add autotest for adding transition from state machine's root

It's not supported because the root state has no ancestor,
which is a requirement for the state machine's transition
selection algorithm.

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/auto/qstatemachine/tst_qstatemachine.cpp b/tests/auto/qstatemachine/tst_qstatemachine.cpp
index efcb983..bafd848 100644
--- a/tests/auto/qstatemachine/tst_qstatemachine.cpp
+++ b/tests/auto/qstatemachine/tst_qstatemachine.cpp
@@ -127,6 +127,7 @@ private slots:
     void targetStateWithNoParent();
     void targetStateDeleted();
     void transitionToRootState();
+    void transitionFromRootState();
     void transitionEntersParent();
     
     void defaultErrorState();
@@ -279,6 +280,15 @@ void tst_QStateMachine::transitionToRootState()
     QVERIFY(machine.configuration().contains(initialState));
 }
 
+void tst_QStateMachine::transitionFromRootState()
+{
+    QStateMachine machine;
+    QState *root = machine.rootState();
+    QState *s1 = new QState(root);
+    QTest::ignoreMessage(QtWarningMsg, "QState::addTransition: cannot add transition from root state");
+    root->addTransition(new EventTransition(QEvent::User, s1));
+}
+
 void tst_QStateMachine::transitionEntersParent()
 {
     QStateMachine machine;