def app(mocked_config, tmpdir_factory):
"""Method to create an app for testing."""
# need to import this late as it might have side effects
from app import app as app_
# need to save old configurations of the app
# to restore them later upon tear down
old_url_map = copy.copy(app_.url_map)
old_view_functions = copy.copy(app_.view_functions)
app_.testing = True
app_.debug = False
old_config = copy.copy(app_.config)
# initialize temp database and yield app
postgresql = Postgresql()
dsn = postgresql.dsn()
# monkey patch database configs
for setting in ['user', 'password', 'port', 'host', 'database']:
mocked_config['database'][setting] = dsn.get(setting, '')
# monkey patch temp dirs
temp_lists = tmpdir_factory.mktemp('lists')
mocked_config['lists']['path'] = str(temp_lists)
temp_uploads = tmpdir_factory.mktemp('uploads')
mocked_config['global']['upload_directory'] = str(temp_uploads)
app_.config['drs_config'] = mocked_config
app_.config['SQLALCHEMY_DATABASE_URI'] = postgresql.url()
app_.config['DRS_UPLOADS'] = str(temp_uploads)
app_.config['DRS_LISTS'] = str(temp_lists)
app_.config['CORE_BASE_URL'] = mocked_config['global']['core_api_v2']
app_.config['DVS_BASE_URL'] = mocked_config['global']['dvs_api_v1']
yield app_
# restore old configs after successful session
app_.url_map = old_url_map
app_.view_functions = old_view_functions
app_.config = old_config
shutil.rmtree(str(temp_lists))
shutil.rmtree(str(temp_uploads))
postgresql.stop()
