fix(testing): isolate bun module mocks across tests

src/testing/module-mock-lifecycle-nested/caller.ts

@@ -0,0 +1,7 @@
+type MockModuleApi = {
+  module: (specifier: string, factory: () => Record<string, unknown>) => unknown
+}
+
+export function mockNestedFixture(mockApi: MockModuleApi): void {
+  mockApi.module("./fixture", () => ({ named: "mocked" }))
+}