import pytest
from unittest.mock import MagicMock, patch
import tkinter as tk
from installer.screen import render_title, render_paragraph, TerminalConsole

@pytest.fixture
def mock_app():
    app = MagicMock()
    app.bg_canvas = MagicMock()
    app._canvas_items = []
    return app

def test_render_title(mock_app):
    render_title(mock_app, "Test Title", y=50)
    mock_app.bg_canvas.create_text.assert_called_once()
    args, kwargs = mock_app.bg_canvas.create_text.call_args
    assert args == (48, 50)
    assert kwargs['text'] == "Test Title"
    assert len(mock_app._canvas_items) == 1

def test_render_paragraph(mock_app):
    render_paragraph(mock_app, "Test Paragraph", y=100)
    mock_app.bg_canvas.create_text.assert_called_once()
    args, kwargs = mock_app.bg_canvas.create_text.call_args
    assert args == (48, 100)
    assert kwargs['text'] == "Test Paragraph"
    assert len(mock_app._canvas_items) == 1

def test_render_title_no_canvas():
    app = MagicMock()
    app.bg_canvas = None
    render_title(app, "Title")
    # Should not raise exception

@patch('platform.system', return_value='Darwin')
def test_terminal_console(mock_platform):
    root = tk.Tk()
    try:
        console = TerminalConsole(root)
        console.write("Hello\n")
        # In mock or headless env, we might not be able to check text content easily
        # but we can verify it doesn't crash and state is managed
        assert console.text.cget('state') == 'disabled'
        
        console.clear()
        assert console.text.cget('state') == 'disabled'
    finally:
        root.destroy()