basic qt widgets support

tests/conftest.py

@@ -8,6 +8,7 @@ before calling pytest. If you prefer to run pytest directly, set these:
   GAMMARAY_LIB_DIR — directory containing GammaRay shared libraries
   QML_RUNNER      — path to the QML runtime executable
   TEST_QML        — path to the test QML application
+  WIDGET_TEST_APP — path to the widget test application (C++ QWidget binary)
   BRIDGE_EXE      — path to the bridge executable
   BRIDGE_RUN_SCRIPT — path to bridge/run.sh
 """
@@ -41,6 +42,14 @@ TEST_QML = Path(os.environ.get(
     "TEST_QML",
     str(PROJECT_ROOT / "tests" / "testapp" / "main.qml"),
 ))
+WIDGET_TEST_APP_BIN = Path(os.environ.get(
+    "WIDGET_TEST_APP_BIN",
+    str(PROJECT_ROOT / "tests" / "testapp" / "widget_test_app"),
+))
+WIDGET_TEST_APP_SRC = Path(os.environ.get(
+    "WIDGET_TEST_APP_SRC",
+    str(PROJECT_ROOT / "tests" / "testapp" / "widget_test_app.cpp"),
+))
 BRIDGE_EXE = Path(os.environ.get(
     "BRIDGE_EXE",
     str(PROJECT_ROOT / "bridge" / "build" / "qml-sg-mcp-bridge"),
@@ -51,6 +60,43 @@ BRIDGE_RUN_SCRIPT = Path(os.environ.get(
 ))
 
 
+def _compile_widget_app() -> Path:
+    """Compile the widget test app if needed. Returns the binary path."""
+    if WIDGET_TEST_APP_BIN.exists():
+        return WIDGET_TEST_APP_BIN
+    if not WIDGET_TEST_APP_SRC.exists():
+        pytest.skip(f"Widget test app source not found at {WIDGET_TEST_APP_SRC}")
+    # Find Qt6 via pkg-config
+    try:
+        import subprocess as sp
+        cflags = sp.check_output(
+            ["pkg-config", "--cflags", "Qt6Core", "Qt6Gui", "Qt6Widgets"],
+            text=True
+        ).strip()
+        libs = sp.check_output(
+            ["pkg-config", "--libs", "Qt6Core", "Qt6Gui", "Qt6Widgets"],
+            text=True
+        ).strip()
+    except (subprocess.CalledProcessError, FileNotFoundError):
+        # Fallback: try qmake6
+        try:
+            qmake = sp.check_output(["which", "qmake6"], text=True).strip()
+            prefix = sp.check_output([qmake, "-query", "QT_INSTALL_PREFIX"], text=True).strip()
+            cflags = f"-I{prefix}/include -I{prefix}/include/QtCore -I{prefix}/include/QtGui -I{prefix}/include/QtWidgets"
+            libs = f"-L{prefix}/lib -lQt6Core -lQt6Gui -lQt6Widgets"
+        except (subprocess.CalledProcessError, FileNotFoundError):
+            pytest.skip("Cannot find Qt6 build flags (need pkg-config or qmake6)")
+
+    subprocess.run(
+        ["g++", "-std=c++17", "-fPIC",
+         str(WIDGET_TEST_APP_SRC),
+         "-o", str(WIDGET_TEST_APP_BIN),
+         *cflags.split(), *libs.split()],
+        check=True, timeout=30,
+    )
+    return WIDGET_TEST_APP_BIN
+
+
 def pytest_addoption(parser):
     parser.addoption(
         "--no-probe",
@@ -64,6 +110,12 @@ def pytest_addoption(parser):
         default=15,
         help="Seconds to wait for probe to be ready",
     )
+    parser.addoption(
+        "--widget-app",
+        action="store_true",
+        default=False,
+        help="Use widget test app instead of QML app for probe target",
+    )
 
 
 def pytest_collection_modifyitems(config, items):
@@ -103,12 +155,24 @@ def _probe_accepting_connections(timeout: int = 20) -> bool:
 
