Progress on context composition

simulation/sim_test_context_preview.py

@@ -0,0 +1,35 @@
+import sys
+import os
+from pathlib import Path
+sys.path.insert(0, str(Path(__file__).parent.parent.resolve()))
+
+import asyncio
+from simulation.sim_base import run_sim
+from simulation.sim_tools import click_tab, click_button_by_label
+from src.gui_2 import App
+from src.models import FileItem
+
+async def verify_preview(app: App):
+    # Let the GUI render once
+    await asyncio.sleep(0.1)
+
+    app.context_files = [FileItem(path='src/aggregate.py', auto_aggregate=True)]
+    app.controller.context_files = app.context_files
+    
+    # Try rendering _render_files_and_media
+    app.show_windows["Context Preview"] = True
+    
+    await asyncio.sleep(0.1)
+    click_tab(app, "Context Composition")
+    await asyncio.sleep(0.1)
+
+    click_button_by_label(app, "Preview##ctx")
+    await asyncio.sleep(0.2)
+
+    print("--- PREVIEW TEXT ---")
+    print(repr(app.context_preview_text[:200]))
+    print("--------------------")
+
+if __name__ == "__main__":
+    os.environ['SLOP_TEST_HOOKS'] = '1'
+    run_sim(verify_preview)