gh-96853: Restore test coverage for Py_Initialize(Ex) (GH-98212)

* As most of `test_embed` now uses `Py_InitializeFromConfig`, add
  a specific test case to cover `Py_Initialize` (and `Py_InitializeEx`)
* Rename `_testembed` init helper to clarify the API used
* Add a `PyConfig_Clear` call in `Py_InitializeEx` to make
  the code more obviously correct (it already didn't leak as
  none of the dynamically allocated config fields were being
  populated, but it's clearer if the wrappers follow the
  documented API usage guidelines)

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/test/test_embed.py b/Lib/test/test_embed.py
index f622d44..930f763 100644
--- a/Lib/test/test_embed.py
+++ b/Lib/test/test_embed.py
@@ -340,6 +340,12 @@ class EmbeddingTests(EmbeddingTestsMixin, unittest.TestCase):
         out, err = self.run_embedded_interpreter("test_repeated_init_exec", code)
         self.assertEqual(out, 'Tests passed\n' * INIT_LOOPS)
 
+    def test_simple_initialization_api(self):
+        # _testembed now uses Py_InitializeFromConfig by default
+        # This case specifically checks Py_Initialize(Ex) still works
+        out, err = self.run_embedded_interpreter("test_repeated_simple_init")
+        self.assertEqual(out, 'Finalized\n' * INIT_LOOPS)
+
     def test_quickened_static_code_gets_unquickened_at_Py_FINALIZE(self):
         # https://github.com/python/cpython/issues/92031