diff --git a/src/rpcclient/rpcclient/client.py b/src/rpcclient/rpcclient/client.py
index 61643a67..df5e7c4e 100644
--- a/src/rpcclient/rpcclient/client.py
+++ b/src/rpcclient/rpcclient/client.py
@@ -263,6 +263,10 @@ def environ(self) -> typing.List[str]:
             i += 1
         return result
 
+    @property
+    def pid(self):
+        return int(self.symbols.getpid())
+
     @contextlib.contextmanager
     def safe_calloc(self, size: int):
         with self.safe_malloc(size) as x:
diff --git a/src/rpcclient/tests/test_allocation_cleanup.py b/src/rpcclient/tests/test_allocation_cleanup.py
new file mode 100644
index 00000000..63a7abca
--- /dev/null
+++ b/src/rpcclient/tests/test_allocation_cleanup.py
@@ -0,0 +1,43 @@
+import gc
+
+
+def test_allocate_file_fd_context_manager(client, tmp_path):
+    # make sure when the test starts, all previous Allocated references are freed
+    gc.collect()
+    fds_count = len(client.processes.get_fds(client.pid))
+    with client.fs.open(tmp_path / 'test', 'w'):
+        assert fds_count + 1 == len(client.processes.get_fds(client.pid))
+    assert fds_count == len(client.processes.get_fds(client.pid))
+
+
+def test_allocate_file_fd_gc(client, tmp_path):
+    # make sure when the test starts, all previous Allocated references are freed
+    gc.collect()
+    fds_count = len(client.processes.get_fds(client.pid))
+
+    # create a new fd with zero references, so it should be free immediately
+    client.fs.open(tmp_path / 'test', 'w')
+
+    # make sure python's GC had a chance to free the newly created fd
+    gc.collect()
+    assert fds_count == len(client.processes.get_fds(client.pid))
+
+
+def test_allocate_file_fd_explicit_del(client, tmp_path):
+    # make sure when the test starts, all previous Allocated references are freed
+    gc.collect()
+    fds_count = len(client.processes.get_fds(client.pid))
+    fd = client.fs.open(tmp_path / 'test', 'w')
+    assert fds_count + 1 == len(client.processes.get_fds(client.pid))
+    del fd
+    assert fds_count == len(client.processes.get_fds(client.pid))
+
+
+def test_allocate_file_fd_explicit_deallocate(client, tmp_path):
+    # make sure when the test starts, all previous Allocated references are freed
+    gc.collect()
+    fds_count = len(client.processes.get_fds(client.pid))
+    fd = client.fs.open(tmp_path / 'test', 'w')
+    assert fds_count + 1 == len(client.processes.get_fds(client.pid))
+    fd.deallocate()
+    assert fds_count >= len(client.processes.get_fds(client.pid))
diff --git a/src/rpcclient/tests/test_core_foundation_types.py b/src/rpcclient/tests/test_core_foundation_types.py
new file mode 100644
index 00000000..3dbc835f
--- /dev/null
+++ b/src/rpcclient/tests/test_core_foundation_types.py
@@ -0,0 +1,12 @@
+import pytest
+
+
+@pytest.mark.parametrize('data', ['string',
+                                  b'bytes',
+                                  123,
+                                  0.1,
+                                  [0, 1, 'abc'],
+                                  {'key': 'value'},
+                                  [{'key': 'value'}, [1, 2]]])
+def test_serialization(client, data):
+    assert client.cf(data).py == data