from charts.utils import dict
import pytest


def test_safe_dict_update_error():
    """Test updating a dict fails on shared keys with different values."""
    with pytest.raises(Exception, match='Attempted to update dict with mismatched value.'):
        dict.safe_dict_update({'a': 1}, {'a': 2})


def test_safe_dict_update_same_key_value():
    """Test updating a dict with a shared key and value."""

    target = {
        'key': 'value'
    }
    dict.safe_dict_update(
        target,
        {
            'key': 'value',
        },
    )

    assert target == {
        'key': 'value',
    }


def test_safe_dict_update_new_keys():
    """Test updating a dict with new keys."""

    target = {
        'key': 'value'
    }
    dict.safe_dict_update(
        target,
        {
            'key2': 'value2',
        },
    )

    assert target == {
        'key': 'value',
        'key2': 'value2',
    }