Update playwright test to include error notification

Author: cpsievert

tests/playwright/shiny/components/MarkdownStream/basic/app.py

@@ -2,24 +2,40 @@
 
 from shiny.express import ui
 
+# Read in the py-shiny README.md file
 readme = Path(__file__).parent / "README.md"
 with open(readme, "r") as f:
     readme_chunks = f.read().replace("\n", " \n ").split(" ")
 
 
-# Generate words from the README.md file (with a small delay)
-def chunk_generator():
+stream = ui.MarkdownStream("shiny-readme")
+stream2 = ui.MarkdownStream("shiny-readme-err")
+
+
+def readme_generator():
+    for chunk in readme_chunks:
+        yield chunk + " "
+
+
+def readme_generator_err():
     for chunk in readme_chunks:
         yield chunk + " "
+        if chunk == "Shiny":
+            raise RuntimeError("boom!")
 
 
-md = ui.MarkdownStream("shiny-readme")
+stream.stream(readme_generator())
+stream2.stream(readme_generator_err())
+
 
 with ui.card(
     height="400px",
     class_="mt-3",
 ):
     ui.card_header("Shiny README.md")
-    md.ui()
+    stream.ui()
+
 
-md.stream(chunk_generator())
+with ui.card(class_="mt-3"):
+    ui.card_header("Shiny README.md with error")
+    stream2.ui()

tests/playwright/shiny/components/MarkdownStream/basic/test_stream_basic.py

@@ -35,3 +35,11 @@ def test_validate_stream_basic(page: Page, local_app: ShinyAppProc) -> None:
     # all the way to the bottom
     is_scrolled = is_element_scrolled_to_bottom(page, ".card-body")
     assert is_scrolled, "The card body container should be scrolled to the bottom"
+
+    stream2 = page.locator("#shiny-readme-err")
+    expect(stream2).to_be_visible(timeout=30 * 1000)
+    expect(stream2).to_contain_text("Shiny")
+
+    notification = page.locator(".shiny-notification-error")
+    expect(notification).to_be_visible(timeout=30 * 1000)
+    expect(notification).to_contain_text("boom!")