QDuplicateTracker: test with std::string, too

std::string is a nice value_type for when you want to track short
strings (because of its SSO). Check that it works, incl. in case
the implementation falls back to QSet in the absence of std::pmr
support in the stdlib.

Change-Id: I2406258355295c2b1300c4ae8001cead59bb27d6
Reviewed-by: Thiago Macieira <[email protected]>
(cherry picked from commit fe8c8e0fceec09b6ac6f358d522aeae9a5550bd0)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>
(cherry picked from commit 3446ece05671b050f2fa520a966c98a0c30c6615)
(cherry picked from commit 4d8b7b584a61cf9cfc202b0b92f4878680bca757)

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/auto/corelib/tools/qduplicatetracker/tst_qduplicatetracker.cpp b/tests/auto/corelib/tools/qduplicatetracker/tst_qduplicatetracker.cpp
index 8ea4802fa4c..4c71278a59d 100644
--- a/tests/auto/corelib/tools/qduplicatetracker/tst_qduplicatetracker.cpp
+++ b/tests/auto/corelib/tools/qduplicatetracker/tst_qduplicatetracker.cpp
@@ -6,6 +6,8 @@
 #include <QtCore/private/qduplicatetracker_p.h>
 
 #include <QObject>
+
+#include <string>
 #include <utility>
 
 class tst_QDuplicateTracker : public QObject
@@ -50,6 +52,27 @@ void tst_QDuplicateTracker::hasSeen()
         QVERIFY(!tracker.hasSeen(string3));
         QVERIFY(tracker.hasSeen(string3));
     }
+
+    {
+        QDuplicateTracker<std::string, 2> tracker;
+        std::string string1("string1");
+        std::string string2("string2");
+        std::string string2_2("string2");
+        std::string string3("string3");
+
+        // Move when seen
+        QVERIFY(!tracker.hasSeen(string1));
+        QVERIFY(tracker.hasSeen(std::move(string1)));
+
+        // Move when unseen
+        QVERIFY(!tracker.hasSeen(std::move(string2)));
+        QVERIFY(tracker.hasSeen(string2_2));
+
+        // Past the prealloc amount
+        QVERIFY(!tracker.hasSeen(string3));
+        QVERIFY(tracker.hasSeen(string3));
+    }
+
 }
 
 void tst_QDuplicateTracker::clear()