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Source code for _pytest.recwarn

""" recording warnings during test function execution. """

import inspect

import _pytest._code
import py
import sys
import warnings
import pytest


@pytest.yield_fixture
def recwarn(request):
    """Return a WarningsRecorder instance that provides these methods:

    * ``pop(category=None)``: return last warning matching the category.
    * ``clear()``: clear list of warnings

    See http://docs.python.org/library/warnings.html for information
    on warning categories.
    """
    wrec = WarningsRecorder()
    with wrec:
        warnings.simplefilter('default')
        yield wrec


def pytest_namespace():
    return {'deprecated_call': deprecated_call,
            'warns': warns}


def deprecated_call(func=None, *args, **kwargs):
    """ assert that calling ``func(*args, **kwargs)`` triggers a
    ``DeprecationWarning`` or ``PendingDeprecationWarning``.

    This function can be used as a context manager::

        >>> with deprecated_call():
        ...    myobject.deprecated_method()

    Note: we cannot use WarningsRecorder here because it is still subject
    to the mechanism that prevents warnings of the same type from being
    triggered twice for the same module. See #1190.
    """
    if not func:
        return WarningsChecker(expected_warning=DeprecationWarning)

    categories = []

    def warn_explicit(message, category, *args, **kwargs):
        categories.append(category)
        old_warn_explicit(message, category, *args, **kwargs)

    def warn(message, category=None, *args, **kwargs):
        if isinstance(message, Warning):
            categories.append(message.__class__)
        else:
            categories.append(category)
        old_warn(message, category, *args, **kwargs)

    old_warn = warnings.warn
    old_warn_explicit = warnings.warn_explicit
    warnings.warn_explicit = warn_explicit
    warnings.warn = warn
    try:
        ret = func(*args, **kwargs)
    finally:
        warnings.warn_explicit = old_warn_explicit
        warnings.warn = old_warn
    deprecation_categories = (DeprecationWarning, PendingDeprecationWarning)
    if not any(issubclass(c, deprecation_categories) for c in categories):
        __tracebackhide__ = True
        raise AssertionError("%r did not produce DeprecationWarning" % (func,))
    return ret


def warns(expected_warning, *args, **kwargs):
    """Assert that code raises a particular class of warning.

    Specifically, the input @expected_warning can be a warning class or
    tuple of warning classes, and the code must return that warning
    (if a single class) or one of those warnings (if a tuple).

    This helper produces a list of ``warnings.WarningMessage`` objects,
    one for each warning raised.

    This function can be used as a context manager, or any of the other ways
    ``pytest.raises`` can be used::

        >>> with warns(RuntimeWarning):
        ...    warnings.warn("my warning", RuntimeWarning)
    """
    wcheck = WarningsChecker(expected_warning)
    if not args:
        return wcheck
    elif isinstance(args[0], str):
        code, = args
        assert isinstance(code, str)
        frame = sys._getframe(1)
        loc = frame.f_locals.copy()
        loc.update(kwargs)

        with wcheck:
            code = _pytest._code.Source(code).compile()
            py.builtin.exec_(code, frame.f_globals, loc)
    else:
        func = args[0]
        with wcheck:
            return func(*args[1:], **kwargs)


class RecordedWarning(object):
    def __init__(self, message, category, filename, lineno, file, line):
        self.message = message
        self.category = category
        self.filename = filename
        self.lineno = lineno
        self.file = file
        self.line = line


[docs]class WarningsRecorder(object): """A context manager to record raised warnings. Adapted from `warnings.catch_warnings`. """ def __init__(self, module=None): self._module = sys.modules['warnings'] if module is None else module self._entered = False self._list = [] @property
[docs] def list(self): """The list of recorded warnings.""" return self._list
def __getitem__(self, i): """Get a recorded warning by index.""" return self._list[i] def __iter__(self): """Iterate through the recorded warnings.""" return iter(self._list) def __len__(self): """The number of recorded warnings.""" return len(self._list)
[docs] def pop(self, cls=Warning): """Pop the first recorded warning, raise exception if not exists.""" for i, w in enumerate(self._list): if issubclass(w.category, cls): return self._list.pop(i) __tracebackhide__ = True raise AssertionError("%r not found in warning list" % cls)
[docs] def clear(self): """Clear the list of recorded warnings.""" self._list[:] = []
def __enter__(self): if self._entered: __tracebackhide__ = True raise RuntimeError("Cannot enter %r twice" % self) self._entered = True self._filters = self._module.filters self._module.filters = self._filters[:] self._showwarning = self._module.showwarning def showwarning(message, category, filename, lineno, file=None, line=None): self._list.append(RecordedWarning( message, category, filename, lineno, file, line)) # still perform old showwarning functionality self._showwarning( message, category, filename, lineno, file=file, line=line) self._module.showwarning = showwarning # allow the same warning to be raised more than once self._module.simplefilter('always') return self def __exit__(self, *exc_info): if not self._entered: __tracebackhide__ = True raise RuntimeError("Cannot exit %r without entering first" % self) self._module.filters = self._filters self._module.showwarning = self._showwarning
class WarningsChecker(WarningsRecorder): def __init__(self, expected_warning=None, module=None): super(WarningsChecker, self).__init__(module=module) msg = ("exceptions must be old-style classes or " "derived from Warning, not %s") if isinstance(expected_warning, tuple): for exc in expected_warning: if not inspect.isclass(exc): raise TypeError(msg % type(exc)) elif inspect.isclass(expected_warning): expected_warning = (expected_warning,) elif expected_warning is not None: raise TypeError(msg % type(expected_warning)) self.expected_warning = expected_warning def __exit__(self, *exc_info): super(WarningsChecker, self).__exit__(*exc_info) # only check if we're not currently handling an exception if all(a is None for a in exc_info): if self.expected_warning is not None: if not any(r.category in self.expected_warning for r in self): __tracebackhide__ = True pytest.fail("DID NOT WARN")