test: add MVP QA gate

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

@@ -0,0 +1,13 @@
+import { describe, expect, test } from "vitest";
+import { externalApiHandlers } from "./external-api-mocks";
+
+describe("external API mocks", () => {
+  test("defines deterministic handlers for deferred datasource adapters", () => {
+    expect(externalApiHandlers).toHaveLength(3);
+    expect(externalApiHandlers.map((handler) => handler.info.header)).toEqual([
+      "GET https://prometheus.dimensionlab.net/api/v1/query",
+      "GET https://uptime.dimensionlab.net/api/status-page/*",
+      "GET https://api.open-meteo.com/v1/forecast",
+    ]);
+  });
+});

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

@@ -0,0 +1,33 @@
+import { http, HttpResponse } from "msw";
+
+export const externalApiHandlers = [
+  http.get("https://prometheus.dimensionlab.net/api/v1/query", () =>
+    HttpResponse.json({
+      status: "success",
+      data: {
+        resultType: "vector",
+        result: [
+          {
+            metric: { instance: "fixture" },
+            value: [1771430400, "1"],
+          },
+        ],
+      },
+    }),
+  ),
+  http.get("https://uptime.dimensionlab.net/api/status-page/*", () =>
+    HttpResponse.json({
+      status: "ok",
+      incidents: [],
+      monitors: [{ name: "fixture", status: "up" }],
+    }),
+  ),
+  http.get("https://api.open-meteo.com/v1/forecast", () =>
+    HttpResponse.json({
+      current: {
+        temperature_2m: 21.4,
+        weather_code: 0,
+      },
+    }),
+  ),
+];