diff --git a/web/e2e/specs/_meta/mock-overrides.spec.ts b/web/e2e/specs/_meta/mock-overrides.spec.ts
new file mode 100644
index 0000000000..8acd53f7a9
--- /dev/null
+++ b/web/e2e/specs/_meta/mock-overrides.spec.ts
@@ -0,0 +1,77 @@
+/**
+ * Self-tests for the mock override helpers. Verifies each helper
+ * intercepts the matched URL and returns the expected payload/status.
+ */
+
+import { test, expect } from "../../fixtures/frigate-test";
+import {
+  mockEmpty,
+  mockError,
+  mockDelay,
+} from "../../helpers/mock-overrides";
+
+test.describe("Mock Overrides — empty @meta", () => {
+  test("mockEmpty returns []", async ({ page, frigateApp }) => {
+    await mockEmpty(page, "**/api/__meta_test__");
+    await frigateApp.goto("/");
+    const result = await page.evaluate(async () => {
+      const r = await fetch("/api/__meta_test__");
+      return { status: r.status, body: await r.json() };
+    });
+    expect(result.status).toBe(200);
+    expect(result.body).toEqual([]);
+  });
+});
+
+test.describe("Mock Overrides — error default @meta", () => {
+  // Match both the collected request error and the browser's console echo.
+  // Using a single alternation regex avoids Playwright's isFixtureTuple
+  // collision with multi-element RegExp arrays.
+  test.use({
+    expectedErrors: [/500.*__meta_test__|Failed to load resource.*500/],
+  });
+
+  test("mockError returns 500 by default", async ({ page, frigateApp }) => {
+    await mockError(page, "**/api/__meta_test__");
+    await frigateApp.goto("/");
+    const status = await page.evaluate(async () => {
+      const r = await fetch("/api/__meta_test__");
+      return r.status;
+    });
+    expect(status).toBe(500);
+  });
+});
+
+test.describe("Mock Overrides — error custom status @meta", () => {
+  // The browser emits a "Failed to load resource" console.error for 404s,
+  // which the error collector catches even though 404 is not a 5xx.
+  test.use({
+    expectedErrors: [/Failed to load resource.*404|404.*__meta_test_404__/],
+  });
+
+  test("mockError accepts a custom status", async ({ page, frigateApp }) => {
+    await mockError(page, "**/api/__meta_test_404__", 404);
+    await frigateApp.goto("/");
+    const status = await page.evaluate(async () => {
+      const r = await fetch("/api/__meta_test_404__");
+      return r.status;
+    });
+    expect(status).toBe(404);
+  });
+});
+
+test.describe("Mock Overrides — delay @meta", () => {
+  test("mockDelay delays response by the requested ms", async ({
+    page,
+    frigateApp,
+  }) => {
+    await mockDelay(page, "**/api/__meta_test_delay__", 300, ["delayed"]);
+    await frigateApp.goto("/");
+    const elapsed = await page.evaluate(async () => {
+      const start = performance.now();
+      await fetch("/api/__meta_test_delay__");
+      return performance.now() - start;
+    });
+    expect(elapsed).toBeGreaterThanOrEqual(250);
+  });
+});