diff --git a/fastly_compute/testing/__init__.py b/fastly_compute/testing/__init__.py
new file mode 100644
index 0000000..07fc269
--- /dev/null
+++ b/fastly_compute/testing/__init__.py
@@ -0,0 +1,14 @@
+"""Utilities for customers to use in their own tests"""
+
+# This module exists only to re-export public things.
+# ruff: noqa F401
+
+from .mock_http_server import MockHttpServer, make_test_request_handler
+from .viceroy import (
+    AutoViceroyTestBase,
+    ViceroyServer,
+    ViceroyReturn,
+    ViceroyException,
+    ViceroyTestBase,
+    on_viceroy,
+)
diff --git a/fastly_compute/test_server.py b/fastly_compute/testing/mock_http_server.py
similarity index 99%
rename from fastly_compute/test_server.py
rename to fastly_compute/testing/mock_http_server.py
index 89defb5..45793fb 100644
--- a/fastly_compute/test_server.py
+++ b/fastly_compute/testing/mock_http_server.py
@@ -126,7 +126,7 @@ def make_test_request_handler(
     )
 
 
-class LocalTestServer:
+class MockHttpServer:
     """Local HTTP server for backend testing.
 
     This server can be used to mock external backends during testing.
diff --git a/fastly_compute/testing.py b/fastly_compute/testing/viceroy.py
similarity index 98%
rename from fastly_compute/testing.py
rename to fastly_compute/testing/viceroy.py
index b6bbfad..faae714 100644
--- a/fastly_compute/testing.py
+++ b/fastly_compute/testing/viceroy.py
@@ -341,7 +341,7 @@ def ephemeral_wasm(cls):
 import bottle
 from bottle import Bottle, post
 
-from fastly_compute.testing import AutoViceroyTestBase, _ViceroyException, _ViceroyReturn
+from fastly_compute.testing import AutoViceroyTestBase, ViceroyException, ViceroyReturn
 AutoViceroyTestBase._is_on_viceroy = True
 
 import {cls.__module__}
@@ -355,7 +355,7 @@ def ephemeral_wasm(cls):
 @app.post("/<func_path>")
 def run_viceroy_chunk(func_path: str) -> bytes:
     """Run an `@on_viceroy`-decorated method from a test class in Viceroy, and
-    return its result, wrapped in a pickled _ViceroyReturn or _ViceroyException,
+    return its result, wrapped in a pickled ViceroyReturn or ViceroyException,
     over HTTP.
 
     :arg func_path: Fully qualified name of the function to run, typically like
@@ -374,9 +374,9 @@ def run_viceroy_chunk(func_path: str) -> bytes:
     try:
         return_value = method(class_, *shipped_args, **shipped_kwargs)
     except Exception as exc:
-        result = _ViceroyException(exc)
+        result = ViceroyException(exc)
     else:
-        result = _ViceroyReturn(return_value)
+        result = ViceroyReturn(return_value)
     return pickle.dumps(result)
 
 
@@ -419,7 +419,7 @@ def _as_class_method(method) -> classmethod:
     return classmethod(method) if isinstance(method, MethodType) else method
 
 
-class _ViceroyException:
+class ViceroyException:
     """An exception passed back from Viceroy-dwelling code"""
 
     def __init__(self, exception: Exception):
@@ -430,7 +430,7 @@ def raise_or_return_value(self):
         raise self.exception
 
 
-class _ViceroyReturn:
+class ViceroyReturn:
     """A function return value passed back from Viceroy-dwelling code"""
 
     def __init__(self, return_value: Any):
diff --git a/fastly_compute/tests/test_backend_requests.py b/fastly_compute/tests/test_backend_requests.py
index fc8ec95..e186dc5 100644
--- a/fastly_compute/tests/test_backend_requests.py
+++ b/fastly_compute/tests/test_backend_requests.py
@@ -6,8 +6,7 @@
 import pytest
 import requests
 
-from fastly_compute.test_server import LocalTestServer
-from fastly_compute.testing import ViceroyTestBase
+from fastly_compute.testing import MockHttpServer, ViceroyTestBase
 
 
 class BackendRequestsTestBase(ViceroyTestBase):
@@ -105,7 +104,7 @@ def setup_class(cls):
         }
 
         # Set up mock server
-        cls.test_server = LocalTestServer(
+        cls.test_server = MockHttpServer(
             host="127.0.0.1", port=0, responses=mock_responses
         )
         cls.test_server_url = cls.test_server.start()
@@ -225,7 +224,7 @@ def setup_class(cls):
             },
         }
 
-        cls.test_server = LocalTestServer(host="127.0.0.1", port=0, responses=responses)
+        cls.test_server = MockHttpServer(host="127.0.0.1", port=0, responses=responses)
         cls.test_server_url = cls.test_server.start()
 
         # Set up backends for viceroy
@@ -395,7 +394,7 @@ class TestRequestErrorHandling(BackendRequestsTestBase):
     def setup_class(cls):
         """Set up test backend."""
         # Create a local test server for backend testing
-        cls.test_server = LocalTestServer(host="127.0.0.1", port=0)
+        cls.test_server = MockHttpServer(host="127.0.0.1", port=0)
         base_url = cls.test_server.start()
 
         # Set up backends for viceroy (keep the full URL with scheme)
@@ -539,7 +538,7 @@ class TestBackendResolution(BackendRequestsTestBase):
     @classmethod
     def setup_class(cls):
         """Set up multiple backends for testing."""
-        cls.test_server1 = LocalTestServer(host="127.0.0.1", port=0)
+        cls.test_server1 = MockHttpServer(host="127.0.0.1", port=0)
         base_url1 = cls.test_server1.start()
 
         cls.set_up_backends(
@@ -597,7 +596,7 @@ class TestHTTPMethodHandling(BackendRequestsTestBase):
     @classmethod
     def setup_class(cls):
         """Set up test backend."""
-        cls.test_server = LocalTestServer(host="127.0.0.1", port=0)
+        cls.test_server = MockHttpServer(host="127.0.0.1", port=0)
         base_url = cls.test_server.start()
         cls.set_up_backends({"test-be": base_url})