import os
from web.db import CachedPage
from web.utils import get_cache_dir


def test_cachedpage_abs_path(tmp_path, monkeypatch):
    # Create a fake cache dir and monkeypatch get_cache_dir
    fake_cache = tmp_path / 'cache'
    fake_cache.mkdir()
    monkeypatch.setenv('PYTHONIOENCODING', 'utf-8')

    # Patch the symbol used by CachedPage.abs_path (imported into web.db)
    monkeypatch.setattr('web.db.get_cache_dir', lambda: str(fake_cache))

    # Create a CachedPage instance and set file_path attribute
    cp = CachedPage()
    setattr(cp, 'file_path', 'subdir/test.html')

    # Ensure the computed absolute path joins the fake cache dir
    expected = os.path.join(os.path.abspath(
        str(fake_cache)), 'subdir/test.html')
    assert cp.abs_path == expected

    # When file_path is falsy, abs_path should be None
    cp2 = CachedPage()
    setattr(cp2, 'file_path', None)
    assert cp2.abs_path is None