QTest: support nullptr in QCOMPARE

This allows to write
  QCOMPARE(ptr, nullptr);
instead of
  QVERIFY(ptr);

Task-number: QTBUG-49973
Change-Id: I6e1327d4327bcf17bd9b59de4352fdcaae98ac27
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/auto/testlib/selftests/cmptest/tst_cmptest.cpp b/tests/auto/testlib/selftests/cmptest/tst_cmptest.cpp
index 204758f68a..9ada718682 100644
--- a/tests/auto/testlib/selftests/cmptest/tst_cmptest.cpp
+++ b/tests/auto/testlib/selftests/cmptest/tst_cmptest.cpp
@@ -128,6 +128,7 @@ private slots:
     void compare_registered_enums();
     void compare_class_enums();
     void compare_boolfuncs();
+    void compare_to_nullptr();
     void compare_pointerfuncs();
     void compare_tostring();
     void compare_tostring_data();
@@ -180,6 +181,24 @@ void tst_Cmptest::compare_boolfuncs()
     QCOMPARE(!boolfunc(), false);
 }
 
+namespace {
+template <typename T>
+T *null() Q_DECL_NOTHROW { return nullptr; }
+}
+
+void tst_Cmptest::compare_to_nullptr()
+{
+    QCOMPARE(null<int>(), nullptr);
+    QCOMPARE(null<const int>(), nullptr);
+    QCOMPARE(null<volatile int>(), nullptr);
+    QCOMPARE(null<const volatile int>(), nullptr);
+
+    QCOMPARE(nullptr, null<int>());
+    QCOMPARE(nullptr, null<const int>());
+    QCOMPARE(nullptr, null<volatile int>());
+    QCOMPARE(nullptr, null<const volatile int>());
+}
+
 static int i = 0;
 
 static int *intptr() { return &i; }