1 files changed, 65 insertions, 0 deletions
diff --git a/tests/auto/gui/kernel/qpalette/tst_qpalette.cpp b/tests/auto/gui/kernel/qpalette/tst_qpalette.cpp
index 150d58e6f4..897511300b 100644
--- a/tests/auto/gui/kernel/qpalette/tst_qpalette.cpp
+++ b/tests/auto/gui/kernel/qpalette/tst_qpalette.cpp
@@ -22,6 +22,7 @@ private Q_SLOTS:
     void noBrushesSetForDefaultPalette();
     void cannotCheckIfInvalidBrushSet();
     void checkIfBrushForCurrentGroupSet();
+    void cacheKey();
 };
 
 void tst_QPalette::roleValues_data()
@@ -264,5 +265,69 @@ void tst_QPalette::checkIfBrushForCurrentGroupSet()
     QVERIFY(p.isBrushSet(QPalette::Current, QPalette::Link));
 }
 
+void tst_QPalette::cacheKey()
+{
+    const QPalette defaultPalette;
+    // precondition: all palettes are expected to have contrasting text on base
+    QVERIFY(defaultPalette.base() != defaultPalette.text());
+    const auto defaultCacheKey = defaultPalette.cacheKey();
+    const auto defaultSerNo = defaultCacheKey >> 32;
+    const auto defaultDetachNo = defaultCacheKey & 0xffffffff;
+
+    QPalette changeTwicePalette(defaultPalette);
+    changeTwicePalette.setBrush(QPalette::All, QPalette::ButtonText, Qt::red);
+    const auto firstChangeCacheKey = changeTwicePalette.cacheKey();
+    QCOMPARE_NE(firstChangeCacheKey, defaultCacheKey);
+    changeTwicePalette.setBrush(QPalette::All, QPalette::ButtonText, Qt::green);
+    const auto secondChangeCacheKey = changeTwicePalette.cacheKey();
+    QCOMPARE_NE(firstChangeCacheKey, secondChangeCacheKey);
+
+    QPalette copyDifferentData(defaultPalette);
+    QPalette copyDifferentMask(defaultPalette);
+    QPalette copyDifferentMaskAndData(defaultPalette);
+
+    QCOMPARE(defaultPalette.cacheKey(), copyDifferentData.cacheKey());
+
+    // deep detach of both private and data
+    copyDifferentData.setBrush(QPalette::Base, defaultPalette.text());
+    const auto differentDataKey = copyDifferentData.cacheKey();
+    const auto differentDataSerNo = differentDataKey >> 32;
+    const auto differentDataDetachNo = differentDataKey & 0xffffffff;
+
+    QCOMPARE_NE(copyDifferentData.cacheKey(), defaultCacheKey);
+    QCOMPARE(defaultPalette.cacheKey(), defaultCacheKey);
+
+    // shallow detach, both privates reference the same data
+    copyDifferentMask.setResolveMask(0xffffffffffffffff);
+    const auto differentMaskKey = copyDifferentMask.cacheKey();
+    const auto differentMaskSerNo = differentMaskKey >> 32;
+    const auto differentMaskDetachNo = differentMaskKey & 0xffffffff;
+    QCOMPARE(differentMaskSerNo, defaultSerNo);
+    QCOMPARE_NE(differentMaskSerNo, defaultDetachNo);
+    QCOMPARE_NE(differentMaskKey, defaultCacheKey);
+    QCOMPARE_NE(differentMaskKey, differentDataKey);
+
+    // shallow detach, both privates reference the same data
+    copyDifferentMaskAndData.setResolveMask(0xeeeeeeeeeeeeeeee);
+    const auto modifiedCacheKey = copyDifferentMaskAndData.cacheKey();
+    QCOMPARE_NE(modifiedCacheKey, copyDifferentMask.cacheKey());
+    QCOMPARE_NE(modifiedCacheKey, defaultCacheKey);
+    QCOMPARE_NE(modifiedCacheKey, copyDifferentData.cacheKey());
+    QCOMPARE_NE(copyDifferentMask.cacheKey(), defaultCacheKey);
+
+    // full detach - both key elements are different
+    copyDifferentMaskAndData.setBrush(QPalette::Base, defaultPalette.text());
+    const auto modifiedAllKey = copyDifferentMaskAndData.cacheKey();
+    const auto modifiedAllSerNo = modifiedAllKey >> 32;
+    const auto modifiedAllDetachNo = modifiedAllKey & 0xffffffff;
+    QCOMPARE_NE(modifiedAllSerNo, defaultSerNo);
+    QCOMPARE_NE(modifiedAllDetachNo, defaultDetachNo);
+
+    QCOMPARE_NE(modifiedAllKey, copyDifferentMask.cacheKey());
+    QCOMPARE_NE(modifiedAllKey, defaultCacheKey);
+    QCOMPARE_NE(modifiedAllKey, differentDataKey);
+    QCOMPARE_NE(modifiedAllKey, modifiedCacheKey);
+}
+
 QTEST_MAIN(tst_QPalette)
 #include "tst_qpalette.moc"