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_filters_activity.test.ts | 96 +++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 tst/server_filters_activity.test.ts

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

diff --git a/tst/server_filters_activity.test.ts b/tst/server_filters_activity.test.ts
new file mode 100644
index 0000000..a992e10
--- /dev/null
+++ b/tst/server_filters_activity.test.ts
@@ -0,0 +1,96 @@
+import {
+    Either,
+    HealthCheckActivityImpl,
+    HealthCheckOutput,
+    PenguenoError,
+    PenguenoRequest,
+    jsonModel,
+    requireMethod,
+    type BaseRequest,
+    type ServerTrace,
+} from '../lib/index';
+import { CollectingTrace, TestTraceable } from './test_utils';
+
+const makeBaseRequest = (overrides: Partial<BaseRequest> = {}): BaseRequest => ({
+    url: 'https://example.com/hello',
+    method: 'GET',
+    header: () => ({}),
+    formData: async () => new FormData(),
+    json: async () => ({}),
+    text: async () => '',
+    param: () => undefined,
+    query: () => ({}),
+    queries: () => ({}),
+    ...overrides,
+});
+
+describe('server filters + activities', () => {
+    beforeEach(() => {
+        jest.useFakeTimers();
+        jest.setSystemTime(new Date('2020-01-01T00:00:00.000Z'));
+        jest.spyOn(globalThis.crypto, 'randomUUID').mockReturnValue('00000000-0000-0000-0000-000000000000');
+    });
+
+    afterEach(() => {
+        jest.useRealTimers();
+        jest.restoreAllMocks();
+    });
+
+    test('requireMethod rejects unallowed methods', () => {
+        const trace = new CollectingTrace<ServerTrace>();
+        const req = PenguenoRequest.from(TestTraceable.of(makeBaseRequest({ method: 'GET' }), trace));
+
+        const res = requireMethod(['POST'])(req);
+        const err = res.left().get();
+
+        expect(err).toBeInstanceOf(PenguenoError);
+        expect(err.status).toBe(405);
+    });
+
+    test('jsonModel transforms valid JSON', async () => {
+        const trace = new CollectingTrace<ServerTrace>();
+        const req = PenguenoRequest.from(
+            TestTraceable.of(
+                makeBaseRequest({
+                    json: async () => ({ hello: 'world' }),
+                }),
+                trace,
+            ),
+        );
+
+        const filter = jsonModel((json) => {
+            const body = json.get() as { hello?: string };
+            return body.hello === 'world' ? Either.right('ok') : Either.left(new PenguenoError('bad json', 400));
+        });
+
+        const res = await filter(req);
+        expect(res.right().get()).toBe('ok');
+    });
+
+    test('jsonModel returns 400 for invalid JSON', async () => {
+        const trace = new CollectingTrace<ServerTrace>();
+        const req = PenguenoRequest.from(
+            TestTraceable.of(
+                makeBaseRequest({
+                    json: async () => Promise.reject(new Error('nope')),
+                }),
+                trace,
+            ),
+        );
+
+        const filter = jsonModel((_json) => Either.right('never'));
+        const res = await filter(req);
+        expect(res.left().get().status).toBe(400);
+    });
+
+    test('HealthCheckActivityImpl returns 200 on success', async () => {
+        const trace = new CollectingTrace<ServerTrace>();
+        const req = PenguenoRequest.from(TestTraceable.of(makeBaseRequest(), trace));
+
+        const activity = new HealthCheckActivityImpl(async () => Either.right(HealthCheckOutput.YAASSSLAYQUEEN));
+        const res = await activity.checkHealth(req);
+
+        expect(res.status).toBe(200);
+        expect(res.body()).toBe('{"ok":"ok"}');
+    });
+});
-- 
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