diff --git a/.chronus/changes/specs-multiServiceSimple-2025-11-2-16-19-14.md b/.chronus/changes/specs-multiServiceSimple-2025-11-2-16-19-14.md
new file mode 100644
index 0000000000..87200ec1d6
--- /dev/null
+++ b/.chronus/changes/specs-multiServiceSimple-2025-11-2-16-19-14.md
@@ -0,0 +1,7 @@
+---
+changeKind: feature
+packages:
+  - "@azure-tools/azure-http-specs"
+---
+
+Add data plane test for combined multi service.
diff --git a/packages/azure-http-specs/spec-summary.md b/packages/azure-http-specs/spec-summary.md
index aeaaf8e3d9..a5011b5a0d 100644
--- a/packages/azure-http-specs/spec-summary.md
+++ b/packages/azure-http-specs/spec-summary.md
@@ -4216,3 +4216,23 @@ With the above two calls, we test the following configurations from this service
 - A client generated from the second service spec can call the second deployment of a service with api version v2 with the updated changes
 
 Tests that we can grow up an operation from accepting one required parameter to accepting a required parameter and an optional parameter.
+
+### Service_MultiService_ServiceA_Foo_test
+
+- Endpoint: `get /service/multi-service/service-a/foo/test`
+
+  Test that a client can expose operations from multiple services. This operaton should be called like this: `client.foo.test(...)`.
+
+  Expected path: /service/multi-service/service-a/foo/test
+  Expected query parameter: api-version=av2
+  Expected 204 response.
+
+### Service_MultiService_ServiceB_Bar_test
+
+- Endpoint: `get /service/multi-service/service-b/bar/test`
+
+  Test that a client can expose operations from multiple services. This operaton should be called like this: `client.bar.test(...)`.
+
+  Expected path: /service/multi-service/service-b/bar/test
+  Expected query parameter: api-version=bv2
+  Expected 204 response.
diff --git a/packages/azure-http-specs/specs/service/multi-service/client.tsp b/packages/azure-http-specs/specs/service/multi-service/client.tsp
new file mode 100644
index 0000000000..53215701eb
--- /dev/null
+++ b/packages/azure-http-specs/specs/service/multi-service/client.tsp
@@ -0,0 +1,14 @@
+import "./main.tsp";
+import "@azure-tools/typespec-client-generator-core";
+import "@typespec/spector";
+import "@typespec/http";
+import "@typespec/versioning";
+
+using Azure.ClientGenerator.Core;
+using Spector;
+using Versioning;
+
+@client({
+  service: [Service.MultiService.ServiceA, Service.MultiService.ServiceB],
+})
+namespace Service.MultiService.Combined;
diff --git a/packages/azure-http-specs/specs/service/multi-service/main.tsp b/packages/azure-http-specs/specs/service/multi-service/main.tsp
new file mode 100644
index 0000000000..6f71022f93
--- /dev/null
+++ b/packages/azure-http-specs/specs/service/multi-service/main.tsp
@@ -0,0 +1,61 @@
+import "@typespec/versioning";
+import "@typespec/http";
+import "@typespec/spector";
+
+using Versioning;
+using Http;
+using Spector;
+
+namespace Service.MultiService;
+
+/*
+ * First service definition in a multi-service package with versioning
+ */
+@scenarioService("/service/multi-service/service-a")
+@versioned(VersionsA)
+namespace ServiceA {
+  enum VersionsA {
+    av1,
+    av2,
+  }
+
+  @route("foo")
+  interface Foo {
+    @scenario
+    @scenarioDoc("""
+        Test that a client can expose operations from multiple services. This operaton should be called like this: `client.foo.test(...)`.
+      
+        Expected path: /service/multi-service/service-a/foo/test
+        Expected query parameter: api-version=av2
+        Expected 204 response.
+      """)
+    @route("/test")
+    test(@query("api-version") apiVersion: VersionsA): void;
+  }
+}
+
+/**
+ * Second service definition in a multi-service package with versioning
+ */
+@scenarioService("/service/multi-service/service-b")
+@versioned(VersionsB)
+namespace ServiceB {
+  enum VersionsB {
+    bv1,
+    bv2,
+  }
+
+  @route("bar")
+  interface Bar {
+    @scenario
+    @scenarioDoc("""
+        Test that a client can expose operations from multiple services. This operaton should be called like this: `client.bar.test(...)`.
+      
+        Expected path: /service/multi-service/service-b/bar/test
+        Expected query parameter: api-version=bv2
+        Expected 204 response.
+      """)
+    @route("/test")
+    test(@query("api-version") apiVersion: VersionsB): void;
+  }
+}
diff --git a/packages/azure-http-specs/specs/service/multi-service/mockapi.ts b/packages/azure-http-specs/specs/service/multi-service/mockapi.ts
new file mode 100644
index 0000000000..0f81972235
--- /dev/null
+++ b/packages/azure-http-specs/specs/service/multi-service/mockapi.ts
@@ -0,0 +1,27 @@
+import { passOnSuccess, ScenarioMockApi } from "@typespec/spec-api";
+
+export const Scenarios: Record<string, ScenarioMockApi> = {};
+
+Scenarios.Service_MultiService_ServiceA_Foo_test = passOnSuccess({
+  uri: "/service/multi-service/service-a/foo/test",
+  method: "get",
+  request: {
+    query: {
+      "api-version": "av2",
+    },
+  },
+  response: { status: 204 },
+  kind: "MockApiDefinition",
+});
+
+Scenarios.Service_MultiService_ServiceB_Bar_test = passOnSuccess({
+  uri: "/service/multi-service/service-b/bar/test",
+  method: "get",
+  request: {
+    query: {
+      "api-version": "bv2",
+    },
+  },
+  response: { status: 204 },
+  kind: "MockApiDefinition",
+});