fix: fix import on windows

sip/PyQt6Ads.sip

@@ -1,6 +1,24 @@
 %Module(name=PyQt6Ads, call_super_init=True, keyword_arguments="Optional", use_limited_api=True)
 %HideNamespace(name=ads)
 
+%ModuleCode
+#ifdef _WIN32
+// Run at module initialization time
+struct PyQt6Importer {
+    PyQt6Importer() {
+        PyObject* pyqt6_module = PyImport_ImportModule("PyQt6");
+        if (!pyqt6_module) {
+            PyErr_SetString(PyExc_ImportError, "Failed to import PyQt6");
+            return;
+        }
+        Py_DECREF(pyqt6_module);
+    }
+};
+static PyQt6Importer _pyqt6_importer;  // Runs at module init
+#endif
+%End
+
+
 %Import QtCore/QtCoremod.sip
 %DefaultSupertype PyQt6.sip.simplewrapper
 

tests/test_examples.py

@@ -2,6 +2,7 @@
 from pathlib import Path
 from unittest.mock import patch
 
+import PyQt6Ads  # noqa
 import pytest
 from PyQt6.QtWidgets import QApplication