TST: use C instead of Cython for editable support tests

Cython does not support yet free-threading Python.

tests/packages/complex/extension.c

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: 2024 The meson-python developers
+//
+// SPDX-License-Identifier: MIT
+
+#include <Python.h>
+
+static PyObject* answer(PyObject* self) {
+ return PyLong_FromLong(42);
+}
+
+static PyMethodDef methods[] = {
+ {"answer", (PyCFunction) answer, METH_NOARGS, NULL},
+ {NULL, NULL, 0, NULL},
+};
+
+static struct PyModuleDef module = {
+ PyModuleDef_HEAD_INIT,
+ "extension",
+ NULL,
+ -1,
+ methods,
+};
+
+PyMODINIT_FUNC PyInit_extension(void) {
+ return PyModule_Create(&module);
+}

tests/packages/complex/meson.build

@@ -33,6 +33,13 @@ install_subdir(
  exclude_files: ['more/meson.build', 'more/baz.pyx'],
 )
 
+py.extension_module(
+ 'extension',
+ 'extension.c',
+ install: true,
+ subdir: 'complex',
+)
+
 py.extension_module(
  'test',
  'test.pyx',

tests/test_editable.py

@@ -104,9 +104,9 @@ def test_mesonpy_meta_finder(package_complex, tmp_path):
  import complex
  assert complex.__spec__.origin == os.fspath(package_complex / 'complex/__init__.py')
  assert complex.__file__ == os.fspath(package_complex / 'complex/__init__.py')
- import complex.test
- assert complex.test.__spec__.origin == os.fspath(tmp_path / f'test{EXT_SUFFIX}')
- assert complex.test.answer() == 42
+ import complex.extension
+ assert complex.extension.__spec__.origin == os.fspath(tmp_path / f'extension{EXT_SUFFIX}')
+ assert complex.extension.answer() == 42
  import complex.namespace.foo
  assert complex.namespace.foo.__spec__.origin == os.fspath(package_complex / 'complex/namespace/foo.py')
  assert complex.namespace.foo.foo() == 'foo'
@@ -223,6 +223,7 @@ def test_editable_pkgutils_walk_packages(package_complex, tmp_path):
  packages = {m.name for m in pkgutil.walk_packages(complex.__path__, complex.__name__ + '.')}
  assert packages == {
  'complex.bar',
+ 'complex.extension',
  'complex.more',
  'complex.more.baz',
  'complex.more.move',