From 666674327f009e9b1013218fc384f193b64c6997 Mon Sep 17 00:00:00 2001
From: Elizabeth Hunt <me@liz.coffee>
Date: Sun, 14 Dec 2025 22:39:18 -0800
Subject: Adds unit tests

---
 tst/server_request_response.test.ts | 110 ++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 tst/server_request_response.test.ts

(limited to 'tst/server_request_response.test.ts')

diff --git a/tst/server_request_response.test.ts b/tst/server_request_response.test.ts
new file mode 100644
index 0000000..99e74d8
--- /dev/null
+++ b/tst/server_request_response.test.ts
@@ -0,0 +1,110 @@
+import {
+    Either,
+    JsonResponse,
+    PenguenoRequest,
+    PenguenoResponse,
+    getResponseMetrics,
+    MetricValueTag,
+    type BaseRequest,
+    type ServerTrace,
+} from '../lib/index';
+import { CollectingTrace, TestTraceable } from './test_utils';
+
+const makeBaseRequest = (overrides: Partial<BaseRequest> = {}): BaseRequest => ({
+    url: 'https://example.com/hello?x=1',
+    method: 'GET',
+    header: () => ({}),
+    formData: async () => new FormData(),
+    json: async () => ({}),
+    text: async () => '',
+    param: () => undefined,
+    query: () => ({}),
+    queries: () => ({}),
+    ...overrides,
+});
+
+describe('server/request + server/response', () => {
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.setSystemTime(new Date('2020-01-01T00:00:00.000Z'));
+    });
+
+    afterEach(() => {
+        jest.useRealTimers();
+        jest.restoreAllMocks();
+    });
+
+    test('PenguenoRequest.from creates response headers', () => {
+        jest.spyOn(globalThis.crypto, 'randomUUID').mockReturnValue('00000000-0000-0000-0000-000000000000');
+        jest.spyOn(Math, 'random').mockReturnValue(0);
+
+        const baseReq = makeBaseRequest();
+        const trace = new CollectingTrace<ServerTrace>();
+        const req = PenguenoRequest.from(TestTraceable.of(baseReq, trace));
+
+        jest.setSystemTime(new Date('2020-01-01T00:00:01.000Z'));
+        const headers = req.get().getResponseHeaders();
+
+        expect(headers).toMatchObject({
+            RequestId: '00000000-0000-0000-0000-000000000000',
+            Hai: 'hewwo :D',
+        });
+        expect(headers.DeltaUnix).toBe('1000');
+        expect(headers.RequestReceivedUnix).toBe('1577836800000');
+        expect(headers.RequestHandleUnix).toBe('1577836801000');
+    });
+
+    test('PenguenoResponse sets headers and emits metrics', () => {
+        jest.spyOn(globalThis.crypto, 'randomUUID').mockReturnValue('00000000-0000-0000-0000-000000000000');
+        jest.spyOn(Math, 'random').mockReturnValue(0);
+
+        const trace = new CollectingTrace<ServerTrace>();
+        const req = PenguenoRequest.from(TestTraceable.of(makeBaseRequest(), trace));
+
+        jest.setSystemTime(new Date('2020-01-01T00:00:01.000Z'));
+        const res = new PenguenoResponse(req, 'hi', { status: 200, headers: { X: 'Y' } });
+
+        expect(res.status).toBe(200);
+        expect(res.statusText).toBe('OK');
+        expect(res.headers['Content-Type']).toBe('text/plain; charset=utf-8');
+        expect(res.headers.X).toBe('Y');
+
+        const lastTrace = trace.events[trace.events.length - 1];
+        expect(lastTrace).toBeDefined();
+
+        const metricValues = lastTrace[lastTrace.length - 1] as any[];
+        expect(Array.isArray(metricValues)).toBe(true);
+        expect(
+            metricValues.some((m) => m._tag === MetricValueTag && m.name === 'response.2xx.count' && m.value === 1),
+        ).toBe(true);
+    });
+
+    test('JsonResponse formats Either bodies', () => {
+        jest.spyOn(globalThis.crypto, 'randomUUID').mockReturnValue('00000000-0000-0000-0000-000000000000');
+
+        const trace = new CollectingTrace<ServerTrace>();
+        const req = PenguenoRequest.from(TestTraceable.of(makeBaseRequest(), trace));
+
+        const ok = new JsonResponse(req, Either.right('yay'), { status: 200, headers: {} });
+        expect(ok.headers['Content-Type']).toBe('application/json; charset=utf-8');
+        expect(ok.body()).toBe('{"ok":"yay"}');
+
+        const err = new JsonResponse(req, Either.left('nope'), { status: 400, headers: {} });
+        expect(err.body()).toBe('{"error":"nope"}');
+    });
+
+    test('getResponseMetrics returns one active bucket', () => {
+        jest.setSystemTime(new Date('2020-01-01T00:00:00.000Z'));
+        const metrics = getResponseMetrics(201, 12);
+
+        expect(metrics).toEqual(
+            expect.arrayContaining([
+                expect.objectContaining({ name: 'response.2xx.count', value: 1 }),
+                expect.objectContaining({ name: 'response.2xx.time', value: 12 }),
+            ]),
+        );
+
+        const inactive = metrics.filter((m) => m.value === 0);
+        expect(inactive).toHaveLength(5);
+    });
+});
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