import unittest
from channel_context import load_channels

class ChannelContextTests(unittest.TestCase):
    def test_no_implicit_default_or_permission(self):
        value = load_channels()
        self.assertIsNone(value['selected_channel'])
        self.assertFalse(value['authority_granted'])
        self.assertEqual(len(value['channels']), 5)

    def test_every_explicit_private_channel_resolves(self):
        for id in ['ICE-CH-HB001', 'ICE-CH-LB001', 'ICE-CH-ZC001', 'ICE-CH-DK001']:
            self.assertEqual(load_channels(id)['selected_channel']['id'], id)

    def test_public_and_unknown_not_silently_routed_private(self):
        for id in ['CH-ZERO-CORE-LPM', 'not-a-channel']:
            with self.assertRaisesRegex(ValueError, 'UNKNOWN_PRIVATE_CHANNEL'):
                load_channels(id)

if __name__ == '__main__': unittest.main()