Dashboard: Wait for Inputs, Fix Python 3.14

src/python/impactx/dashboard/start.py

@@ -6,6 +6,8 @@
 License: BSD-3-Clause-LBNL
 """
 
+import asyncio
+
 from . import server, state
 from .app import application
 from .Input.defaults import DashboardDefaults
@@ -42,6 +44,18 @@ class DashboardApp:
 
     def start(self):
         setup_dashboard()
+
+        # Ensure an event loop exists for Python 3.10+ (required on macOS)
+        # This prevents RuntimeError when server.start() tries to get_event_loop()
+        # In Python 3.10+, get_event_loop() raises RuntimeError if no loop exists
+        # We create and set one if needed
+        try:
+            asyncio.get_event_loop()
+        except RuntimeError:
+            # No event loop exists in this thread, create and set one
+            loop = asyncio.new_event_loop()
+            asyncio.set_event_loop(loop)
+
         server.start()
         return 0
 

tests/python/dashboard/test_python_import.py

@@ -72,7 +72,12 @@ def test_python_import(dashboard):
 
     # Check input values
     for element_id, expected_value in DISTRIBUTION_VALUES + LATTICE_CONFIGURATION:
-        actual_value = float(dashboard.sb.get_value(element_id))
+        # Wait for element to be present in the DOM (doesn't require visibility)
+        # This is important for CI environments where rendering may be slower
+        dashboard.sb.wait_for_element_present(element_id, timeout=10)
+
+        # Get the value attribute - this works even if the element isn't visible
+        actual_value = float(dashboard.sb.get_attribute(element_id, "value"))
         assert actual_value == pytest.approx(expected_value, **APPROX_TOL), (
             f"{element_id}: expected {expected_value}, got {actual_value}"
         )

tests/python/dashboard/utils.py

@@ -61,13 +61,13 @@ def wait_for_interaction_ready(sb, timeout=TIMEOUT):
     https://github.com/Kitware/trame-client/blob/master/trame_client/utils/testing.py#L132
 
     """
-    for i in range(timeout):
-        print(f"Waiting for dashboard to load - ({i + 1}s elapsed)")
-        if sb.is_element_present(".trame__loader"):
-            sb.sleep(1)
-        else:
-            print("Ready to interact with.")
-            return
+    print("Waiting for dashboard to load...")
+
+    # Wait for the dashboard to finish loading.
+    # This ensures all UI elements are rendered before we manipulate or check their values
+    sb.wait_for_element_present("#Input_route", timeout=10)
+
+    print("Ready to interact with.")
 
 
 def wait_for_server_ready(process, timeout=TIMEOUT):