diff --git a/tests/test_scenario/__init__.py b/tests/test_scenario/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/test_scenario/fault_injector_client.py b/tests/test_scenario/fault_injector_client.py
new file mode 100644
index 0000000000..9cb35b24b6
--- /dev/null
+++ b/tests/test_scenario/fault_injector_client.py
@@ -0,0 +1,105 @@
+import json
+import urllib.request
+from typing import Dict, Any, Optional, Union
+from enum import Enum
+
+
+class ActionType(str, Enum):
+    DMC_RESTART = "dmc_restart"
+    FAILOVER = "failover"
+    RESHARD = "reshard"
+    SEQUENCE_OF_ACTIONS = "sequence_of_actions"
+    NETWORK_FAILURE = "network_failure"
+    EXECUTE_RLUTIL_COMMAND = "execute_rlutil_command"
+    EXECUTE_RLADMIN_COMMAND = "execute_rladmin_command"
+
+
+class RestartDmcParams:
+    def __init__(self, bdb_id: str):
+        self.bdb_id = bdb_id
+
+    def to_dict(self) -> Dict[str, str]:
+        return {"bdb_id": self.bdb_id}
+
+
+class ActionRequest:
+    def __init__(
+        self,
+        action_type: ActionType,
+        parameters: Union[Dict[str, Any], RestartDmcParams],
+    ):
+        self.type = action_type
+        self.parameters = parameters
+
+    def to_dict(self) -> Dict[str, Any]:
+        return {
+            "type": self.type.value,  # Use the string value of the enum
+            "parameters": self.parameters.to_dict()
+            if isinstance(self.parameters, RestartDmcParams)
+            else self.parameters,
+        }
+
+
+class FaultInjectorClient:
+    def __init__(self, base_url: str):
+        self.base_url = base_url.rstrip("/")
+
+    def _make_request(
+        self, method: str, path: str, data: Optional[Dict] = None
+    ) -> Dict[str, Any]:
+        url = f"{self.base_url}{path}"
+        headers = {"Content-Type": "application/json"} if data else {}
+
+        request_data = json.dumps(data).encode("utf-8") if data else None
+
+        request = urllib.request.Request(
+            url, method=method, data=request_data, headers=headers
+        )
+
+        try:
+            with urllib.request.urlopen(request) as response:
+                return json.loads(response.read().decode("utf-8"))
+        except urllib.error.HTTPError as e:
+            if e.code == 422:
+                error_body = json.loads(e.read().decode("utf-8"))
+                raise ValueError(f"Validation Error: {error_body}")
+            raise
+
+    def list_actions(self) -> Dict[str, Any]:
+        """List all available actions"""
+        return self._make_request("GET", "/action")
+
+    def trigger_action(self, action_request: ActionRequest) -> Dict[str, Any]:
+        """Trigger a new action"""
+        request_data = action_request.to_dict()
+        return self._make_request("POST", "/action", request_data)
+
+    def get_action_status(self, action_id: str) -> Dict[str, Any]:
+        """Get the status of a specific action"""
+        return self._make_request("GET", f"/action/{action_id}")
+
+    def execute_rladmin_command(
+        self, command: str, bdb_id: str = None
+    ) -> Dict[str, Any]:
+        """Execute rladmin command directly as string"""
+        url = f"{self.base_url}/rladmin"
+
+        # The fault injector expects the raw command string
+        command_string = f"rladmin {command}"
+        if bdb_id:
+            command_string = f"rladmin -b {bdb_id} {command}"
+
+        headers = {"Content-Type": "text/plain"}
+
+        request = urllib.request.Request(
+            url, method="POST", data=command_string.encode("utf-8"), headers=headers
+        )
+
+        try:
+            with urllib.request.urlopen(request) as response:
+                return json.loads(response.read().decode("utf-8"))
+        except urllib.error.HTTPError as e:
+            if e.code == 422:
+                error_body = json.loads(e.read().decode("utf-8"))
+                raise ValueError(f"Validation Error: {error_body}")
+            raise