tests: add a test for accessing the C API through ctypes

For some API it might be easier to test things through Python and
I had this lying around so why not.

1 files changed, 54 insertions, 0 deletions

diff --git a/tests/test_pycapi.py b/tests/test_pycapi.py
new file mode 100644
index 00000000..969b78e5
--- /dev/null
+++ b/tests/test_pycapi.py
@@ -0,0 +1,54 @@
+from __future__ import absolute_import
+
+import sys
+import unittest
+import ctypes
+from ctypes import c_void_p, py_object, c_char_p
+
+import gi
+from gi.repository import Gio
+
+
+def get_capi():
+
+    if not hasattr(ctypes, "pythonapi"):
+        return
+
+    class CAPI(ctypes.Structure):
+        _fields_ = [
+            ("", c_void_p),
+            ("", c_void_p),
+            ("", c_void_p),
+            ("newgobj", ctypes.PYFUNCTYPE(py_object, c_void_p)),
+        ]
+
+    api_obj = gi._gobject._PyGObject_API
+    if sys.version_info[0] == 2:
+        func_type = ctypes.PYFUNCTYPE(c_void_p, py_object)
+        PyCObject_AsVoidPtr = func_type(
+            ('PyCObject_AsVoidPtr', ctypes.pythonapi))
+        ptr = PyCObject_AsVoidPtr(api_obj)
+    else:
+        func_type = ctypes.PYFUNCTYPE(c_void_p, py_object, c_char_p)
+        PyCapsule_GetPointer = func_type(
+            ('PyCapsule_GetPointer', ctypes.pythonapi))
+        ptr = PyCapsule_GetPointer(api_obj, b"gobject._PyGObject_API")
+
+    ptr = ctypes.cast(ptr, ctypes.POINTER(CAPI))
+    return ptr.contents
+
+
+API = get_capi()
+
+
+@unittest.skipUnless(API, "no pythonapi support")
+class TestPythonCAPI(unittest.TestCase):
+
+    def test_newgobj(self):
+        w = Gio.FileInfo()
+        # XXX: ugh :/
+        ptr = int(repr(w).split()[-1].split(")")[0], 16)
+
+        capi = get_capi()
+        new_w = capi.newgobj(ptr)
+        assert w == new_w