Split QTest::qExec()

Split into (internal) QTest::qInit(), qRun(), and qCleanup(), that
allow qtquickcontrols2 to initialize the test framework once, repeat
the tests for all built-in styles (Default, Material, Universal), and
finally cleanup things:

    $ ./tst_qquickbutton text
    ********* Start testing of tst_QQuickButton *********
    Config: Using QtTest library 5.10.0, Qt 5.10.0 (...)
    PASS   : tst_QQuickButton::Default::initTestCase()
    PASS   : tst_QQuickButton::Default::text()
    PASS   : tst_QQuickButton::Default::cleanupTestCase()
    PASS   : tst_QQuickButton::Material::initTestCase()
    PASS   : tst_QQuickButton::Material::text()
    PASS   : tst_QQuickButton::Material::cleanupTestCase()
    PASS   : tst_QQuickButton::Universal::initTestCase()
    PASS   : tst_QQuickButton::Universal::text()
    PASS   : tst_QQuickButton::Universal::cleanupTestCase()
    Totals: 9 passed, 0 failed, 0 skipped, 0 blacklisted, 2215ms
    ********* Finished testing of tst_QQuickButton *********

Notice that QTest::qExec() cannot be called multiple times, because
it would print the headers/footers/results separately for each round.

Change-Id: Ibb24b694491d4e790db32e40837c3a5c6d9d2840
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

0 files changed, 0 insertions, 0 deletions