash.values() == (QList<int>() << 1));

    hash.insertMulti("beta", -2);
    QVERIFY(sorted(hash.keys()) == (QList<QString>() << "alpha" << "beta"));
    QVERIFY(hash.keys() == hash.uniqueKeys());
    QVERIFY(sorted(hash.values()) == sorted(QList<int>() << 1 << -2));

    hash.insertMulti("alpha", 2);
    QVERIFY(sorted(hash.uniqueKeys()) == (QList<QString>() << "alpha" << "beta"));
    QVERIFY(sorted(hash.keys()) == (QList<QString>() << "alpha" << "alpha" << "beta"));
    QVERIFY(sorted(hash.values()) == sorted(QList<int>() << 2 << 1 << -2));

    hash.insertMulti("beta", 4);
    QVERIFY(sorted(hash.uniqueKeys()) == (QList<QString>() << "alpha" << "beta"));
    QVERIFY(sorted(hash.keys()) == (QList<QString>() << "alpha" << "alpha" << "beta" << "beta"));
    QVERIFY(sorted(hash.values()) == sorted(QList<int>() << 2 << 1 << 4 << -2));
}

void tst_QHash::noNeedlessRehashes()
{
    QHash<int, int> hash;
    for (int i = 0; i < 512; ++i) {
        int j = (i * 345) % 512;
        hash.insert(j, j);
        int oldCapacity = hash.capacity();
        hash[j] = j + 1;
        QCOMPARE(oldCapacity, hash.capacity());
        hash.insert(j, j + 1);
        QCOMPARE(oldCapacity, hash.capacity());
    }
}

QTEST_APPLESS_MAIN(tst_QHash)
#include "tst_qhash.moc"