Add basic Qt Quick Test example

.github/workflows/markdownlint.yml

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+name: Markdown Lint
+
+on:
+  push:
+    paths:
+      - '**/*.md'
+  pull_request:
+    paths:
+      - '**/*.md'
+
+jobs:
+  markdownlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Lint Markdown
+        uses: DavidAnson/markdownlint-cli2-action@v13
+        with:
+          globs: '**/*.md'

README.md

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+# Qt Quick Testing Tutorial
+
+This repository demonstrates a minimal Qt Quick Test setup using Qt 6 and CMake.
+
+The example project resides in `quicktest_example/`. Follow the instructions in
+its README to build and run the tests.

quicktest_example/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+project(QtQuickTestExample LANGUAGES CXX)
+
+find_package(Qt6 REQUIRED COMPONENTS QuickTest)
+
+# Enable C++17 for this example
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+add_executable(tst_example
+    main.cpp
+)
+
+target_link_libraries(tst_example PRIVATE Qt6::QuickTest)
+
+add_test(NAME tst_example COMMAND tst_example)
+

quicktest_example/README.md

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+# Qt Quick Test Example
+
+This directory contains a minimal example showing how to set up a Qt Quick Test
+project using CMake with Qt 6.
+
+## Building
+
+```bash
+mkdir build
+cd build
+cmake .. -DCMAKE_PREFIX_PATH=/path/to/Qt6
+cmake --build .
+ctest
+```
+
+Adjust `CMAKE_PREFIX_PATH` so that CMake can find your Qt 6 installation.
+
+## Files
+
+- `CMakeLists.txt` – CMake configuration for the test project.
+- `main.cpp` – Entry point that launches the QML tests.
+- `tst_example.qml` – A simple test case demonstrating Qt Quick Test usage.

quicktest_example/main.cpp

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+#include <QtQuickTest/quicktest.h>
+
+QUICK_TEST_MAIN(example)

quicktest_example/tst_example.qml

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+import QtQuick
+import QtTest
+
+TestCase {
+    name: "Example"
+
+    function test_addition() {
+        compare(1 + 1, 2)
+    }
+}