1 files changed, 14 insertions, 0 deletions
diff --git a/tests/auto/corelib/tools/qcache/tst_qcache.cpp b/tests/auto/corelib/tools/qcache/tst_qcache.cpp
index 54cf00f9da..da6f1bb34b 100644
--- a/tests/auto/corelib/tools/qcache/tst_qcache.cpp
+++ b/tests/auto/corelib/tools/qcache/tst_qcache.cpp
@@ -49,6 +49,7 @@ private slots:
     void axioms_on_key_type();
     void largeCache();
     void internalChainOrderAfterEntryUpdate();
+    void emplaceLowerCost();
 };
 
 
@@ -431,5 +432,18 @@ void tst_QCache::internalChainOrderAfterEntryUpdate()
     QCOMPARE(cache.size(), 0);
 }
 
+void tst_QCache::emplaceLowerCost()
+{
+    QCache<QString, int> cache;
+    cache.setMaxCost(5);
+    cache.insert("a", new int, 3); // insert high cost
+    cache.insert("a", new int, 1); // and then exchange it with a lower-cost object
+    QCOMPARE(cache.totalCost(), 1);
+    cache.remove("a"); // then remove the object
+    // The cache should now have a cost == 0 and be empty.
+    QCOMPARE(cache.totalCost(), 0);
+    QVERIFY(cache.isEmpty());
+}
+
 QTEST_APPLESS_MAIN(tst_QCache)
 #include "tst_qcache.moc"