tests: add a test for cython structured_sources

test cases/cython/4 structured sources/gen.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python3
+
+import argparse
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('out')
+    args = parser.parse_args()
+
+    with open(args.out, 'w') as f:
+        f.write('cpdef int generate(int in_)\n')
+
+
+if __name__ == '__main__':
+    main()

test cases/cython/4 structured sources/gen/gen.pyx

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+cpdef int generate(int in_):
+    return in_ + 1

test cases/cython/4 structured sources/lib.pyx

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+from gen import generated
+
+cpdef int foo(int in_):
+    return generated(in_)

test cases/cython/4 structured sources/meson.build

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+project('structured sources', 'cython')
+
+py_mod = import('python')
+py3 = py_mod.find_installation('python3')
+py3_dep = py3.dependency(required : false)
+if not py3_dep.found()
+  error('MESON_SKIP_TEST: Python library not found.')
+endif
+
+gen = custom_target(
+  'gen.pyd',
+  output : ['gen.pyd'],
+  command : ['gen.py', '@OUTPUT@'],
+)
+
+py3.extension_module(
+  'lib',
+  structured_sources(
+    'lib.pyx',
+    {'gen' : [gen, 'gen/gen.pyx', 'gen/__init__.pyd']},
+  ),
+  dependencies : py3_dep,
+)
+
+test(
+  'lib',
+  py3,
+  args : [files('test.py')],
+  env : ['PYTHONPATH=' + meson.current_build_dir()]
+)

test cases/cython/4 structured sources/test.py

@@ -0,0 +1,9 @@
+import lib
+
+
+def main() -> int:
+    return int(lib.generate(1)) == 2
+
+
+if __name__ == "__main__":
+    exit(main())