Extend and improve tst_customization

Add more test cases, and clarify the roles of the test styles.
- empty: no delegates at all
- incomplete: has all delegates, but with no bindings that access
  delegates and therefore trigger creation (tests that delegates must
  be created regardless)
- simple: has all delegates and creates bindings to simulate a full
  style
- override: overrides the simple style and tests that the default
  instances of overridden delegates are not created

There are still several non-popup controls that lack deferred
execution. These are marked with QEXPECT_FAIL() to make it easy
to track what's missing. This list still excludes all popups.

Task-number: QTBUG-50992
Change-Id: I70ce42592e7a320251edebfab3030ccc7c0eb978
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

1 files changed, 10 insertions, 2 deletions

diff --git a/tests/auto/customization/data/styles/incomplete/RangeSlider.qml b/tests/auto/customization/data/styles/incomplete/RangeSlider.qml
index 2a77cec6..1905d7ec 100644
--- a/tests/auto/customization/data/styles/incomplete/RangeSlider.qml
+++ b/tests/auto/customization/data/styles/incomplete/RangeSlider.qml
@@ -56,10 +56,18 @@ T.RangeSlider {
     objectName: "rangeslider-incomplete"
 
     first.handle: Item {
-        objectName: "rangeslider-first-handle-incomplete"
+        objectName: "rangeslider-first.handle-incomplete"
     }
 
     second.handle: Item {
-        objectName: "rangeslider-second-handle-incomplete"
+        objectName: "rangeslider-second.handle-incomplete"
+    }
+
+    contentItem: Item {
+        objectName: "rangeslider-contentItem-incomplete"
+    }
+
+    background: Item {
+        objectName: "rangeslider-background-incomplete"
     }
 }