QHashFunctions: test for hash equality of null and empty string types

In Qt, null QStrings compare equal to empty ones, so add an explicit
check that the corresponding hash values are identical, too.

Ditto for QByteArray.

Change-Id: I190fc95a765305928d9b6b0e4955433865b6b247
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp b/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
index bde9433a24..4d61bc393d 100644
--- a/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
+++ b/tests/auto/corelib/tools/qhashfunctions/tst_qhashfunctions.cpp
@@ -45,6 +45,8 @@ class tst_QHashFunctions : public QObject
     Q_OBJECT
 private Q_SLOTS:
     void qhash();
+    void qhash_of_empty_and_null_qstring();
+    void qhash_of_empty_and_null_qbytearray();
     void fp_qhash_of_zero_is_zero();
     void qthash_data();
     void qthash();
@@ -117,6 +119,20 @@ void tst_QHashFunctions::qhash()
     }
 }
 
+void tst_QHashFunctions::qhash_of_empty_and_null_qstring()
+{
+    QString null, empty("");
+    QCOMPARE(null, empty);
+    QCOMPARE(qHash(null), qHash(empty));
+}
+
+void tst_QHashFunctions::qhash_of_empty_and_null_qbytearray()
+{
+    QByteArray null, empty("");
+    QCOMPARE(null, empty);
+    QCOMPARE(qHash(null), qHash(empty));
+}
+
 void tst_QHashFunctions::fp_qhash_of_zero_is_zero()
 {
     QCOMPARE(qHash(-0.0f), 0U);