Add callbacks for initialisation and cleanup of a test function before and after *all* data rows have run

  // If we load the QML from scratch every test, each row takes ~350ms.
  // However, we still want it to be data-driven (so that e.g. you can
  // run individual rows), so we store it here and create it once at startup
  // rather than loop through a list in changeSignals.

#include <QtTest>

class foo : public QObject
{
    Q_OBJECT

public:
    foo();
    ~foo();

private slots:
    void initTestCase();
    void cleanupTestCase();

    void init();
    void cleanup();

    void test_changeSignals_data();
    void test_changeSignals();

private:
    // Some pointer that is new'd in initTestCase and should be destroyed after
    // all data rows have run for the function
};

foo::foo() {}

foo::~foo() {}

void foo::initTestCase() {}

void foo::cleanupTestCase() {}

void foo::init()
{
    qDebug() << "init" << QTest::currentTestFunction() << QTest::currentDataTag();
}

void foo::cleanup()
{
    qDebug() << "cleanup" << QTest::currentTestFunction() << QTest::currentDataTag();
}

void foo::test_changeSignals_data()
{
    QTest::addColumn<QVariant>("propertyValue");

    QTest::newRow("a") << QVariant::fromValue(1);
    QTest::newRow("b") << QVariant::fromValue(1);
}

void foo::test_changeSignals() {
    QFETCH(const QVariant, propertyValue);
}

QTEST_APPLESS_MAIN(foo)

#include "tst_foo.moc"