Check if device is opened before trying to create image handler.

Change-Id: I60f1f6890fdd73e489da4aab9928370163f55f58
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: aavit <eirik.aavitsland@digia.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/auto/gui/image/qimagewriter/tst_qimagewriter.cpp b/tests/auto/gui/image/qimagewriter/tst_qimagewriter.cpp
index f1d0e227f6..b10b5704c3 100644
--- a/tests/auto/gui/image/qimagewriter/tst_qimagewriter.cpp
+++ b/tests/auto/gui/image/qimagewriter/tst_qimagewriter.cpp
@@ -50,6 +50,7 @@
 #include <QImageWriter>
 #include <QPainter>
 #include <QSet>
+#include <QTemporaryDir>
 
 #ifdef Q_OS_UNIX // for geteuid()
 # include <sys/types.h>
@@ -84,6 +85,7 @@ private slots:
     void supportedMimeTypes();
 
     void writeToInvalidDevice();
+    void testCanWrite();
 
     void supportsOption_data();
     void supportsOption();
@@ -402,6 +404,28 @@ void tst_QImageWriter::writeToInvalidDevice()
     }
 }
 
+void tst_QImageWriter::testCanWrite()
+{
+    {
+        // device is not set
+        QImageWriter writer;
+        QVERIFY(!writer.canWrite());
+        QCOMPARE(writer.error(), QImageWriter::DeviceError);
+    }
+
+    {
+        // check if canWrite won't leave an empty file
+        QTemporaryDir dir;
+        QVERIFY(dir.isValid());
+        QString fileName(dir.path() + QLatin1String("/001.garble"));
+        QVERIFY(!QFileInfo(fileName).exists());
+        QImageWriter writer(fileName);
+        QVERIFY(!writer.canWrite());
+        QCOMPARE(writer.error(), QImageWriter::UnsupportedFormatError);
+        QVERIFY(!QFileInfo(fileName).exists());
+    }
+}
+
 void tst_QImageWriter::supportsOption_data()
 {
     QTest::addColumn<QString>("fileName");