Fix crash with SignalTransition

Don't crash when using SignalTransition with a signal object instead of the
slot used to emit the signal. A signal object is just as good.

Task-number: QTBUG-53596
Change-Id: I8a419d16ec0c257c9a798a83ee5bad338794cdd2
Reviewed-by: Michael Brasser <michael.brasser@live.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/tests/auto/qmltest/statemachine/tst_signaltransition.qml b/tests/auto/qmltest/statemachine/tst_signaltransition.qml
new file mode 100644
index 0000000000..0e35207670
--- /dev/null
+++ b/tests/auto/qmltest/statemachine/tst_signaltransition.qml
@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Ford Motor Company
+** Copyright (C) 2016 The Qt Company
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtTest 1.1
+import QtQml.StateMachine 1.0
+
+TestCase {
+    id: testCase
+    StateMachine {
+        id: machine
+        initialState: startState
+        State {
+            id: startState
+            SignalTransition {
+                id: signalTrans
+                signal: testCase.onMysignal
+                targetState: finalState
+            }
+        }
+        FinalState {
+            id: finalState
+        }
+    }
+
+    SignalSpy {
+        id: finalStateActive
+        target: finalState
+        signalName: "activeChanged"
+    }
+
+    signal mysignal()
+
+    name: "testSignalTransition"
+    function test_signalTransition()
+    {
+        // Start statemachine, should not have reached finalState yet.
+        machine.start()
+        tryCompare(finalStateActive, "count", 0)
+        tryCompare(machine, "running", true)
+
+        testCase.mysignal()
+        tryCompare(finalStateActive, "count", 1)
+        tryCompare(machine, "running", false)
+    }
+}