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"""Unit testing base class for Port implementations."""

import unittest

from webkitpy.port.server_process_mock import MockServerProcess
from webkitpy.port.image_diff import ImageDiffer


class FakePort(object):
    def __init__(self, server_process_output):
        self._server_process_constructor = lambda port, nm, cmd, env: MockServerProcess(lines=server_process_output)

    def _path_to_image_diff(self):
        return ''

    def setup_environ_for_server(self, nm):
        return None


class TestImageDiffer(unittest.TestCase):
    def test_diff_image_failed(self):
        port = FakePort(['diff: 100% failed\n'])
        image_differ = ImageDiffer(port)
        self.assertEqual(image_differ.diff_image('foo', 'bar', 0.1), ('', 100.0, None))

    def test_diff_image_passed(self):
        port = FakePort(['diff: 0% passed\n'])
        image_differ = ImageDiffer(port)
        self.assertEqual(image_differ.diff_image('foo', 'bar', 0.1), (None, 0, None))