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"""Provide base classes for the test system"""
from unittest import TestCase
import os
import tempfile

__all__ = ['TestBase', 'FileCreator']


#{ Utilities

class FileCreator:

    """A instance which creates a temporary file with a prefix and a given size
    and provides this info to the user.
    Once it gets deleted, it will remove the temporary file as well."""
    __slots__ = ("_size", "_path")

    def __init__(self, size, prefix=''):
        assert size, "Require size to be larger 0"

        self._path = tempfile.mktemp(prefix=prefix)
        self._size = size

        with open(self._path, "wb") as fp:
            fp.seek(size - 1)
            fp.write(b'1')

        assert os.path.getsize(self.path) == size

    def __del__(self):
        try:
            os.remove(self.path)
        except OSError:
            pass
        # END exception handling

    def __enter__(self):
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        self.__del__()

    @property
    def path(self):
        return self._path

    @property
    def size(self):
        return self._size

#} END utilities


class TestBase(TestCase):

    """Foundation used by all tests"""

    #{ Configuration
    k_window_test_size = 1000 * 1000 * 8 + 5195
    #} END configuration

    #{ Overrides
    @classmethod
    def setUpAll(cls):
        # nothing for now
        pass

    # END overrides

    #{ Interface

    #} END interface