testlib: Defer signal dumper start until tests are ready to run

We don't want the signal dumper to pick up signals that our own
test machinery produces, such as the ones emitted from the watchdog
thread startup and shutdown. This would otherwise produce:

 tst_Signaldumper::initTestCase() Signal: QThread(7fc969e0d870) started ()

At startup, and at shutdown even more confusingly:

 tst_Signaldumper::UnknownTestFunc() Signal: QThread(7fc969e0d870) finished ()

Change-Id: I9e81fa168eaa92551d38d5576973bbf95ac23364
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/testlib/qsignaldumper_p.h b/src/testlib/qsignaldumper_p.h
index 0f443fd612..e211f5c059 100644
--- a/src/testlib/qsignaldumper_p.h
+++ b/src/testlib/qsignaldumper_p.h
@@ -60,11 +60,14 @@ class QByteArray;
 class QSignalDumper
 {
 public:
+    static void setEnabled(bool);
     static void startDump();
     static void endDump();
 
     static void ignoreClass(const QByteArray &klass);
     static void clearIgnoredClasses();
+private:
+    static bool s_isEnabled;
 };
 
 QT_END_NAMESPACE