Fix regression introduced in c08e708037d33271825ce6a6a1ac640e96b70c36

When writing nothing to a file, not actually writing anything is not an
error.

Also, from a change introduced in the same commit, there is no point in
checking for EOF when writing.

Task-number: QTBUG-5847
Reviewed-by: Olivier Goffart

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/auto/qfile/tst_qfile.cpp b/tests/auto/qfile/tst_qfile.cpp
index b3d6fd917e..d545909da4 100644
--- a/tests/auto/qfile/tst_qfile.cpp
+++ b/tests/auto/qfile/tst_qfile.cpp
@@ -210,6 +210,7 @@ private slots:
     void task167217();
 
     void openDirectory();
+    void writeNothing();
 
 public:
 // disabled this test for the moment... it hangs
@@ -2840,5 +2841,16 @@ void tst_QFile::openStandardStreams()
     }
 }
 
+void tst_QFile::writeNothing()
+{
+    for (int i = 0; i < 3; ++i) {
+        QFile file("file.txt");
+        QVERIFY( openFile(file, QIODevice::WriteOnly | QIODevice::Unbuffered, FileType(i)) );
+        QVERIFY( 0 == file.write((char *)0, 0) );
+        QCOMPARE( file.error(), QFile::NoError );
+        closeFile(file);
+    }
+}
+
 QTEST_MAIN(tst_QFile)
 #include "tst_qfile.moc"