# -*- coding: utf-8; -*-

from unittest import TestCase

from wuttasync import util as mod


class TestDataDiffs(TestCase):

    def test_source_missing_field(self):
        source = {'foo': 'bar'}
        target = {'baz': 'xyz', 'foo': 'bar'}
        self.assertRaises(KeyError, mod.data_diffs, source, target)

    def test_target_missing_field(self):
        source = {'foo': 'bar', 'baz': 'xyz'}
        target = {'baz': 'xyz'}
        self.assertRaises(KeyError, mod.data_diffs, source, target, fields=['foo', 'baz'])

    def test_no_diffs(self):
        source = {'foo': 'bar', 'baz': 'xyz'}
        target = {'baz': 'xyz', 'foo': 'bar'}
        self.assertFalse(mod.data_diffs(source, target))

    def test_with_diffs(self):
        source = {'foo': 'bar', 'baz': 'xyz'}
        target = {'baz': 'xyz', 'foo': 'BAR'}
        result = mod.data_diffs(source, target)
        self.assertEqual(result, ['foo'])