From 247ec89cc58e66bba5b97ce76ce9686f5a299aa2 Mon Sep 17 00:00:00 2001
From: Ivan Solovev <ivan.solovev@qt.io>
Date: Tue, 6 Aug 2024 14:36:30 +0200
Subject: [PATCH] Test partial_ordering::unordered != 0 comparison

... and figure out that it does not match the std implementation.
Fix will be provided in a follow-up commit.

Task-number: QTBUG-127759
Pick-to: 6.7 6.5 6.2 5.15
Change-Id: I51c4f086af531a81a6aae03f3462972437d41f97
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
(cherry picked from commit fed1099ad2909cb8e75477e60e0a8b41db3f58d0)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 .../corelib/global/qcompare/tst_qcompare.cpp  | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/tests/auto/corelib/global/qcompare/tst_qcompare.cpp b/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
index bb31c01e23a..d28833abb16 100644
--- a/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
+++ b/tests/auto/corelib/global/qcompare/tst_qcompare.cpp
@@ -22,6 +22,7 @@ private slots:
     void conversions();
     void is_eq_overloads();
     void compareThreeWay();
+    void unorderedNeqLiteralZero();
 };
 
 void tst_QCompare::legacyPartialOrdering()
@@ -846,5 +847,46 @@ QT_WARNING_POP
     QCOMPARE_EQ(qCompareThreeWay(arr.data(), a0), Qt::strong_ordering::equivalent);
 }
 
+void tst_QCompare::unorderedNeqLiteralZero()
+{
+    // This test is checking QTBUG-127759
+    constexpr auto qtUnordered = Qt::partial_ordering::unordered;
+    constexpr auto qtLegacyUnordered = QPartialOrdering::Unordered;
+#ifdef __cpp_lib_three_way_comparison
+    constexpr auto stdUnordered = std::partial_ordering::unordered;
+
+    QVERIFY(stdUnordered != 0);
+    QVERIFY(0 != stdUnordered);
+    QVERIFY(is_neq(stdUnordered));
+
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QCOMPARE_EQ(qtUnordered != 0, stdUnordered != 0);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QCOMPARE_EQ(0 != qtUnordered, 0 != stdUnordered);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QCOMPARE_EQ(is_neq(qtUnordered), is_neq(stdUnordered));
+
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QCOMPARE_EQ(qtLegacyUnordered != 0, stdUnordered != 0);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QCOMPARE_EQ(0 != qtLegacyUnordered, 0 != stdUnordered);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QCOMPARE_EQ(is_neq(qtLegacyUnordered), is_neq(stdUnordered));
+#endif
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QVERIFY(qtUnordered != 0);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QVERIFY(0 != qtUnordered);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QVERIFY(is_neq(qtUnordered));
+
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QVERIFY(qtLegacyUnordered != 0);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QVERIFY(0 != qtLegacyUnordered);
+    QEXPECT_FAIL("", "QTBUG-127759", Continue);
+    QVERIFY(is_neq(qtLegacyUnordered));
+}
+
 QTEST_MAIN(tst_QCompare)
 #include "tst_qcompare.moc"