Preserve native sessions during temporary server outages

src/session-recovery.test.js

@@ -0,0 +1,17 @@
+import assert from 'node:assert/strict';
+import { test } from 'node:test';
+import { sessionResponseState, sessionRetryDelay } from './session-recovery.js';
+
+test('only explicit authentication rejection invalidates a saved session', () => {
+  for (const status of [401, 403]) assert.equal(sessionResponseState(status), 'revoked');
+  for (const status of [404, 429, 500, 502, 503])
+    assert.equal(sessionResponseState(status), 'unavailable');
+  assert.equal(sessionResponseState(200), 'valid');
+});
+
+test('saved session retries follow the shared recovery schedule', () => {
+  assert.deepEqual(
+    Array.from({ length: 7 }, (_, attempt) => sessionRetryDelay(attempt)),
+    [0, 3000, 10000, 15000, 30000, 30000, 30000],
+  );
+});