import pytest


@pytest.mark.parametrize(
    'value,expected', [
        (None, None),
        ([1, 2, 3], '[1, 2, 3]'),
        ({'a': 1, 'b': 2}, '{"a": 1, "b": 2}'),
        ]
    )
def test_json_encoder_bind(value, expected):
    ''' test encoding json '''
    from ordr.models.meta import JsonEncoder
    encoder = JsonEncoder()
    assert encoder.process_bind_param(value, None) == expected


@pytest.mark.parametrize(
    'value,expected', [
        (None, None),
        ('[1, 2, 3]', [1, 2, 3]),
        ('{"a": 1, "b":2}', {'a': 1, 'b': 2}),
        ]
    )
def test_json_encoder_result(value, expected):
    ''' test decoding json '''
    from ordr.models.meta import JsonEncoder
    encoder = JsonEncoder()
    assert encoder.process_result_value(value, None) == expected


@pytest.mark.parametrize('value', [None, [1, 2, 3], {'a': 1, 'b': 2}])
def test_json_encoder_bind_and_result(value):
    ''' encoding and later decoding json should provide not change value '''
    from ordr.models.meta import JsonEncoder
    encoder = JsonEncoder()
    result = encoder.process_bind_param(value, None)
    assert encoder.process_result_value(result, None) == value