diff --git a/test/integ/test_houdini_adaptors.py b/test/integ/test_houdini_adaptors.py
index 604eb8f..82f2a77 100644
--- a/test/integ/test_houdini_adaptors.py
+++ b/test/integ/test_houdini_adaptors.py
@@ -6,6 +6,10 @@
 
 from .helpers.test_runners import run_command, run_houdini_adaptor_test
 from .helpers.image_comparison import assert_all_images_close
+import os
+import psutil
+
+from deadline.houdini_adaptor.HoudiniAdaptor import HoudiniAdaptor
 
 
 @pytest.mark.adaptor
@@ -91,3 +95,150 @@ def test_render_dependencies_adaptor(
         assert_all_images_close(
             script_location / "render_dependencies_test" / "expected_images", tmp_path
         )
+
+    def test_adaptor_open_close(
+        self, hython_location: Path, script_location: Path, tmp_path: Path
+    ) -> None:
+        """Test that the adaptor can successfully open and close the Houdini client."""
+        run_command(
+            [
+                str(hython_location),
+                str(script_location / "minimal_test" / "_test_hip.py"),
+                "--",
+                str(script_location),
+                str(tmp_path),
+                "adaptor",
+            ]
+        )
+
+        adaptor = HoudiniAdaptor(
+            {
+                "scene_file": f"{str(tmp_path)}/test.hip",
+                "render_node": "/out/mantra1",
+                "version": os.environ["HOUDINI_VERSION"],
+            }
+        )
+
+        adaptor.on_start()
+        assert adaptor._houdini_is_running
+
+        # Validate process is actually running using PID
+        assert adaptor._houdini_client
+        pid = adaptor._houdini_client.pid
+        assert psutil.pid_exists(pid)
+
+        adaptor.on_cleanup()
+        assert not adaptor._houdini_is_running
+        assert not psutil.pid_exists(pid)
+
+    def test_adaptor_cancel_closes_houdini(
+        self, hython_location: Path, script_location: Path, tmp_path: Path
+    ) -> None:
+        """Test that on_cancel closes the Houdini client."""
+        run_command(
+            [
+                str(hython_location),
+                str(script_location / "minimal_test" / "_test_hip.py"),
+                "--",
+                str(script_location),
+                str(tmp_path),
+                "adaptor",
+            ]
+        )
+
+        adaptor = HoudiniAdaptor(
+            {
+                "scene_file": f"{str(tmp_path)}/test.hip",
+                "render_node": "/out/mantra1",
+                "version": os.environ["HOUDINI_VERSION"],
+            }
+        )
+
+        adaptor.on_start()
+        assert adaptor._houdini_is_running
+
+        assert adaptor._houdini_client
+        pid = adaptor._houdini_client.pid
+        assert psutil.pid_exists(pid)
+
+        adaptor.on_cancel()
+        assert not adaptor._houdini_is_running
+        assert not psutil.pid_exists(pid)
+
+    def test_adaptor_daemon_open_close(
+        self, hython_location: Path, script_location: Path, tmp_path: Path
+    ) -> None:
+        """Test that the adaptor can open and close the Houdini client in daemon mode."""
+        import tempfile
+        import subprocess
+        import json
+        import time
+
+        run_command(
+            [
+                str(hython_location),
+                str(script_location / "minimal_test" / "_test_hip.py"),
+                "--",
+                str(script_location),
+                str(tmp_path),
+                "adaptor",
+            ]
+        )
+
+        with tempfile.TemporaryDirectory() as tmpdir:
+            connection_file = Path(tmpdir) / "connection.json"
+
+            # Start daemon backend
+            init_data = {
+                "scene_file": f"{str(tmp_path)}/test.hip",
+                "render_node": "/out/mantra1",
+                "version": os.environ["HOUDINI_VERSION"],
+            }
+
+            try:
+                start_process = subprocess.run(
+                    [
+                        "houdini-openjd",
+                        "daemon",
+                        "start",
+                        "--connection-file",
+                        str(connection_file),
+                        "--init-data",
+                        json.dumps(init_data),
+                    ]
+                )
+
+                assert start_process.returncode == 0
+
+                # Wait for connection file
+                timeout = time.time() + 10
+                while not connection_file.exists() and time.time() < timeout:
+                    time.sleep(0.1)
+                assert connection_file.exists()
+
+                # Connect and verify process is running
+                connection_data = json.loads(connection_file.read_text())
+                assert "socket" in connection_data, "Connection file should contain socket"
+
+            finally:
+                # Stop daemon
+                if connection_file.exists():
+                    stop_cmd = [
+                        "houdini-openjd",
+                        "daemon",
+                        "stop",
+                        "--connection-file",
+                        str(connection_file),
+                    ]
+
+                    stop_process = subprocess.run(
+                        stop_cmd,
+                        capture_output=True,
+                        text=True,
+                        timeout=30,
+                    )
+
+                    # Verify daemon stopped successfully
+                    assert (
+                        stop_process.returncode == 0
+                    ), f"Daemon stop failed: {stop_process.stderr}"