chromium/third_party/blink/tools/blinkpy/style/checkers/png_unittest.py

# Copyright (C) 2012 Balazs Ankes ([email protected]) University of Szeged
#
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"""Unit test for png.py."""

import unittest

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


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, b"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, b"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_web_tests.py to ensure they have a checksum.'
        ))