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.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_clipper = MagicMock()
  _mock_clipper.step.side_effect = [True, False]
  _mock_clipper.display_start = 0
  _mock_clipper.display_end = 30
  mock_imgui.ListClipper = MagicMock(return_value=_mock_clipper)
  mock_imgui.ListClipper.return_value.begin = 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()
  app_instance.controller = 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 []
 kwargs = call_args[1] if len(call_args) > 1 else {}
 size_arg = args_list[1] if len(args_list) > 1 else kwargs.get("size_x", 0)
 if hasattr(size_arg, 'x'):
  size_x, size_y = size_arg.x, size_arg.y
 else:
  size_x = size_arg
  size_y = kwargs.get("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})"