test: harden MVP QA gate

src/lib/testing/external-api-mocks.test.ts

@@ -1,7 +1,22 @@
-import { describe, expect, test } from "vitest";
+import { setupServer } from "msw/node";
+import { afterAll, afterEach, beforeAll, describe, expect, test } from "vitest";
 import { externalApiHandlers } from "./external-api-mocks";
 
+const server = setupServer(...externalApiHandlers);
+
 describe("external API mocks", () => {
+  beforeAll(() => {
+    server.listen({ onUnhandledRequest: "error" });
+  });
+
+  afterEach(() => {
+    server.resetHandlers();
+  });
+
+  afterAll(() => {
+    server.close();
+  });
+
   test("defines deterministic handlers for deferred datasource adapters", () => {
     expect(externalApiHandlers).toHaveLength(3);
     expect(externalApiHandlers.map((handler) => handler.info.header)).toEqual([
@@ -10,4 +25,31 @@ describe("external API mocks", () => {
       "GET https://api.open-meteo.com/v1/forecast",
     ]);
   });
+
+  test("intercepts deferred datasource requests without live services", async () => {
+    const prometheus = await fetch(
+      "https://prometheus.dimensionlab.net/api/v1/query",
+    ).then((response) => response.json());
+    const status = await fetch(
+      "https://uptime.dimensionlab.net/api/status-page/dimensionlab",
+    ).then((response) => response.json());
+    const weather = await fetch(
+      "https://api.open-meteo.com/v1/forecast?latitude=52.37&longitude=4.9",
+    ).then((response) => response.json());
+
+    expect(prometheus).toMatchObject({
+      status: "success",
+      data: { result: [{ value: [1771430400, "1"] }] },
+    });
+    expect(status).toMatchObject({
+      status: "ok",
+      incidents: [],
+    });
+    expect(weather).toMatchObject({
+      current: {
+        temperature_2m: 21.4,
+        weather_code: 0,
+      },
+    });
+  });
 });