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>

src/testlib/qtestcase.cpp

@@ -275,6 +275,11 @@ namespace QTest
     static QObject *currentTestObject = 0;
     static QString mainSourcePath;
 
+#if defined(Q_OS_MACOS)
+    bool macNeedsActivate = false;
+    IOPMAssertionID powerID;
+#endif
+
     class TestMethods {
         Q_DISABLE_COPY(TestMethods)
     public:
@@ -1357,9 +1362,7 @@ void TestMethods::invokeTests(QObject *testObject) const
 {
     const QMetaObject *metaObject = testObject->metaObject();
     QTEST_ASSERT(metaObject);
-    QTestLog::startLogging();
     QTestResult::setCurrentTestFunction("initTestCase");
-    QTestTable::globalTestTable();
     if (m_initTestCaseDataMethod.isValid())
         m_initTestCaseDataMethod.invoke(testObject, Qt::DirectConnection);
 
@@ -1404,9 +1407,6 @@ void TestMethods::invokeTests(QObject *testObject) const
     }
     QTestResult::finishedCurrentTestFunction();
     QTestResult::setCurrentTestFunction(0);
-    QTestTable::clearGlobalTestTable();
-
-    QTestLog::stopLogging();
 }
 
 #if defined(Q_OS_UNIX)
@@ -1710,24 +1710,25 @@ static void initEnvironment()
 
 int QTest::qExec(QObject *testObject, int argc, char **argv)
 {
-    initEnvironment();
-    QBenchmarkGlobalData benchmarkData;
-    QBenchmarkGlobalData::current = &benchmarkData;
+    qInit(testObject, argc, argv);
+    int ret = qRun();
+    qCleanup();
+    return ret;
+}
 
-#ifdef QTESTLIB_USE_VALGRIND
-    int callgrindChildExitCode = 0;
-#endif
+/*! \internal
+ */
+void QTest::qInit(QObject *testObject, int argc, char **argv)
+{
+    initEnvironment();
+    QBenchmarkGlobalData::current = new QBenchmarkGlobalData;
 
 #if defined(Q_OS_MACX)
-    bool macNeedsActivate = qApp && (qstrcmp(qApp->metaObject()->className(), "QApplication") == 0);
-    IOPMAssertionID powerID;
+    macNeedsActivate = qApp && (qstrcmp(qApp->metaObject()->className(), "QApplication") == 0);
 
     // Don't restore saved window state for auto tests.
     QTestPrivate::disableWindowRestore();
 #endif
-#ifndef QT_NO_EXCEPTIONS
-    try {
-#endif
 
 #if defined(Q_OS_MACX)
     if (macNeedsActivate) {
@@ -1757,6 +1758,24 @@ int QTest::qExec(QObject *testObject, int argc, char **argv)
 
     qtest_qParseArgs(argc, argv, false);
 
+    QTestTable::globalTestTable();
+    QTestLog::startLogging();
+}
+
+/*! \internal
+ */
+int QTest::qRun()
+{
+    QTEST_ASSERT(currentTestObject);
+
+#ifdef QTESTLIB_USE_VALGRIND
+    int callgrindChildExitCode = 0;
+#endif
+
+#ifndef QT_NO_EXCEPTIONS
+    try {
+#endif
+
 #if defined(Q_OS_WIN)
     if (!noCrashHandler) {
 # ifndef Q_CC_MINGW
@@ -1792,17 +1811,17 @@ int QTest::qExec(QObject *testObject, int argc, char **argv)
         for (const QString &tf : qAsConst(QTest::testFunctions)) {
                 const QByteArray tfB = tf.toLatin1();
                 const QByteArray signature = tfB + QByteArrayLiteral("()");
-                QMetaMethod m = TestMethods::findMethod(testObject, signature.constData());
+                QMetaMethod m = TestMethods::findMethod(currentTestObject, signature.constData());
                 if (!m.isValid() || !isValidSlot(m)) {
                     fprintf(stderr, "Unknown test function: '%s'. Possible matches:\n", tfB.constData());
                     qPrintTestSlots(stderr, tfB.constData());
-                    fprintf(stderr, "\n%s -functions\nlists all available test functions.\n", argv[0]);
+                    fprintf(stderr, "\n%s -functions\nlists all available test functions.\n", QTestResult::currentAppName());
                     exit(1);
                 }
                 commandLineMethods.push_back(m);
         }
-        TestMethods test(testObject, commandLineMethods);
-        test.invokeTests(testObject);
+        TestMethods test(currentTestObject, commandLineMethods);
+        test.invokeTests(currentTestObject);
     }
 
 #ifndef QT_NO_EXCEPTIONS
@@ -1827,16 +1846,6 @@ int QTest::qExec(QObject *testObject, int argc, char **argv)
      }
 #endif
 
-    currentTestObject = 0;
-
-    QSignalDumper::endDump();
-
-#if defined(Q_OS_MACX)
-     if (macNeedsActivate) {
-         IOPMAssertionRelease(powerID);
-     }
-#endif
-
 #ifdef QTESTLIB_USE_VALGRIND
     if (QBenchmarkGlobalData::current->mode() == QBenchmarkGlobalData::CallgrindParentProcess)
         return callgrindChildExitCode;
@@ -1846,6 +1855,26 @@ int QTest::qExec(QObject *testObject, int argc, char **argv)
     return qMin(QTestLog::failCount(), 127);
 }
 
+/*! \internal
+ */
+void QTest::qCleanup()
+{
+    currentTestObject = 0;
+
+    QTestTable::clearGlobalTestTable();
+    QTestLog::stopLogging();
+
+    delete QBenchmarkGlobalData::current;
+    QBenchmarkGlobalData::current = 0;
+
+    QSignalDumper::endDump();
+
+#if defined(Q_OS_MACOS)
+    if (macNeedsActivate)
+        IOPMAssertionRelease(powerID);
+#endif
+}
+
 /*!
   \overload
   \since 4.4

src/testlib/qtestcase.h

@@ -281,6 +281,10 @@ namespace QTest
     Q_TESTLIB_EXPORT char *toString(const char *);
     Q_TESTLIB_EXPORT char *toString(const void *);
 
+    Q_TESTLIB_EXPORT void qInit(QObject *testObject, int argc = 0, char **argv = Q_NULLPTR);
+    Q_TESTLIB_EXPORT int qRun();
+    Q_TESTLIB_EXPORT void qCleanup();
+
     Q_TESTLIB_EXPORT int qExec(QObject *testObject, int argc = 0, char **argv = Q_NULLPTR);
     Q_TESTLIB_EXPORT int qExec(QObject *testObject, const QStringList &arguments);