snapshot of https://github.com/zulip/zulip.git @ 48c69911c7dd4e03b20552eb3bd77ad8151c1357 (2026-09-15)

web/tests/topic_list.test.cjs

@@ -0,0 +1,81 @@
+"use strict";
+
+const assert = require("node:assert/strict");
+
+const {make_realm} = require("./lib/example_realm.cjs");
+const {mock_esm, zrequire} = require("./lib/namespace.cjs");
+const {run_test, noop} = require("./lib/test.cjs");
+
+const stream_topic_history_util = mock_esm("../src/stream_topic_history_util");
+mock_esm("../src/people.ts", {
+    maybe_get_user_by_id: noop,
+});
+
+const recent_view_messages_data = zrequire("recent_view_messages_data");
+const {set_realm} = zrequire("state_data");
+const stream_data = zrequire("stream_data");
+const stream_topic_history = zrequire("stream_topic_history");
+const topic_list = zrequire("topic_list");
+
+set_realm(make_realm());
+
+function test(label, f) {
+    run_test(label, (helpers) => {
+        f(helpers);
+    });
+}
+
+test("is_full_topic_history_available", ({override}) => {
+    const stream_id = 21;
+    const general = {
+        name: "general",
+        stream_id,
+        first_message_id: null,
+        subscriber_count: 0,
+    };
+    const messages = [
+        {id: 1, stream_id},
+        {id: 2, stream_id},
+        {id: 3, stream_id},
+    ];
+    const sub = stream_data.create_sub_from_server_data(general);
+
+    // Currently, recent_view_messages_data is empty.
+    assert.equal(topic_list.is_full_topic_history_available(stream_id), false);
+
+    recent_view_messages_data.recent_view_messages_data.clear();
+    recent_view_messages_data.recent_view_messages_data.add_messages(messages, true);
+
+    let has_found_newest = false;
+
+    override(
+        recent_view_messages_data.recent_view_messages_data.fetch_status,
+        "has_found_newest",
+        () => has_found_newest,
+    );
+
+    assert.equal(topic_list.is_full_topic_history_available(stream_id), false);
+    has_found_newest = true;
+    // sub.first_message_id === null
+    assert.equal(topic_list.is_full_topic_history_available(stream_id), true);
+
+    // Note that we'll return `true` here due to
+    // fetched_stream_ids having the stream_id now.
+    assert.equal(topic_list.is_full_topic_history_available(stream_id), true);
+
+    // Clear the data, otherwise `is_full_topic_history_available`
+    // will always return true due to stream_id in fetched_stream_ids.
+    stream_topic_history.reset();
+
+    sub.first_message_id = 0;
+    assert.equal(topic_list.is_full_topic_history_available(stream_id), false);
+
+    sub.first_message_id = 2;
+    let full_topic_history_fetched_and_widget_updated = false;
+    stream_topic_history_util.get_server_history = (stream_id) => {
+        assert.equal(stream_id, general.stream_id);
+        full_topic_history_fetched_and_widget_updated = true;
+    };
+    assert.equal(topic_list.is_full_topic_history_available(stream_id), true);
+    assert.equal(full_topic_history_fetched_and_widget_updated, true);
+});