Go SHM API to read simple data with size from SHM name

kitty_tests/shm.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+# License: GPLv3 Copyright: 2023, Kovid Goyal <kovid at kovidgoyal.net>
+
+
+import os
+import subprocess
+
+from kitty.constants import kitten_exe
+from kitty.fast_data_types import shm_unlink
+from kitty.shm import SharedMemory
+
+from . import BaseTest
+
+
+class SHMTest(BaseTest):
+
+    def test_shm_with_kitten(self):
+        data = os.urandom(333)
+        with SharedMemory(size=363) as shm:
+            shm.write_data_with_size(data)
+            cp = subprocess.run([kitten_exe(), '__pytest__', 'shm', 'read', shm.name], stdout=subprocess.PIPE)
+            self.assertEqual(cp.returncode, 0)
+            self.assertEqual(cp.stdout, data)
+            self.assertRaises(FileNotFoundError, shm_unlink, shm.name)
+        cp = subprocess.run([kitten_exe(), '__pytest__', 'shm', 'write'], input=data, stdout=subprocess.PIPE)
+        self.assertEqual(cp.returncode, 0)
+        name = cp.stdout.decode().strip()
+        with SharedMemory(name=name, unlink_on_exit=True) as shm:
+            q = shm.read_data_with_size()
+            self.assertEqual(data, q)