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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2017-20 Richard Hull and contributors
# See LICENSE.rst for details.
"""
Tests for the :py:mod:`luma.core.util` module.
"""
from luma.core import util
from helpers import get_reference_file
test_config_file = get_reference_file('config-test.txt')
def test_mutablestring():
f = util.mutable_string('bar')
f[1] = '2'
assert f == 'b2r'
assert repr(f) == repr('b2r')
assert len(f) == 3
assert hash(f) is not None
def test_mutablestring_unicode():
f = util.mutable_string(u'bazül')
f[4] = 'L'
assert f == u'baz\xfcL'
assert repr(f) == repr(u'baz\xfcL')
assert len(f) == 5
def test_from_16_to_8_to_16():
"""
Test the conversion from 16 bit to 8 bit values and back. Ensure that conversion
from 8 to 16 bit takes into account whether the 16 bit value is negative or
positive
"""
data = [1, 2, 3, 2**15, 2**16 - 1]
expect = [0, 1, 0, 2, 0, 3, 0x80, 0, 0xFF, 0xFF]
result = util.from_16_to_8(data)
assert result == expect
expect = [1, 2, 3, -32768, -1]
result = util.from_8_to_16(result)
assert result == expect
def test_bytes_to_nibbles():
"""
Test the conversion from 8 bit values into 4 bit (nibbles)
"""
data = [0, 1, 2, 3, 0xFF, 0x7F]
expect = [0, 0, 0, 1, 0, 2, 0, 3, 15, 15, 7, 15]
result = util.bytes_to_nibbles(data)
assert result == expect
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