Refactor VPN proxy client implementation

test/server/subscription-validation.test.js

@@ -0,0 +1,39 @@
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import test from 'node:test';
+
+import { createValidateSubscription } from '../../dist/server/features/subscription/index.js';
+import { createSubscriptionValidationRoute } from '../../dist/server/http/routes/subscriptionValidationRoute.js';
+
+test('subscription validation trims once and returns only the provider server count', async () => {
+  const calls = [];
+  const validate = createValidateSubscription(async (url) => {
+    calls.push(url);
+    return { servers: [{ id: 'one' }, { id: 'two' }], privateConfig: 'not returned' };
+  });
+
+  assert.deepEqual(await validate('  https://provider.example/sub  '), { servers: 2 });
+  assert.deepEqual(await validate(null), { servers: 2 });
+  assert.deepEqual(calls, ['https://provider.example/sub', 'null']);
+
+  const failure = new Error('provider failed');
+  await assert.rejects(createValidateSubscription(async () => { throw failure; })('url'), (error) => error === failure);
+});
+
+test('subscription validation route is the only method/path adapter', async () => {
+  const sent = [];
+  const route = createSubscriptionValidationRoute({
+    validateSubscription: async (url) => ({ servers: String(url).length }),
+    readBody: async () => ({ url: 'trimmed' }),
+    sendState: async (_res, extra) => { sent.push(extra); },
+  });
+  const response = {};
+
+  assert.equal(await route.handle({ method: 'GET', url: '/api/subscription/validate' }, response), false);
+  assert.equal(await route.handle({ method: 'POST', url: '/api/subscription/validate' }, response), true);
+  assert.deepEqual(sent, [{ servers: 7 }]);
+
+  const compositionSource = readFileSync(new URL('../../src/server/index.ts', import.meta.url), 'utf8');
+  assert.match(compositionSource, /createSubscriptionValidationRoute\(\{/);
+  assert.doesNotMatch(compositionSource, /req\.url === ['"]\/api\/subscription\/validate['"]/);
+});