diff --git a/docker/development/files/requirements.lock b/docker/development/files/requirements.lock
index 102164142d1..bf419073064 100644
--- a/docker/development/files/requirements.lock
+++ b/docker/development/files/requirements.lock
@@ -36,7 +36,9 @@ cryptography==46.0.3
 distlib==0.4.0
     # via virtualenv
 doipclient==1.1.1
-    # via -r tools/UdsTool/requirements.txt
+    # via
+    #   -r test/pyTest/requirements.txt
+    #   -r tools/UdsTool/requirements.txt
 dulwich==0.24.10
     # via poetry
 exceptiongroup==1.2.2
diff --git a/test/pyTest/conftest.py b/test/pyTest/conftest.py
index d0afa5c5bab..044bbc24978 100644
--- a/test/pyTest/conftest.py
+++ b/test/pyTest/conftest.py
@@ -1,4 +1,5 @@
-import pytest, os
+import pytest
+import os
 from can.interfaces import socketcan
 import isotp
 from doipclient import DoIPClient
@@ -232,7 +233,6 @@ def pytest_generate_tests(metafunc):
             fixture_names += ",uds_transport"
 
         for name, target_info in TargetInfo.by_name.items():
-
             if not need_hw_tester and not need_uds_transport:
                 all_targets_fixture_args.append(name)
 
diff --git a/test/pyTest/helper/helper.py b/test/pyTest/helper/helper.py
deleted file mode 100644
index 0b55c4bef66..00000000000
--- a/test/pyTest/helper/helper.py
+++ /dev/null
@@ -1,18 +0,0 @@
-import subprocess
-import time
-import os
-
-
-def run_process(cmd):
-    session_name = f"RefAppTest{os.getpid()}"
-    subprocess.run(["tmux", "new-session", "-d", "-s", session_name])
-    subprocess.run(["tmux", "send-keys", "-t", session_name, cmd, "C-m"])
-    time.sleep(1)
-
-    result = subprocess.run(
-        ["tmux", "capture-pane", "-t", session_name, "-p"],
-        capture_output=True,
-        text=True,
-    )
-    subprocess.run(["tmux", "kill-session", "-t", session_name])
-    return result.stdout.strip().splitlines()[-4:-1]
diff --git a/test/pyTest/uds/helpers/helper_functions.py b/test/pyTest/uds/helpers/helper_functions.py
index 7af0666bf1f..3bd32a7c089 100644
--- a/test/pyTest/uds/helpers/helper_functions.py
+++ b/test/pyTest/uds/helpers/helper_functions.py
@@ -1,5 +1,10 @@
 import binascii
 import udsoncan
+import subprocess
+import time
+import select
+import os
+
 
 class ByteCodec(udsoncan.DidCodec):
     def encode(self, value: bytes) -> bytes:
@@ -8,7 +13,68 @@ def encode(self, value: bytes) -> bytes:
     def decode(self, data: bytes) -> bytes:
         return data
 
+
 def hexlify(value):
     response = binascii.hexlify(value).decode("ascii")
-    formatted_response = ' '.join(response[i:i+2] for i in range(0, len(response), 2))
-    return formatted_response
\ No newline at end of file
+    formatted_response = " ".join(
+        response[i : i + 2] for i in range(0, len(response), 2)
+    )
+    return formatted_response
+
+
+def run_process(cmd, output_contains, timeout=5):
+    """Run a shell command and wait until specific output appears.
+
+    The command is executed in ``/bin/bash`` using ``subprocess``. The function waits
+    until `` output_contains`` is matched in the process output and returns the captured
+    text up to and including the matched token, plus the remainder of that line
+    (if any).
+
+    Args:
+        cmd: Shell command to execute.
+        output_contains: Output text or pattern to wait for.
+        timeout: Maximum number of seconds to wait for `` output_contains``.
+
+    Returns:
+        Captured process output containing `` output_contains``.
+
+    Raises:
+        AssertionError: If the process times out or exits before producing
+            `` output_contains``.
+    """
+    proc = subprocess.Popen(
+        ["/bin/bash", "-c", cmd],
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+        text=False,
+        bufsize=0,
+    )
+
+    poller = select.poll()
+    poller.register(proc.stdout, select.POLLIN)
+
+    output = []
+    deadline = time.monotonic() + timeout
+    try:
+        while True:
+            remaining_ms = max(0, int((deadline - time.monotonic()) * 1000))
+            if remaining_ms < 0:
+                    raise subprocess.TimeoutExpired(cmd=cmd, timeout=timeout)
+            events = poller.poll(remaining_ms)
+            if not events:
+                if remaining_ms == 0:
+                    raise subprocess.TimeoutExpired(cmd=cmd, timeout=timeout)
+                continue                    
+            chunk = os.read(proc.stdout.fileno(), 4096).decode()
+            if not chunk:
+                if proc.poll() is not None:
+                    break
+            output.append(chunk)
+            combined = "".join(output)
+
+            if output_contains in combined:
+                return combined
+        raise AssertionError(f"Did not find {output_contains} within {timeout}s\n Output:\n{''.join(output)}")
+    finally:
+        proc.kill()
+        proc.wait()
diff --git a/test/pyTest/uds/test_udsToolRDBI.py b/test/pyTest/uds/test_udsToolRDBI.py
index e6520f86b3f..39fa968faf3 100644
--- a/test/pyTest/uds/test_udsToolRDBI.py
+++ b/test/pyTest/uds/test_udsToolRDBI.py
@@ -1,6 +1,5 @@
 import os
-import helper.helper as helper
-from target_info import TargetInfo
+from helpers.helper_functions import run_process
 
 
 def create_uds_tool_command(channel, did):
@@ -14,13 +13,11 @@ def test_rdbi(target_session, did="CF01"):
     command = create_uds_tool_command(
         target_session.target_info.socketcan["channel"], did
     )
-    print(command)
-    output = helper.run_process(command)
+    output = run_process(command, "PositiveResponse", timeout=5)
+    lines = output.strip().splitlines()
 
-    assert any(
-        "PositiveResponse" in line for line in output
-    ), "Missing PositiveResponse"
+    assert any("PositiveResponse" in line for line in lines), "Missing PositiveResponse"
     assert any(
         "62cf01010200022202160f0100006d2f0000010600008fe0000001" in line
-        for line in output
+        for line in lines
     ), "Incorrect expected output"