Bring back dynamic UI test; but with messages passed to .ui()

Author: cpsievert

tests/playwright/shiny/components/chat/dynamic_ui/app.py

@@ -0,0 +1,8 @@
+from shiny.express import render, ui
+
+chat = ui.Chat(id="chat")
+
+
+@render.ui
+def chat_output():
+    return chat.ui(messages=["A starting message"])

tests/playwright/shiny/components/chat/dynamic_ui/test_chat_dynamic_ui.py

@@ -0,0 +1,15 @@
+from playwright.sync_api import Page, expect
+from utils.deploy_utils import skip_on_webkit
+
+from shiny.playwright import controller
+from shiny.run import ShinyAppProc
+
+
+@skip_on_webkit
+def test_validate_chat_basic(page: Page, local_app: ShinyAppProc) -> None:
+    page.goto(local_app.url)
+
+    chat = controller.Chat(page, "chat")
+
+    expect(chat.loc).to_be_visible(timeout=30 * 1000)
+    chat.expect_latest_message("A starting message", timeout=30 * 1000)