diff --git a/src/test-utils/model-auth-mock.ts b/src/test-utils/model-auth-mock.ts
deleted file mode 100644
index 92553062273..00000000000
--- a/src/test-utils/model-auth-mock.ts
+++ /dev/null
@@ -1,18 +0,0 @@
-import { vi } from "vitest";
-
-type ModelAuthMockModule = {
-  resolveApiKeyForProvider: (...args: unknown[]) => unknown;
-  requireApiKey: (auth: { apiKey?: string; mode?: string }, provider: string) => string;
-};
-
-export function createModelAuthMockModule(): ModelAuthMockModule {
-  return {
-    resolveApiKeyForProvider: vi.fn() as (...args: unknown[]) => unknown,
-    requireApiKey: (auth: { apiKey?: string; mode?: string }, provider: string) => {
-      if (auth?.apiKey) {
-        return auth.apiKey;
-      }
-      throw new Error(`No API key resolved for provider "${provider}" (auth mode: ${auth?.mode}).`);
-    },
-  };
-}
diff --git a/src/test-utils/session-write-lock-module-mock.ts b/src/test-utils/session-write-lock-module-mock.ts
index a13d8019fbc..0d4013ae84e 100644
--- a/src/test-utils/session-write-lock-module-mock.ts
+++ b/src/test-utils/session-write-lock-module-mock.ts
@@ -1,4 +1,3 @@
-import { vi } from "vitest";
 import type * as SessionWriteLockModule from "../agents/session-write-lock.js";
 
 type SessionWriteLockModuleShape = typeof SessionWriteLockModule;
@@ -13,16 +12,3 @@ export async function buildSessionWriteLockModuleMock(
     acquireSessionWriteLock,
   };
 }
-
-export function resetModulesWithSessionWriteLockDoMock(
-  modulePath: string,
-  acquireSessionWriteLock: SessionWriteLockModuleShape["acquireSessionWriteLock"],
-): void {
-  vi.resetModules();
-  vi.doMock(modulePath, () =>
-    buildSessionWriteLockModuleMock(
-      () => vi.importActual<SessionWriteLockModuleShape>(modulePath),
-      acquireSessionWriteLock,
-    ),
-  );
-}