import zipfile
import datetime
from utils import backup


def test_backup_creates_zip(tmp_path, monkeypatch):
    # Setup fake web folder
    web_folder = tmp_path / 'plots'
    web_folder.mkdir()
    (web_folder / 'file1.txt').write_text('abc')
    (web_folder / 'file2.txt').write_text('def')
    backup_folder = tmp_path / 'backups'
    backup_folder.mkdir()

    # Patch the module variables
    monkeypatch.setattr(backup, 'WEB_FOLDER', web_folder)
    monkeypatch.setattr(backup, 'BACKUP_FOLDER', backup_folder)

    # Call the backup function
    backup.create_backup()
    
    # Check that backup was created
    today = datetime.date.today().strftime('%Y%m%d')
    backup_name = f'backup-{today}.zip'
    backup_path = backup_folder / backup_name

    assert backup_path.exists()
    with zipfile.ZipFile(backup_path, 'r') as z:
        names = z.namelist()
        assert any('file1.txt' in n for n in names)
        assert any('file2.txt' in n for n in names)
    
    # Cleanup: remove the backup file after test
    backup_path.unlink()