refactor(core-testing): no-sentry → no-instrumentation (mocks OTel too)

packages/core-testing/src/setup/no-instrumentation.test.ts

@@ -0,0 +1,16 @@
+import { describe, it, expect, vi } from "vitest";
+import * as Sentry from "@sentry/nextjs";
+
+describe("setup/no-instrumentation guard (R49)", () => {
+  it("Sentry.init is a vi.fn (mocked, not real)", () => {
+    expect(vi.isMockFunction(Sentry.init)).toBe(true);
+  });
+
+  it("Sentry.captureException is a vi.fn", () => {
+    expect(vi.isMockFunction(Sentry.captureException)).toBe(true);
+  });
+
+  it("calling Sentry.init does not throw or initialize", () => {
+    expect(() => Sentry.init({ dsn: "https://x@y/1" } as Parameters<typeof Sentry.init>[0])).not.toThrow();
+  });
+});