diff --git a/packages/cli/tests/bindings-test/src/service_test.py b/packages/cli/tests/bindings-test/src/service_test.py
new file mode 100644
index 0000000..222c403
--- /dev/null
+++ b/packages/cli/tests/bindings-test/src/service_test.py
@@ -0,0 +1,170 @@
+async def test_identity_primitives(env):
+    svc = env.SERVICE_BINDING
+    assert await svc.identity("hello") == "hello"
+    assert await svc.identity(42) == 42
+    assert await svc.identity(3.14) - 3.14 < 0.001
+    assert await svc.identity(True) is True
+    assert await svc.identity(False) is False
+    assert await svc.identity(None) is None
+
+
+async def test_identity_dict(env):
+    data = {"key": "value", "number": 42, "flag": True}
+    result = await env.SERVICE_BINDING.identity(data)
+    assert result["key"] == "value"
+    assert result["number"] == 42
+    assert result["flag"] is True
+
+
+async def test_identity_list(env):
+    data = [1, "two", 3.0, True, None]
+    result = await env.SERVICE_BINDING.identity(data)
+    assert result == data
+
+
+async def test_identity_nested_dict(env):
+    data = {
+        "level1": {
+            "level2": {"value": "deep"},
+            "list": [1, 2, 3],
+        },
+        "top": "shallow",
+    }
+    result = await env.SERVICE_BINDING.identity(data)
+    assert result["top"] == "shallow"
+    assert result["level1"]["level2"]["value"] == "deep"
+    assert result["level1"]["list"] == [1, 2, 3]
+
+
+async def test_identity_list_of_dicts(env):
+    data = [{"name": "alice", "age": 30}, {"name": "bob", "age": 25}]
+    result = await env.SERVICE_BINDING.identity(data)
+    assert result[0]["name"] == "alice"
+    assert result[1]["age"] == 25
+
+
+async def test_identity_empty_collections(env):
+    svc = env.SERVICE_BINDING
+    assert await svc.identity({}) == {}
+    assert await svc.identity([]) == []
+    assert await svc.identity("") == ""
+
+
+async def test_rpc_multiple_args(env):
+    result = await env.SERVICE_BINDING.add(10, 32)
+    assert result == 42
+
+
+async def test_rpc_transform_dict(env):
+    result = await env.SERVICE_BINDING.transform_dict({"original": True})
+    assert result["original"] is True
+    assert result["added_by_service"] is True
+
+
+async def test_rpc_multi_args_mixed_types(env):
+    result = await env.SERVICE_BINDING.multi_args(
+        "test_name", 42, ["a", "b", "c"], {"meta_key": "meta_value"}
+    )
+    assert result["name"] == "test_name"
+    assert result["count"] == 42
+    assert result["item_count"] == 3
+    assert "meta_key" in result["meta_keys"]
+
+
+async def test_rpc_get_nested_return(env):
+    result = await env.SERVICE_BINDING.get_nested()
+    assert result["top"] == "shallow"
+    assert result["level1"]["level2"]["value"] == "deep"
+    assert result["level1"]["list"] == [1, 2, 3]
+
+
+async def test_rpc_default_values_all_provided(env):
+    result = await env.SERVICE_BINDING.with_defaults("req", "custom", 5)
+    assert result["required"] == "req"
+    assert result["optional"] == "custom"
+    assert result["count"] == 5
+
+
+async def test_rpc_default_values_partial(env):
+    result = await env.SERVICE_BINDING.with_defaults("req")
+    assert result["required"] == "req"
+    assert result["optional"] == "default_val"
+    assert result["count"] == 0
+
+
+async def test_unsupported_tuple_raises(env):
+    error_msg = None
+    try:
+        await env.SERVICE_BINDING.identity((1, 2, 3))
+    except TypeError as e:
+        error_msg = str(e)
+    assert error_msg is not None, "expected TypeError for tuple"
+    assert "cannot be sent over RPC" in error_msg, f"unexpected error: {error_msg}"
+
+
+async def test_unsupported_class_instance_raises(env):
+    error_msg = None
+    try:
+        class Custom:
+            def __init__(self):
+                self.x = 42
+        await env.SERVICE_BINDING.identity(Custom())
+    except Exception as e:
+        error_msg = str(e)
+    assert error_msg is not None, "expected error for custom class"
+    assert "DataCloneError" in error_msg or "could not be cloned" in error_msg, (
+        f"expected DataCloneError, got: {error_msg}"
+    )
+
+
+async def test_fetch_get(env):
+    resp = await env.SERVICE_BINDING.fetch("http://service/inspect")
+    data = await resp.json()
+    assert data["method"] == "GET", f"expected GET, got {data['method']}"
+
+
+async def test_fetch_post_body(env):
+    resp = await env.SERVICE_BINDING.fetch(
+        "http://service/inspect",
+        method="POST",
+        body="hello body",
+    )
+    data = await resp.json()
+    assert data["method"] == "POST", f"expected POST, got {data['method']}"
+    assert data["body"] == "hello body", f"expected 'hello body', got {data['body']!r}"
+
+
+async def test_fetch_post_json(env):
+    import json
+    payload = json.dumps({"key": "value"})
+    resp = await env.SERVICE_BINDING.fetch(
+        "http://service/inspect",
+        method="POST",
+        body=payload,
+        headers={"Content-Type": "application/json"},
+    )
+    data = await resp.json()
+    assert data["method"] == "POST"
+    assert data["content_type"] == "application/json"
+    assert json.loads(data["body"]) == {"key": "value"}
+
+
+SERVICE_TESTS = {
+    "identity_primitives": test_identity_primitives,
+    "identity_dict": test_identity_dict,
+    "identity_list": test_identity_list,
+    "identity_nested_dict": test_identity_nested_dict,
+    "identity_list_of_dicts": test_identity_list_of_dicts,
+    "identity_empty_collections": test_identity_empty_collections,
+    "rpc_multiple_args": test_rpc_multiple_args,
+    "rpc_transform_dict": test_rpc_transform_dict,
+    "rpc_multi_args_mixed_types": test_rpc_multi_args_mixed_types,
+    "rpc_get_nested_return": test_rpc_get_nested_return,
+    "rpc_default_values_all_provided": test_rpc_default_values_all_provided,
+    "rpc_default_values_partial": test_rpc_default_values_partial,
+    "unsupported_tuple_raises": test_unsupported_tuple_raises,
+    "unsupported_class_instance_raises": test_unsupported_class_instance_raises,
+    "fetch_get": test_fetch_get,
+    "fetch_post_body": test_fetch_post_body,
+    "fetch_post_json": test_fetch_post_json,
+}
diff --git a/packages/cli/tests/bindings-test/src/service_worker.py b/packages/cli/tests/bindings-test/src/service_worker.py
new file mode 100644
index 0000000..e070106
--- /dev/null
+++ b/packages/cli/tests/bindings-test/src/service_worker.py
@@ -0,0 +1,53 @@
+from workers import Response, WorkerEntrypoint
+
+
+class ServiceBinding(WorkerEntrypoint):
+    async def fetch(self, request):
+        from urllib.parse import urlparse
+        path = urlparse(request.url).path
+        if path == "/echo":
+            body = await request.text()
+            return Response(body)
+        if path == "/inspect":
+            body = await request.text()
+            return Response.json({
+                "method": request.method,
+                "url": request.url,
+                "body": body,
+                "content_type": request.headers.get("Content-Type") or "",
+            })
+        return Response("service b", status=200)
+
+    async def identity(self, value):
+        return value
+
+    async def add(self, a, b):
+        return a + b
+
+    async def transform_dict(self, data):
+        data["added_by_service"] = True
+        return data
+
+    async def get_nested(self):
+        return {
+            "level1": {
+                "level2": {"value": "deep"},
+                "list": [1, 2, 3],
+            },
+            "top": "shallow",
+        }
+
+    async def multi_args(self, name, count, items, meta):
+        return {
+            "name": name,
+            "count": count,
+            "item_count": len(list(items)),
+            "meta_keys": list(meta.keys()),
+        }
+
+    async def with_defaults(self, required, optional="default_val", count=0):
+        return {
+            "required": required,
+            "optional": optional,
+            "count": count,
+        }
diff --git a/packages/cli/tests/bindings-test/src/worker.py b/packages/cli/tests/bindings-test/src/worker.py
index 9c72fc7..3616c00 100644
--- a/packages/cli/tests/bindings-test/src/worker.py
+++ b/packages/cli/tests/bindings-test/src/worker.py
@@ -7,6 +7,10 @@
 )
 from kv_test import KV_TESTS
 from r2_test import R2_TESTS
+from service_test import SERVICE_TESTS
+from service_worker import (
+    ServiceBinding,  # noqa: F401 - side effect of registering the entrypoint
+)
 from workers import Response, WorkerEntrypoint
 
