QTestlib: Enable comparing QList against initializer lists/arrays

It is unnecessary to create a QList container just for comparison.

Split out helpers for comparing sequence sizes and sequences from
qCompare(QList) and add a template for an array with a non-type template
parameter for the size.

One can then write something like:

const int expected[] = {10, 12,...};
QCOMPARE(QFontDatabase.pointSizes(...), expected)

Unfortunately, any commas in such an array will be misread by macro expansion
as macro argument separators, so any expected array with more than one entry
needs an extra macro expanding __VA_ARGS__.

Change-Id: Ie7c8dc20bf669bbb25f6d7f8562455f8d03968c8
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/src/testlib/doc/snippets/code/src_qtestlib_qtestcase.cpp b/src/testlib/doc/snippets/code/src_qtestlib_qtestcase.cpp
index cfa999a6f4..01f4e11eb4 100644
--- a/src/testlib/doc/snippets/code/src_qtestlib_qtestcase.cpp
+++ b/src/testlib/doc/snippets/code/src_qtestlib_qtestcase.cpp
@@ -49,6 +49,9 @@
 ****************************************************************************/
 #include <QTest>
 #include <QSqlDatabase>
+#include <QtGui/qfontdatabase.h>
+
+#include <initializer_list>
 
 // dummy
 class TestBenchmark : public QObject
@@ -246,3 +249,20 @@ QVERIFY2(file.open(QIODevice::WriteOnly),
                     .arg(file.fileName()).arg(file.errorString())));
 //! [33]
 }
+
+void compareListToArray()
+{
+//! [34]
+    const int expected[] = {8, 10, 12, 16, 20, 24};
+    QCOMPARE(QFontDatabase::standardSizes(), expected);
+//! [34]
+}
+
+void compareListToInitializerList()
+{
+//! [35]
+ #define ARG(...) __VA_ARGS__
+     QCOMPARE(QFontDatabase::standardSizes(), ARG({8, 10, 12, 16, 20, 24}));
+ #undef ARG
+//! [35]
+}