from unittest.mock import patch, MagicMock
from src.gui_2 import render_prior_session_view

def test_prior_session_view_opens_scroll_child_with_explicit_size(app_instance):
 app_instance.controller.prior_disc_entries = [{"role": "User", "content": f"entry {i}", "collapsed": False, "ts": f"t{i}"} for i in range(30)]
 app_instance.perf_profiling_enabled = False
 with patch("src.gui_2.imgui") as mock_imgui, patch("src.gui_2.imscope") as mock_imscope, patch("src.gui_2.theme") as mock_theme:
  _avail = type("P", (), {"x": 800.0, "y": 600.0})()
  mock_imgui.get_content_region_avail = MagicMock(return_value=_avail)
  def _imvec2(x, y=0): m = MagicMock(); m.x = float(x); m.y = float(y); return m
  mock_imgui.ImVec2 = _imvec2
  mock_imscope.style_color = MagicMock()
  mock_imscope.style_color.return_value.__enter__ = MagicMock()
  mock_imscope.style_color.return_value.__exit__ = MagicMock()
  mock_imscope.child = MagicMock()
  mock_imscope.child.return_value.__enter__ = MagicMock()
  mock_imscope.child.return_value.__exit__ = MagicMock()
  mock_imscope.id = MagicMock()
  mock_imscope.id.return_value.__enter__ = MagicMock()
  mock_imscope.id.return_value.__exit__ = MagicMock()
  mock_imgui.button = MagicMock(return_value=False)
  mock_imgui.same_line = MagicMock()
  mock_imgui.text_colored = MagicMock()
  mock_imgui.text = MagicMock()
  mock_imgui.separator = MagicMock()
  mock_theme.ai_text_style = MagicMock()
  mock_theme.ai_text_style.return_value.__enter__ = MagicMock()
  mock_theme.ai_text_style.return_value.__exit__ = MagicMock()
  try:
   render_prior_session_view(app_instance)
  except Exception as e:
   import pytest
   pytest.fail(f"render_prior_session_view raised: {e}")
  assert mock_imscope.child.called, "prior_scroll child should be opened"
  call_args = mock_imscope.child.call_args
  args_list = call_args[0] if call_args[0] else []
  size_arg = args_list[1] if len(args_list) > 1 else 0
  if hasattr(size_arg, 'x'):
   size_x, size_y = size_arg.x, size_arg.y
  else:
   size_x = size_arg
   size_y = 0
  assert size_x == 800.0 and size_y == 600.0, f"prior_scroll should use explicit content region size, got ({size_x}, {size_y})"
  id_calls = [c for c in mock_imscope.id.call_args_list]
  assert len(id_calls) == 30, f"expected 30 imscope.id calls (one per entry), got {len(id_calls)}"