Extend QTest::failOnWarning() to a no-parameter fail-on-any-warning

Many users (albeit mostly in qtdeclarative) of failOnWarning() are
passing a catch-all regexp, which is only supported when regular
expression support is enabled. Make their lives easier and those
checks independent of the feature by adding a third overload, taking
no parameter, that fails on any (unanticipated) warning.

Implementation is trivial - just put a null QVariant in
failOnWarningList; it won't match either check on the entry that might
exempt a test from failing on a warning, so any warning at all will
trigger failure.

[ChangeLog][QtTest] QTest::failOnWarning() now has a no-parameter
overload to support the common case of fail-on-any-warning, without
needing to construct a match-everything regular expression.

Change-Id: Ic693f1c8619fd6e495543b85737d566134cf9d20
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

4 files changed, 31 insertions, 1 deletions

diff --git a/src/testlib/qtestcase.cpp b/src/testlib/qtestcase.cpp
index 2ab55cac36..5648fedd63 100644
--- a/src/testlib/qtestcase.cpp
+++ b/src/testlib/qtestcase.cpp
@@ -2202,6 +2202,19 @@ void QTest::ignoreMessage(QtMsgType type, const QRegularExpression &messagePatte
 #endif // QT_CONFIG(regularexpression)
 
 /*!
+    \since 6.8
+    \overload failOnWarning()
+
+    Appends a test failure to the test log if any warning is output.
+
+    \sa failOnWarning()
+*/
+void QTest::failOnWarning()
+{
+    return QTestLog::failOnWarning();
+}
+
+/*!
     \since 6.3
     \overload failOnWarning()
 
@@ -2247,7 +2260,17 @@ void QTest::failOnWarning(const char *message)
     \code
     void FileTest::init()
     {
-        QTest::failOnWarning(QRegularExpression(".?"));
+        QTest::failOnWarning(
+            QRegularExpression("QFile::.*: File(.*) already open"));
+    }
+    \endcode
+
+    For the common case of failing on \e any warning pass no parameter:
+
+    \code
+    void FileTest::init()
+    {
+        QTest::failOnWarning();
     }
     \endcode
 
diff --git a/src/testlib/qtestcase.h b/src/testlib/qtestcase.h
index 0ae1a787e2..a855ace6a9 100644
--- a/src/testlib/qtestcase.h
+++ b/src/testlib/qtestcase.h
@@ -435,6 +435,7 @@ namespace QTest
 #if QT_CONFIG(regularexpression)
     Q_TESTLIB_EXPORT void ignoreMessage(QtMsgType type, const QRegularExpression &messagePattern);
 #endif
+    Q_TESTLIB_EXPORT void failOnWarning();
     Q_TESTLIB_EXPORT void failOnWarning(const char *message);
 #if QT_CONFIG(regularexpression)
     Q_TESTLIB_EXPORT void failOnWarning(const QRegularExpression &messagePattern);
diff --git a/src/testlib/qtestlog.cpp b/src/testlib/qtestlog.cpp
index 4b6df54e91..929ccb370b 100644
--- a/src/testlib/qtestlog.cpp
+++ b/src/testlib/qtestlog.cpp
@@ -629,6 +629,11 @@ void QTestLog::ignoreMessage(QtMsgType type, const QRegularExpression &expressio
 }
 #endif // QT_CONFIG(regularexpression)
 
+void QTestLog::failOnWarning()
+{
+    QTest::failOnWarningList.push_back({});
+}
+
 void QTestLog::failOnWarning(const char *msg)
 {
     QTest::failOnWarningList.push_back(QString::fromUtf8(msg));
diff --git a/src/testlib/qtestlog_p.h b/src/testlib/qtestlog_p.h
index f9bbfa158d..ab5fb593d4 100644
--- a/src/testlib/qtestlog_p.h
+++ b/src/testlib/qtestlog_p.h
@@ -71,6 +71,7 @@ public:
 #ifndef QT_NO_REGULAREXPRESSION
     static void ignoreMessage(QtMsgType type, const QRegularExpression &expression);
 #endif
+    static void failOnWarning();
     static void failOnWarning(const char *msg);
 #ifndef QT_NO_REGULAREXPRESSION
     static void failOnWarning(const QRegularExpression &expression);