 ALL_TESTS = {
@@ -14,6 +18,7 @@
     "r2": R2_TESTS,
     "d1": D1_TESTS,
     "do": DO_TESTS,
+    "service": SERVICE_TESTS,
 }
 
 
diff --git a/packages/cli/tests/bindings-test/wrangler.jsonc b/packages/cli/tests/bindings-test/wrangler.jsonc
index 9cdc3ca..f501383 100644
--- a/packages/cli/tests/bindings-test/wrangler.jsonc
+++ b/packages/cli/tests/bindings-test/wrangler.jsonc
@@ -23,5 +23,12 @@
     },
     "migrations": [
         { "tag": "v1", "new_sqlite_classes": ["TestDurableObject"] }
+    ],
+    "services": [
+        {
+            "binding": "SERVICE_BINDING",
+            "service": "bindings-test",
+            "entrypoint": "ServiceBinding"
+        }
     ]
 }
diff --git a/packages/cli/tests/test_bindings.py b/packages/cli/tests/test_bindings.py
index bf49462..2862fdb 100644
--- a/packages/cli/tests/test_bindings.py
+++ b/packages/cli/tests/test_bindings.py
@@ -147,6 +147,29 @@ def binding_suite(suite: str, tests: list[str]) -> type:
     )
 
 
+TestService = binding_suite(
+    "service",
+    [
+        "identity_primitives",
+        "identity_dict",
+        "identity_list",
+        "identity_nested_dict",
+        "identity_list_of_dicts",
+        "identity_empty_collections",
+        "rpc_multiple_args",
+        "rpc_transform_dict",
+        "rpc_multi_args_mixed_types",
+        "rpc_get_nested_return",
+        "rpc_default_values_all_provided",
+        "rpc_default_values_partial",
+        "unsupported_tuple_raises",
+        "unsupported_class_instance_raises",
+        "fetch_get",
+        "fetch_post_body",
+        "fetch_post_json",
+    ],
+)
+
 TestKV = binding_suite(
     "kv",
     [