def compare_outputs()

in testsuite/driver/testlib.py [0:0]

• 56 lines of code
• 19 McCabe index (conditional complexity)

def compare_outputs(way, kind, normaliser, expected_file, actual_file, diff_file=None,
                    whitespace_normaliser=lambda x:x):

    expected_path = in_srcdir(expected_file)
    actual_path = in_testdir(actual_file)

    if os.path.exists(expected_path):
        expected_str = normaliser(read_no_crs(expected_path))
        # Create the .normalised file in the testdir, not in the srcdir.
        expected_normalised_file = add_suffix(expected_file, 'normalised')
        expected_normalised_path = in_testdir(expected_normalised_file)
    else:
        expected_str = ''
        expected_normalised_path = '/dev/null'

    actual_raw = read_no_crs(actual_path)
    actual_str = normaliser(actual_raw)

    # See Note [Output comparison].
    if whitespace_normaliser(expected_str) == whitespace_normaliser(actual_str):
        return True
    else:
        if config.verbose >= 1 and _expect_pass(way):
            print('Actual ' + kind + ' output differs from expected:')

        if expected_normalised_path != '/dev/null':
            write_file(expected_normalised_path, expected_str)

        actual_normalised_path = add_suffix(actual_path, 'normalised')
        write_file(actual_normalised_path, actual_str)

        if config.verbose >= 1 and _expect_pass(way):
            # See Note [Output comparison].
            r = runCmd('diff -uw "{0}" "{1}"'.format(expected_normalised_path,
                                                        actual_normalised_path),
                        stdout=diff_file,
                        print_output=True)

            # If for some reason there were no non-whitespace differences,
            # then do a full diff
            if r == 0:
                r = runCmd('diff -u "{0}" "{1}"'.format(expected_normalised_path,
                                                           actual_normalised_path),
                           stdout=diff_file,
                           print_output=True)
        elif diff_file: open(diff_file, 'ab').close() # Make sure the file exists still as
                                            # we will try to read it later

        if config.accept and (getTestOpts().expect == 'fail' or
                              way in getTestOpts().expect_fail_for):
            if_verbose(1, 'Test is expected to fail. Not accepting new output.')
            return False
        elif config.accept and actual_raw:
            if config.accept_platform:
                if_verbose(1, 'Accepting new output for platform "'
                              + config.platform + '".')
                expected_path += '-' + config.platform
            elif config.accept_os:
                if_verbose(1, 'Accepting new output for os "'
                              + config.os + '".')
                expected_path += '-' + config.os
            else:
                if_verbose(1, 'Accepting new output.')

            write_file(expected_path, actual_raw)
            return True
        elif config.accept:
            if_verbose(1, 'No output. Deleting "{0}".'.format(expected_path))
            os.remove(expected_path)
            return True
        else:
            return False