Prefetch visible post threads after a bounded reading dwell

1 files changed, 18 insertions, 0 deletions

diff --git a/tools/thread-cache-test.js b/tools/thread-cache-test.js
index 6bac353..67b191b 100644
--- a/tools/thread-cache-test.js
+++ b/tools/thread-cache-test.js
@@ -139,6 +139,24 @@ try {
     assert.equal(restored.root.id, r.id);
     assert.equal(restored.replies.length, 2);
   });
+  for (const clickWhileLoading of [false, true]) {
+    const warm = makeFeature(), seed = note(clickWhileLoading ? 501 : 500);
+    const answer = note(clickWhileLoading ? 511 : 510, [['e', seed.id, '', 'root']]);
+    requests = [];
+    const prefetched = warm.feature.testThread(seed, true);
+    await wait(() => waiting.length === 1);
+    if (clickWhileLoading) assert.equal(warm.feature.testThread(seed), prefetched);
+    for (const q of waiting.splice(0)) q.resolve([answer]);
+    await prefetched.loading;
+    if (!clickWhileLoading) assert.equal(store.find(seed.id), null, 'speculation does not evict persisted visits');
+    const opened = warm.feature.testThread(seed);
+    assert.equal(opened, prefetched);
+    assert.equal(opened.status, 'ready');
+    assert.equal(opened.replies[0].id, answer.id);
+    assert.equal(requests.length, 1, 'click shares the existing relay query');
+    assert.equal(store.find(seed.id).replies[0].id, answer.id);
+  }
+  console.log('✓ clicks reuse completed and in-flight prefetches and persist visited threads');
   const deepLink = makeFeature();
   requests = [];
   await deepLink.feature.testOpen({ id: e.id });