src/third_party/blink/Tools/Scripts/webkitpy/style/checkers/png_unittest.py

# Copyright (C) 2012 Balazs Ankes (bank@inf.u-szeged.hu) University of Szeged
#
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"""Unit test for png.py."""

import unittest

from webkitpy.style.checkers.png import PNGChecker
from webkitpy.common.system.filesystem_mock import MockFileSystem
from webkitpy.common.system.system_host_mock import MockSystemHost


class PNGCheckerTest(unittest.TestCase):
    """Tests PNGChecker class."""

    def test_init(self):
        """Test __init__() method."""

        def mock_handle_style_error(self):
            pass

        checker = PNGChecker("test/config", mock_handle_style_error, MockSystemHost())
        self.assertEqual(checker._file_path, "test/config")
        self.assertEqual(checker._handle_style_error, mock_handle_style_error)

    def test_check(self):
        errors = []

        def mock_handle_style_error(line_number, category, confidence, message):
            error = (line_number, category, confidence, message)
            errors.append(error)

        fs = MockFileSystem()

        file_path = "foo.png"
        fs.write_binary_file(file_path, "Dummy binary data")
        errors = []
        checker = PNGChecker(file_path, mock_handle_style_error, MockSystemHost(os_name='linux', filesystem=fs))
        checker.check()
        self.assertEqual(len(errors), 0)

        file_path = "foo-expected.png"
        fs.write_binary_file(file_path, "Dummy binary data")
        errors = []
        checker = PNGChecker(file_path, mock_handle_style_error, MockSystemHost(os_name='linux', filesystem=fs))
        checker.check()
        self.assertEqual(len(errors), 1)
        self.assertEqual(
            errors[0],
            (0, 'image/png', 5, 'Image lacks a checksum. Generate pngs using run-webkit-tests to ensure they have a checksum.'))