diff --git a/test/helpers/channels/surface-contract-registry.ts b/test/helpers/channels/surface-contract-registry.ts
index df60f701fd6..b1a00cdb404 100644
--- a/test/helpers/channels/surface-contract-registry.ts
+++ b/test/helpers/channels/surface-contract-registry.ts
@@ -1,4 +1,3 @@
-import { vi } from "vitest";
 import {
   listBundledChannelPlugins,
   setBundledChannelRuntime,
@@ -12,10 +11,6 @@ import {
 } from "../../../src/plugin-sdk/line.js";
 import { channelPluginSurfaceKeys, type ChannelPluginSurface } from "./manifest.js";
 
-function buildBundledPluginModuleId(pluginId: string, artifactBasename: string): string {
-  return ["..", "..", "..", "extensions", pluginId, artifactBasename].join("/");
-}
-
 type SurfaceContractEntry = {
   id: string;
   plugin: Pick<
@@ -46,13 +41,6 @@ type DirectoryContractEntry = {
   accountId?: string;
 };
 
-const sendMessageMatrixMock = vi.hoisted(() =>
-  vi.fn(async (to: string, _message: string, opts?: { threadId?: string }) => ({
-    messageId: opts?.threadId ? "$matrix-thread" : "$matrix-root",
-    roomId: to.replace(/^room:/, ""),
-  })),
-);
-
 setBundledChannelRuntime("line", {
   channel: {
     line: {
@@ -64,15 +52,6 @@ setBundledChannelRuntime("line", {
   },
 } as never);
 
-vi.mock(buildBundledPluginModuleId("matrix", "runtime-api.js"), async () => {
-  const matrixRuntimeApiModuleId = buildBundledPluginModuleId("matrix", "runtime-api.js");
-  const actual = await vi.importActual(matrixRuntimeApiModuleId);
-  return {
-    ...actual,
-    sendMessageMatrix: sendMessageMatrixMock,
-  };
-});
-
 let surfaceContractRegistryCache: SurfaceContractEntry[] | undefined;
 let threadingContractRegistryCache: ThreadingContractEntry[] | undefined;
 let directoryContractRegistryCache: DirectoryContractEntry[] | undefined;