Make QContiguousCache with zero capacity not crash

These containers don't make sense and will just result in no action
being taken (all items added will simply be discarded), but it
shouldn't crash due to a division by zero.

Task-number: QTBUG-27339
Change-Id: Ib9acf5c0a9a826e6853e7beaf5e56511fde98dc6
(cherry-picked from qt5 commit 320c4e31e124f99601399d00935362b587c77510)
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>

1 files changed, 21 insertions, 0 deletions

diff --git a/tests/auto/qcontiguouscache/tst_qcontiguouscache.cpp b/tests/auto/qcontiguouscache/tst_qcontiguouscache.cpp
index 437f140..a538a13 100644
--- a/tests/auto/qcontiguouscache/tst_qcontiguouscache.cpp
+++ b/tests/auto/qcontiguouscache/tst_qcontiguouscache.cpp
@@ -70,6 +70,7 @@ private slots:
     void setCapacity();
 
     void zeroCapacity();
+    void modifyZeroCapacityCache();
 };
 
 QTEST_MAIN(tst_QContiguousCache)
@@ -368,4 +369,24 @@ void tst_QContiguousCache::zeroCapacity()
     QCOMPARE(contiguousCache.capacity(),0);
 }
 
+void tst_QContiguousCache::modifyZeroCapacityCache()
+{
+    {
+        QContiguousCache<int> contiguousCache;
+        contiguousCache.insert(0, 42);
+    }
+    {
+        QContiguousCache<int> contiguousCache;
+        contiguousCache.insert(1, 42);
+    }
+    {
+        QContiguousCache<int> contiguousCache;
+        contiguousCache.append(42);
+    }
+    {
+        QContiguousCache<int> contiguousCache;
+        contiguousCache.prepend(42);
+    }
+}
+
 #include "tst_qcontiguouscache.moc"