From f9b7a7714088b06e9cd2ce57fcc698a0da1c6a4d Mon Sep 17 00:00:00 2001
From: Sameh Khamis <sameh@halfpixel.ai>
Date: Tue, 10 Nov 2026 13:42:08 -0800
Subject: [PATCH] test(shipwrecks): the page deadline subtracts the newest
 available source's reported age from the limit

---
 src/layers/shipwrecks/index.test.mjs | 35 +++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/src/layers/shipwrecks/index.test.mjs b/src/layers/shipwrecks/index.test.mjs
index 56cf34fde..6362be2e7 100644
--- a/src/layers/shipwrecks/index.test.mjs
+++ b/src/layers/shipwrecks/index.test.mjs
@@ -2,7 +2,11 @@ import test from 'node:test';
 import assert from 'node:assert/strict';
 import * as Cesium from 'cesium';
 import * as picking from '../../data/pickRegistry.js';
-import { createShipwrecksLayer, markerPixelSize } from './index.js';
+import {
+  createShipwrecksLayer,
+  markerPixelSize,
+  snapshotDeadline,
+} from './index.js';
 
 const wreck = (id, extra = {}) => ({
   id,
@@ -348,3 +352,32 @@ test('a snapshot with no timestamp or ages still expires seven days after it arr
   await h.layer.update();
   assert.equal(h.layer.getStats().count, 0);
 });
+
+test('the page deadline subtracts the newest available source age from the limit', () => {
+  const DAY = 24 * 60 * 60 * 1000;
+  const both = { emodnet: true, wikidata: true };
+  assert.equal(
+    snapshotDeadline(
+      {
+        sources: both,
+        ages: { emodnet: 2 * DAY, wikidata: 6.5 * DAY },
+        maxAgeMs: 5 * DAY,
+      },
+      100,
+    ),
+    100 + 3 * DAY,
+  );
+  assert.equal(
+    snapshotDeadline(
+      {
+        sources: { emodnet: false, wikidata: true },
+        ages: { emodnet: null, wikidata: 4 * DAY },
+        maxAgeMs: 5 * DAY,
+      },
+      0,
+    ),
+    1 * DAY,
+    'an unavailable source does not count',
+  );
+  assert.equal(snapshotDeadline({ sources: both }, 0), 7 * DAY, 'defaults');
+});