 @pytest.fixture(scope="session")
 def probe_process(request) -> subprocess.Popen | None:
-    """Start a GammaRay probe process (session-scoped, one per entire test run)."""
+    """Start a GammaRay probe process (session-scoped, one per entire test run).
+
+    Uses either the QML test app or the widget test app depending on --widget-app.
+    """
     if request.config.getoption("--no-probe"):
         return None
 
     if not GAMMARAY_BIN.exists():
         pytest.skip(f"GammaRay probe binary not found at {GAMMARAY_BIN}")
+
+    if request.config.getoption("--widget-app"):
+        return _start_widget_probe(request)
+    else:
+        return _start_qml_probe(request)
+
+
+def _start_qml_probe(request) -> subprocess.Popen:
+    """Start probe with QML test app."""
     if not TEST_QML.exists():
         pytest.skip(f"Test QML file not found at {TEST_QML}")
     if not QML_RUNNER.exists():
@@ -145,14 +209,72 @@ def probe_process(request) -> subprocess.Popen | None:
 
     timeout = request.config.getoption("--probe-timeout")
     if not _probe_accepting_connections(timeout):
-        # Fallback: direct spawn
         proc = subprocess.Popen(
             [str(GAMMARAY_BIN), "--inject-only", "--listen", "tcp://127.0.0.1:11732",
              "--injector", "preload", str(QML_RUNNER), str(TEST_QML)],
             env=env, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
         )
         if not _probe_accepting_connections(timeout):
-            pytest.fail(f"Probe did not become ready within {timeout}s")
+            pytest.fail(f"QML probe did not become ready within {timeout}s")
+    else:
+        proc = subprocess.Popen(["true"])
+
+    def cleanup():
+        subprocess.run(
+            ["systemctl", "--user", "stop", "gammaray-probe-test.service"],
+            capture_output=True, timeout=5,
+        )
+        subprocess.run(
+            ["systemctl", "--user", "reset-failed", "gammaray-probe-test.service"],
+            capture_output=True, timeout=5,
+        )
+
+    request.addfinalizer(cleanup)
+    return proc
+
+
+def _start_widget_probe(request) -> subprocess.Popen:
+    """Start probe with widget test app."""
+    widget_bin = _compile_widget_app()
+
+    env = os.environ.copy()
+    env["QT_QPA_PLATFORM"] = "offscreen"
+    env["LD_LIBRARY_PATH"] = GAMMARAY_LIB_DIR
+
+    subprocess.run(
+        ["systemctl", "--user", "stop", "gammaray-probe-test.service"],
+        capture_output=True, timeout=5,
+    )
+    subprocess.run(
+        ["systemctl", "--user", "reset-failed", "gammaray-probe-test.service"],
+        capture_output=True, timeout=5,
+    )
+
+    result = subprocess.run(
+        [
+            "systemd-run", "--user", "--no-block",
+            "--unit=gammaray-probe-test",
+            "--same-dir",
+            "--working-directory", str(widget_bin.parent),
+            "-E", f"QT_QPA_PLATFORM={env['QT_QPA_PLATFORM']}",
+            "-E", f"LD_LIBRARY_PATH={env['LD_LIBRARY_PATH']}",
+            str(GAMMARAY_BIN),
+            "--inject-only", "--listen", "tcp://127.0.0.1:11732",
+            "--injector", "preload",
+            str(widget_bin),
+        ],
+        capture_output=True, text=True, timeout=10,
+    )
+
+    timeout = request.config.getoption("--probe-timeout")
+    if not _probe_accepting_connections(timeout):
+        proc = subprocess.Popen(
+            [str(GAMMARAY_BIN), "--inject-only", "--listen", "tcp://127.0.0.1:11732",
+             "--injector", "preload", str(widget_bin)],
+            env=env, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,
+        )
+        if not _probe_accepting_connections(timeout):
+            pytest.fail(f"Widget probe did not become ready within {timeout}s")
     else:
         proc = subprocess.Popen(["true"])