1 files changed, 95 insertions, 0 deletions
diff --git a/tests/benchmarks/corelib/io/qtextstream/tst_bench_qtextstream.cpp b/tests/benchmarks/corelib/io/qtextstream/tst_bench_qtextstream.cpp
new file mode 100644
index 0000000000..74552b85cf
--- /dev/null
+++ b/tests/benchmarks/corelib/io/qtextstream/tst_bench_qtextstream.cpp
@@ -0,0 +1,95 @@
+// Copyright (C) 2014 David Faure <david.faure@kdab.com>
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+#include <QDebug>
+#include <QIODevice>
+#include <QString>
+#include <QBuffer>
+#include <qtest.h>
+
+class tst_QTextStream : public QObject
+{
+    Q_OBJECT
+private slots:
+    void writeSingleChar_data();
+    void writeSingleChar();
+
+private:
+};
+
+enum Output { StringOutput, DeviceOutput };
+Q_DECLARE_METATYPE(Output);
+
+enum Input { CharStarInput, QStringInput, CharInput, QCharInput };
+Q_DECLARE_METATYPE(Input);
+
+void tst_QTextStream::writeSingleChar_data()
+{
+    QTest::addColumn<Output>("output");
+    QTest::addColumn<Input>("input");
+
+    QTest::newRow("string_charstar") << StringOutput << CharStarInput;
+    QTest::newRow("string_string") << StringOutput << QStringInput;
+    QTest::newRow("string_char") << StringOutput << CharInput;
+    QTest::newRow("string_qchar") << StringOutput << QCharInput;
+    QTest::newRow("device_charstar") << DeviceOutput << CharStarInput;
+    QTest::newRow("device_string") << DeviceOutput << QStringInput;
+    QTest::newRow("device_char") << DeviceOutput << CharInput;
+    QTest::newRow("device_qchar") << DeviceOutput << QCharInput;
+}
+
+void tst_QTextStream::writeSingleChar()
+{
+    QFETCH(Output, output);
+    QFETCH(Input, input);
+
+    QString str;
+    QBuffer buffer;
+    QTextStream stream;
+    if (output == StringOutput) {
+        stream.setString(&str, QIODevice::WriteOnly);
+    } else {
+        QVERIFY(buffer.open(QIODevice::WriteOnly));
+        stream.setDevice(&buffer);
+    }
+    // Test many different ways to write a single char into a QTextStream
+    QString inputString = "h";
+    const int amount = 100000;
+    switch (input) {
+    case CharStarInput:
+        QBENCHMARK {
+            for (qint64 i = 0; i < amount; ++i)
+                stream << "h";
+        }
+        break;
+    case QStringInput:
+        QBENCHMARK {
+            for (qint64 i = 0; i < amount; ++i)
+                stream << inputString;
+        }
+        break;
+    case CharInput:
+        QBENCHMARK {
+            for (qint64 i = 0; i < amount; ++i)
+                stream << 'h';
+        }
+        break;
+    case QCharInput:
+        QBENCHMARK {
+            for (qint64 i = 0; i < amount; ++i)
+                stream << QChar('h');
+        }
+        break;
+    }
+    QString result;
+    if (output == StringOutput)
+        result = str;
+    else
+        result = QString(buffer.data());
+
+    QCOMPARE(result.left(10), QString("hhhhhhhhhh"));
+}
+
+QTEST_MAIN(tst_QTextStream)
+
+#include "tst_bench_qtextstream.moc"