tst_qquickmaterialstyle: add test for popup propagation to child item

As a sanity check to confirm that this works for a related follow-up
patch.

Change-Id: Ic62c19ba33bd24f0855a224d8120a9b4a324bc9b
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>
(cherry picked from commit 38f5e4ad4732c2f01df91ba4550e1ebb3320ad14)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 1dc8edde4370da415f4fe6e57893c6bbf78f2abe)
(cherry picked from commit f8422cbccd4576a08db0ac4ad068ec16831f9ce4)
(cherry picked from commit b155032acf0ec13fcd6ea24e098af5b82d21cc33)

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/auto/quickcontrols/qquickmaterialstyle/data/tst_material.qml b/tests/auto/quickcontrols/qquickmaterialstyle/data/tst_material.qml
index 69a2d95ab3..862aa15488 100644
--- a/tests/auto/quickcontrols/qquickmaterialstyle/data/tst_material.qml
+++ b/tests/auto/quickcontrols/qquickmaterialstyle/data/tst_material.qml
@@ -1325,4 +1325,33 @@ TestCase {
 
         tryCompare(busyIndicator.contentItem, "visible", true)
     }
+
+    Component {
+        id: labelInPopupComponent
+
+        Popup {
+            id: popupInstance
+
+            property alias label: label
+
+            Material.theme: Material.Dark
+
+            Label {
+                id: label
+                text: "Should have a dark theme"
+            }
+        }
+    }
+
+    function test_popupPropagatesToChildItem() {
+        let popup = createTemporaryObject(labelInPopupComponent, testCase)
+        verify(popup)
+
+        compare(popup.Material.theme, Material.Dark)
+        compare(popup.label.Material.theme, Material.Dark)
+
+        popup.Material.theme = Material.Light
+        compare(popup.Material.theme, Material.Light)
+        compare(popup.label.Material.theme, Material.Light)
+    }
 }