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How to use ensure_topdir method in pytest-cov

Best Python code snippet using pytest-cov

engine.py

Source:engine.py

...23        setattr(obj, attr, copy.copy(backup))24        yield25    finally:26        setattr(obj, attr, backup)27def _ensure_topdir(meth):28    @functools.wraps(meth)29    def ensure_topdir_wrapper(self, *args, **kwargs):30        try:31            original_cwd = os.getcwd()32        except OSError:33            # Looks like it's gone, this is non-ideal because a side-effect will34            # be introduced in the tests here but we can't do anything about it.35            original_cwd = None36        os.chdir(self.topdir)37        try:38            return meth(self, *args, **kwargs)39        finally:40            if original_cwd is not None:41                os.chdir(original_cwd)42    return ensure_topdir_wrapper43class CovController(object):44    """Base class for different plugin implementations."""45    def __init__(self, cov_source, cov_report, cov_config, cov_append, cov_branch, config=None, nodeid=None):46        """Get some common config used by multiple derived classes."""47        self.cov_source = cov_source48        self.cov_report = cov_report49        self.cov_config = cov_config50        self.cov_append = cov_append51        self.cov_branch = cov_branch52        self.config = config53        self.nodeid = nodeid54        self.cov = None55        self.combining_cov = None56        self.data_file = None57        self.node_descs = set()58        self.failed_workers = []59        self.topdir = os.getcwd()60        self.is_collocated = None61    @contextlib.contextmanager62    def ensure_topdir(self):63        original_cwd = os.getcwd()64        os.chdir(self.topdir)65        yield66        os.chdir(original_cwd)67    @_ensure_topdir68    def pause(self):69        self.cov.stop()70        self.unset_env()71    @_ensure_topdir72    def resume(self):73        self.cov.start()74        self.set_env()75    @_ensure_topdir76    def set_env(self):...

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