Chore: homepage tests (#6278)

src/__tests__/pages/api/siteMonitor.test.js

@@ -0,0 +1,103 @@
+import { beforeEach, describe, expect, it, vi } from "vitest";
+
+import createMockRes from "test-utils/create-mock-res";
+
+const { getServiceItem, httpProxy, perf, logger } = vi.hoisted(() => ({
+  getServiceItem: vi.fn(),
+  httpProxy: vi.fn(),
+  perf: { now: vi.fn() },
+  logger: { debug: vi.fn() },
+}));
+
+vi.mock("perf_hooks", () => ({
+  performance: perf,
+}));
+
+vi.mock("utils/config/service-helpers", () => ({
+  getServiceItem,
+}));
+
+vi.mock("utils/proxy/http", () => ({
+  httpProxy,
+}));
+
+vi.mock("utils/logger", () => ({
+  default: () => logger,
+}));
+
+import handler from "pages/api/siteMonitor";
+
+describe("pages/api/siteMonitor", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it("returns 400 when the service item is missing", async () => {
+    getServiceItem.mockResolvedValueOnce(null);
+
+    const req = { query: { groupName: "g", serviceName: "s" } };
+    const res = createMockRes();
+
+    await handler(req, res);
+
+    expect(res.statusCode).toBe(400);
+    expect(res.body.error).toContain("Unable to find service");
+  });
+
+  it("returns 400 when the monitor URL is missing", async () => {
+    getServiceItem.mockResolvedValueOnce({ siteMonitor: "" });
+
+    const req = { query: { groupName: "g", serviceName: "s" } };
+    const res = createMockRes();
+
+    await handler(req, res);
+
+    expect(res.statusCode).toBe(400);
+    expect(res.body.error).toBe("No http monitor URL given");
+  });
+
+  it("uses HEAD and returns status + latency when the response is OK", async () => {
+    getServiceItem.mockResolvedValueOnce({ siteMonitor: "http://example.com" });
+    perf.now.mockReturnValueOnce(1).mockReturnValueOnce(11);
+    httpProxy.mockResolvedValueOnce([200]);
+
+    const req = { query: { groupName: "g", serviceName: "s" } };
+    const res = createMockRes();
+
+    await handler(req, res);
+
+    expect(httpProxy).toHaveBeenCalledWith("http://example.com", { method: "HEAD" });
+    expect(res.statusCode).toBe(200);
+    expect(res.body.status).toBe(200);
+    expect(res.body.latency).toBe(10);
+  });
+
+  it("falls back to GET when HEAD is rejected", async () => {
+    getServiceItem.mockResolvedValueOnce({ siteMonitor: "http://example.com" });
+    perf.now.mockReturnValueOnce(1).mockReturnValueOnce(2).mockReturnValueOnce(5).mockReturnValueOnce(15);
+    httpProxy.mockResolvedValueOnce([500]).mockResolvedValueOnce([200]);
+
+    const req = { query: { groupName: "g", serviceName: "s" } };
+    const res = createMockRes();
+
+    await handler(req, res);
+
+    expect(httpProxy).toHaveBeenNthCalledWith(1, "http://example.com", { method: "HEAD" });
+    expect(httpProxy).toHaveBeenNthCalledWith(2, "http://example.com");
+    expect(res.statusCode).toBe(200);
+    expect(res.body).toEqual({ status: 200, latency: 10 });
+  });
+
+  it("returns 400 when httpProxy throws", async () => {
+    getServiceItem.mockResolvedValueOnce({ siteMonitor: "http://example.com" });
+    httpProxy.mockRejectedValueOnce(new Error("nope"));
+
+    const req = { query: { groupName: "g", serviceName: "s" } };
+    const res = createMockRes();
+
+    await handler(req, res);
+
+    expect(res.statusCode).toBe(400);
+    expect(res.body.error).toContain("Error attempting http monitor");
+  });
+});