"""Test format error."""

import json

from moneyhub.utils.format_error import validation_error


def test_validation_error():
    """Test validation_error."""
    error_message = 'An entity already exists.'

    result = validation_error(error_message)
    response = json.loads(result.body)

    assert result.status_code == 400
    assert response['message'] == error_message