C++ testing: gate under the experimental feature

.github/workflows/ci.yaml

@@ -241,7 +241,7 @@ jobs:
               with:
                   cmakeListsOrSettingsJson: CMakeListsTxtAdvanced
                   cmakeListsTxtPath: CMakeLists.txt
-                  cmakeAppendedArgs: "-DSLINT_BUILD_TESTING=ON -DSLINT_BUILD_EXAMPLES=ON -DCMAKE_BUILD_TYPE=Debug -DSLINT_FEATURE_RENDERER_SKIA=ON -DSLINT_FEATURE_BACKEND_QT=ON"
+                  cmakeAppendedArgs: "-DSLINT_BUILD_TESTING=ON -DSLINT_BUILD_EXAMPLES=ON -DCMAKE_BUILD_TYPE=Debug -DSLINT_FEATURE_RENDERER_SKIA=ON -DSLINT_FEATURE_BACKEND_QT=ON -DSLINT_FEATURE_EXPERIMENTAL=ON -DSLINT_FEATURE_TESTING=ON"
                   buildDirectory: ${{ runner.workspace }}/cppbuild
                   buildWithCMakeArgs: "--config Debug"
             - name: ctest

CHANGELOG.md

@@ -2,7 +2,6 @@
 
 # Changelog
 All notable changes to this project are documented in this file.
-
 ## [1.6.0] - Unreleased
 
 ## General

api/cpp/include/slint-testing.h

@@ -7,6 +7,7 @@
 #include <string_view>
 
 #ifdef SLINT_FEATURE_TESTING
+#    ifdef SLINT_FEATURE_EXPERIMENTAL
 
 namespace slint::testing {
 /// Init the testing backend.
@@ -173,4 +174,5 @@ public:
 
 }
 
+#    endif // SLINT_FEATURE_EXPERIMENTAL
 #endif // SLINT_FEATURE_TESTING

examples/todo/cpp/CMakeLists.txt

@@ -16,7 +16,7 @@ add_executable(todo main.cpp)
 target_link_libraries(todo PRIVATE todo_lib)
 
 
-if(SLINT_BUILD_TESTING AND SLINT_FEATURE_TESTING)
+if(SLINT_BUILD_TESTING AND SLINT_FEATURE_TESTING AND SLINT_FEATURE_EXPERIMENAL)
     add_executable(test_todo_basic tests/test_todo_basic.cpp)
     target_link_libraries(test_todo_basic PRIVATE Catch2::Catch2 todo_lib)
     add_test(NAME test_todo_basic COMMAND test_todo_basic)

tests/driver/cpp/Cargo.toml

@@ -18,7 +18,7 @@ path = "main.rs"
 name = "test-driver-cpp"
 
 [dependencies]
-slint-cpp = { workspace = true, features = ["testing", "std"] }
+slint-cpp = { workspace = true, features = ["testing", "std", "experimental"] }
 
 [dev-dependencies]
 i-slint-compiler = { workspace = true, features = ["default", "cpp", "display-diagnostics"] }