add tests and benchmarks for QString::toLower()/toUpper()/toCaseFolded()

Merge-request: 70
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

Change-Id: I3929d4d8963c3cef6d2c6420d8ad1f7a45f7e042
Reviewed-by: Olivier
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>

1 files changed, 87 insertions, 5 deletions

diff --git a/tests/auto/corelib/tools/qstring/tst_qstring.cpp b/tests/auto/corelib/tools/qstring/tst_qstring.cpp
index 80e9984690..0c0d756e48 100644
--- a/tests/auto/corelib/tools/qstring/tst_qstring.cpp
+++ b/tests/auto/corelib/tools/qstring/tst_qstring.cpp
@@ -121,8 +121,9 @@ private slots:
     void simplified_data();
     void simplified();
     void trimmed();
-    void toLower();
     void toUpper();
+    void toLower();
+    void toCaseFolded();
     void rightJustified();
     void leftJustified();
     void mid();
@@ -1565,14 +1566,28 @@ void tst_QString::toUpper()
 
     QCOMPARE( QString(1, QChar(0xdf)).toUpper(), QString("SS"));
 
-    QString lower;
+    QString lower, upper;
     lower += QChar(QChar::highSurrogate(0x10428));
     lower += QChar(QChar::lowSurrogate(0x10428));
-    QString upper;
     upper += QChar(QChar::highSurrogate(0x10400));
     upper += QChar(QChar::lowSurrogate(0x10400));
     QCOMPARE( lower.toUpper(), upper);
+    lower += lower;
+    upper += upper;
+    QCOMPARE( lower.toUpper(), upper);
 
+    // test for broken surrogate pair handling (low low hi low hi low)
+    lower.prepend(QChar(QChar::lowSurrogate(0x10428)));
+    lower.prepend(QChar(QChar::lowSurrogate(0x10428)));
+    upper.prepend(QChar(QChar::lowSurrogate(0x10428)));
+    upper.prepend(QChar(QChar::lowSurrogate(0x10428)));
+    QCOMPARE(lower.toUpper(), upper);
+    // test for broken surrogate pair handling (low low hi low hi low hi hi)
+    lower += QChar(QChar::highSurrogate(0x10428));
+    lower += QChar(QChar::highSurrogate(0x10428));
+    upper += QChar(QChar::highSurrogate(0x10428));
+    upper += QChar(QChar::highSurrogate(0x10428));
+    QCOMPARE(lower.toUpper(), upper);
 
 #ifdef QT_USE_ICU
     // test doesn't work with ICU support, since QChar is unaware of any locale
@@ -1610,13 +1625,28 @@ void tst_QString::toLower()
 
     QCOMPARE( QString(1, QChar(0x130)).toLower(), QString(QString(1, QChar(0x69)) + QChar(0x307)));
 
-    QString lower;
+    QString lower, upper;
     lower += QChar(QChar::highSurrogate(0x10428));
     lower += QChar(QChar::lowSurrogate(0x10428));
-    QString upper;
     upper += QChar(QChar::highSurrogate(0x10400));
     upper += QChar(QChar::lowSurrogate(0x10400));
     QCOMPARE( upper.toLower(), lower);
+    lower += lower;
+    upper += upper;
+    QCOMPARE( upper.toLower(), lower);
+
+    // test for broken surrogate pair handling (low low hi low hi low)
+    lower.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    lower.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    upper.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    upper.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    QCOMPARE( upper.toLower(), lower);
+    // test for broken surrogate pair handling (low low hi low hi low hi hi)
+    lower += QChar(QChar::highSurrogate(0x10400));
+    lower += QChar(QChar::highSurrogate(0x10400));
+    upper += QChar(QChar::highSurrogate(0x10400));
+    upper += QChar(QChar::highSurrogate(0x10400));
+    QCOMPARE( upper.toLower(), lower);
 
 #ifdef QT_USE_ICU
     // test doesn't work with ICU support, since QChar is unaware of any locale
@@ -1633,6 +1663,58 @@ void tst_QString::toLower()
 #endif
 }
 
+void tst_QString::toCaseFolded()
+{
+    QCOMPARE( QString().toCaseFolded(), QString() );
+    QCOMPARE( QString("").toCaseFolded(), QString("") );
+    QCOMPARE( QString("text").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("Text").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("tExt").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("teXt").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("texT").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("TExt").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("teXT").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("tEXt").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("tExT").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("TEXT").toCaseFolded(), QString("text") );
+    QCOMPARE( QString("@ABYZ[").toCaseFolded(), QString("@abyz["));
+    QCOMPARE( QString("@abyz[").toCaseFolded(), QString("@abyz["));
+    QCOMPARE( QString("`ABYZ{").toCaseFolded(), QString("`abyz{"));
+    QCOMPARE( QString("`abyz{").toCaseFolded(), QString("`abyz{"));
+
+    QString lower, upper;
+    upper += QChar(QChar::highSurrogate(0x10400));
+    upper += QChar(QChar::lowSurrogate(0x10400));
+    lower += QChar(QChar::highSurrogate(0x10428));
+    lower += QChar(QChar::lowSurrogate(0x10428));
+    QCOMPARE( upper.toCaseFolded(), lower);
+    lower += lower;
+    upper += upper;
+    QCOMPARE( upper.toCaseFolded(), lower);
+
+    // test for broken surrogate pair handling (low low hi low hi low)
+    lower.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    lower.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    upper.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    upper.prepend(QChar(QChar::lowSurrogate(0x10400)));
+    QCOMPARE(upper.toCaseFolded(), lower);
+    // test for broken surrogate pair handling (low low hi low hi low hi hi)
+    lower += QChar(QChar::highSurrogate(0x10400));
+    lower += QChar(QChar::highSurrogate(0x10400));
+    upper += QChar(QChar::highSurrogate(0x10400));
+    upper += QChar(QChar::highSurrogate(0x10400));
+    QCOMPARE(upper.toCaseFolded(), lower);
+
+    //### we currently don't support full case foldings
+    for (int i = 0; i < 65536; ++i) {
+        QString str(1, QChar(i));
+        QString lower = str.toCaseFolded();
+        QVERIFY(lower.length() >= 1);
+        if (lower.length() == 1)
+            QVERIFY(str.toCaseFolded() == QString(1, QChar(i).toCaseFolded()));
+    }
+}
+
 void tst_QString::trimmed()
 {
     QString a;