test(tui): cover streaming markdown tables

codex-rs/tui/src/chatwidget/snapshots/codex_tui__chatwidget__tests__streaming_table_tail_active.snap

@@ -0,0 +1,8 @@
+---
+source: tui/src/chatwidget/tests/status_and_layout.rs
+expression: active_blob(&chat)
+---
+• ┌──────┬───────┐
+  │ Name │ Value │
+  ├──────┼───────┤
+  └──────┴───────┘

codex-rs/tui/src/chatwidget/tests/status_and_layout.rs

@@ -928,6 +928,40 @@ async fn streaming_final_answer_keeps_task_running_state() {
     assert!(!chat.bottom_pane.quit_shortcut_hint_visible());
 }
 
+#[tokio::test]
+async fn streaming_markdown_tail_updates_in_place_until_next_block_stabilizes_it() {
+    let (mut chat, mut rx, _op_rx) = make_chatwidget_manual(/*model_override*/ None).await;
+
+    chat.on_task_started();
+    chat.on_agent_message_delta("First paragraph\n".to_string());
+    assert_eq!(drain_insert_history(&mut rx).len(), 0);
+    assert_eq!(active_blob(&chat), "• First paragraph\n");
+
+    chat.on_agent_message_delta("\nSecond paragraph\n".to_string());
+    chat.on_commit_tick();
+    let inserted = drain_insert_history(&mut rx);
+    assert_eq!(inserted.len(), 1);
+    assert_eq!(lines_to_single_string(&inserted[0]), "• First paragraph\n");
+    assert_eq!(active_blob(&chat), "  \n  Second paragraph\n");
+}
+
+#[tokio::test]
+async fn streaming_table_tail_renders_from_complete_lines_only() {
+    let (mut chat, mut rx, _op_rx) = make_chatwidget_manual(/*model_override*/ None).await;
+
+    chat.on_task_started();
+    chat.on_agent_message_delta("| Name | Value |\n".to_string());
+    assert_eq!(drain_insert_history(&mut rx).len(), 0);
+    assert_eq!(active_blob(&chat), "• | Name | Value |\n");
+
+    chat.on_agent_message_delta("| --- | --- |\n".to_string());
+    assert_eq!(drain_insert_history(&mut rx).len(), 0);
+    assert_chatwidget_snapshot!("streaming_table_tail_active", active_blob(&chat));
+
+    chat.on_agent_message_delta("| A | 1 |".to_string());
+    assert_chatwidget_snapshot!("streaming_table_tail_active", active_blob(&chat));
+}
+
 #[tokio::test]
 async fn idle_commit_ticks_do_not_restore_status_without_commentary_completion() {
     let (mut chat, mut rx, _op_rx) = make_chatwidget_manual(/*model_override*/ None).await;

codex-rs/tui/src/markdown_render_tests.rs

@@ -56,6 +56,59 @@ fn paragraph_multiple() {
     );
 }
 
+#[test]
+fn table_renders_as_box() {
+    let text = render_markdown_text("| Name | Value |\n| --- | --- |\n| A | 1 |\n");
+
+    assert_eq!(
+        plain_lines(&text),
+        vec![
+            "┌──────┬───────┐",
+            "│ Name │ Value │",
+            "├──────┼───────┤",
+            "│ A    │ 1     │",
+            "└──────┴───────┘",
+        ],
+    );
+}
+
+#[test]
+fn table_respects_column_alignment() {
+    let text = render_markdown_text("| Left | Center | Right |\n| :--- | :---: | ---: |\n| a | b | c |\n");
+
+    assert_eq!(
+        plain_lines(&text),
+        vec![
+            "┌──────┬────────┬───────┐",
+            "│ Left │ Center │ Right │",
+            "├──────┼────────┼───────┤",
+            "│ a    │   b    │     c │",
+            "└──────┴────────┴───────┘",
+        ],
+    );
+}
+
+#[test]
+fn narrow_table_stays_boxed_even_when_it_overflows() {
+    let text = render_markdown_text_with_width_and_cwd(
+        "| Name | Description |\n| --- | --- |\n| Alpha | a value that wraps |\n",
+        Some(20),
+        /*cwd*/ None,
+    );
+
+    assert_eq!(
+        plain_lines(&text),
+        vec![
+            "┌───────┬─────────────┐",
+            "│ Name  │ Description │",
+            "├───────┼─────────────┤",
+            "│ Alpha │ a value     │",
+            "│       │ that wraps  │",
+            "└───────┴─────────────┘",
+        ],
+    );
+}
+
 #[test]
 fn headings() {
     let md = "# Heading 1\n## Heading 2\n### Heading 3\n#### Heading 4\n##### Heading 5\n###### Heading 6\n";
@@ -1203,6 +1256,7 @@ Table below (alignment test):
 | Left | Center | Right |
 |:-----|:------:|------:|
 | a    |   b    |     c |
+
 Inline HTML: <sup>sup</sup> and <sub>sub</sub>.
 HTML block:
 <div style="border:1px solid #ccc;padding:2px">inline block</div>

codex-rs/tui/src/snapshots/codex_tui__markdown_render__markdown_render_tests__markdown_render_complex_snapshot.snap

@@ -28,9 +28,13 @@ Image: alt text
 ———
 
 Table below (alignment test):
-| Left | Center | Right |
-|:-----|:------:|------:|
-| a    |   b    |     c |
+
+┌──────┬────────┬───────┐
+│ Left │ Center │ Right │
+├──────┼────────┼───────┤
+│ a    │   b    │     c │
+└──────┴────────┴───────┘
+
 Inline HTML: <sup>sup</sup> and <sub>sub</sub>.
 HTML block:
 <div style="border:1px solid #ccc;padding:2px">inline block</div>