Fix ExtendedRgb and Rgb encoding comparisons

ExtendedRgb should be treated as Rgb as it can be an automatic upgrade.

Pick-to: 5.15
Change-Id: I2942a1067ed5cacb2f60f303f467887cb44c36dd
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/auto/gui/painting/qcolor/tst_qcolor.cpp b/tests/auto/gui/painting/qcolor/tst_qcolor.cpp
index f8502c1e2f..5bbf60ea79 100644
--- a/tests/auto/gui/painting/qcolor/tst_qcolor.cpp
+++ b/tests/auto/gui/painting/qcolor/tst_qcolor.cpp
@@ -106,6 +106,8 @@ private slots:
 
     void achromaticHslHue();
 
+    void equality();
+
     void premultiply();
     void unpremultiply_sse4();
     void qrgba64();
@@ -1682,6 +1684,24 @@ void tst_QColor::achromaticHslHue()
     QCOMPARE(hsl.hslHue(), -1);
 }
 
+void tst_QColor::equality()
+{
+    QColor red = Qt::red;
+    QColor black = Qt::black;
+
+    QCOMPARE(red, red);
+    QCOMPARE(black, black);
+    QVERIFY(red != black);
+
+    // Encodings must match
+    QVERIFY(red != red.toHsv());
+    QVERIFY(black.toHsl() != black);
+
+    // Except for ExtendedRgb and Rgb, as it can be an automatic upgrade.
+    QCOMPARE(red, red.toExtendedRgb());
+    QCOMPARE(black.toExtendedRgb(), black);
+}
+
 void tst_QColor::premultiply()
 {
     // Tests that qPremultiply(qUnpremultiply(x)) returns x.