diff --git a/src/plugin-activation-boundary.test.ts b/src/plugin-activation-boundary.test.ts
index 4ea1d648231..54bf3c59f3a 100644
--- a/src/plugin-activation-boundary.test.ts
+++ b/src/plugin-activation-boundary.test.ts
@@ -19,6 +19,22 @@ const loadBundledPluginPublicSurfaceModuleSync = vi.hoisted(() =>
   }),
 );
 
+const loadPluginManifestRegistry = vi.hoisted(() =>
+  vi.fn(() => ({
+    diagnostics: [],
+    plugins: [
+      {
+        channelEnvVars: {
+          discord: ["DISCORD_BOT_TOKEN"],
+          irc: ["IRC_HOST", "IRC_NICK"],
+          slack: ["SLACK_BOT_TOKEN"],
+          telegram: ["TELEGRAM_BOT_TOKEN"],
+        },
+      },
+    ],
+  })),
+);
+
 const facadeMockHelpers = vi.hoisted(() => {
   const createLazyFacadeObjectValue = <T extends object>(load: () => T): T =>
     new Proxy(
@@ -38,6 +54,10 @@ const facadeMockHelpers = vi.hoisted(() => {
   return { createLazyFacadeArrayValue, createLazyFacadeObjectValue };
 });
 
+vi.mock("./plugins/manifest-registry.js", () => ({
+  loadPluginManifestRegistry,
+}));
+
 vi.mock("./plugin-sdk/facade-loader.js", () => ({
   ...facadeMockHelpers,
   listImportedBundledPluginFacadeIds: () => [],