From 2fa63f352ae9094e6fd12537bffb9ff0b9b2b64a Mon Sep 17 00:00:00 2001
From: Marc Mutz <marc.mutz@qt.io>
Date: Wed, 23 Nov 2022 20:43:08 +0100
Subject: [PATCH] tst_QString: check empty regex can replace in empty/null
 string

It's not intuitive, so check lest people break it.

Change-Id: I2435cd69be7b77a6ae59cdc7b5fb99658cfc42fd
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit d1a37ab0997fbe393fb9cca7158dfa59041f165d)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 tests/auto/corelib/text/qstring/tst_qstring.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/auto/corelib/text/qstring/tst_qstring.cpp b/tests/auto/corelib/text/qstring/tst_qstring.cpp
index e15682e81e9..676ff7c29c7 100644
--- a/tests/auto/corelib/text/qstring/tst_qstring.cpp
+++ b/tests/auto/corelib/text/qstring/tst_qstring.cpp
@@ -856,6 +856,9 @@ void tst_QString::replace_regexp_data()
     // Columns (all QString): string, regexp, after, result; string.replace(regexp, after) == result
     // Test-cases with empty after (replacement text, third column) go in remove_regexp_data()
 
+    QTest::newRow("empty-in-null") << QString() << "" << "after" << "after";
+    QTest::newRow("empty-in-empty") << "" << "" << "after" << "after";
+
     QTest::newRow( "rep00" ) << QString("A <i>bon mot</i>.") << QString("<i>([^<]*)</i>") << QString("\\emph{\\1}") << QString("A \\emph{bon mot}.");
     QTest::newRow( "rep01" ) << QString("banana") << QString("^.a()") << QString("\\1") << QString("nana");
     QTest::newRow( "rep02" ) << QString("banana") << QString("(ba)") << QString("\\1X\\1") << QString("baXbanana");