445 lines
17 KiB
Python
445 lines
17 KiB
Python
import warnings
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from typing import Optional
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import pytest
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from _pytest.pytester import Pytester
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from _pytest.recwarn import WarningsRecorder
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def test_recwarn_stacklevel(recwarn: WarningsRecorder) -> None:
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warnings.warn("hello")
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warn = recwarn.pop()
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assert warn.filename == __file__
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def test_recwarn_functional(pytester: Pytester) -> None:
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pytester.makepyfile(
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"""
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import warnings
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def test_method(recwarn):
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warnings.warn("hello")
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warn = recwarn.pop()
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assert isinstance(warn.message, UserWarning)
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"""
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)
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reprec = pytester.inline_run()
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reprec.assertoutcome(passed=1)
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@pytest.mark.filterwarnings("")
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def test_recwarn_captures_deprecation_warning(recwarn: WarningsRecorder) -> None:
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"""
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Check that recwarn can capture DeprecationWarning by default
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without custom filterwarnings (see #8666).
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"""
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warnings.warn(DeprecationWarning("some deprecation"))
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assert len(recwarn) == 1
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assert recwarn.pop(DeprecationWarning)
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class TestWarningsRecorderChecker:
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def test_recording(self) -> None:
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rec = WarningsRecorder(_ispytest=True)
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with rec:
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assert not rec.list
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warnings.warn_explicit("hello", UserWarning, "xyz", 13)
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assert len(rec.list) == 1
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warnings.warn(DeprecationWarning("hello"))
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assert len(rec.list) == 2
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warn = rec.pop()
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assert str(warn.message) == "hello"
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values = rec.list
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rec.clear()
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assert len(rec.list) == 0
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assert values is rec.list
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pytest.raises(AssertionError, rec.pop)
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def test_warn_stacklevel(self) -> None:
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"""#4243"""
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rec = WarningsRecorder(_ispytest=True)
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with rec:
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warnings.warn("test", DeprecationWarning, 2)
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def test_typechecking(self) -> None:
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from _pytest.recwarn import WarningsChecker
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with pytest.raises(TypeError):
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WarningsChecker(5, _ispytest=True) # type: ignore[arg-type]
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with pytest.raises(TypeError):
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WarningsChecker(("hi", RuntimeWarning), _ispytest=True) # type: ignore[arg-type]
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with pytest.raises(TypeError):
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WarningsChecker([DeprecationWarning, RuntimeWarning], _ispytest=True) # type: ignore[arg-type]
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def test_invalid_enter_exit(self) -> None:
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# wrap this test in WarningsRecorder to ensure warning state gets reset
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with WarningsRecorder(_ispytest=True):
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with pytest.raises(RuntimeError):
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rec = WarningsRecorder(_ispytest=True)
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rec.__exit__(None, None, None) # can't exit before entering
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with pytest.raises(RuntimeError):
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rec = WarningsRecorder(_ispytest=True)
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with rec:
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with rec:
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pass # can't enter twice
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class TestDeprecatedCall:
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"""test pytest.deprecated_call()"""
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def dep(self, i: int, j: Optional[int] = None) -> int:
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if i == 0:
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warnings.warn("is deprecated", DeprecationWarning, stacklevel=1)
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return 42
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def dep_explicit(self, i: int) -> None:
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if i == 0:
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warnings.warn_explicit(
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"dep_explicit", category=DeprecationWarning, filename="hello", lineno=3
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)
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def test_deprecated_call_raises(self) -> None:
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with pytest.raises(pytest.fail.Exception, match="No warnings of type"):
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pytest.deprecated_call(self.dep, 3, 5)
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def test_deprecated_call(self) -> None:
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pytest.deprecated_call(self.dep, 0, 5)
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def test_deprecated_call_ret(self) -> None:
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ret = pytest.deprecated_call(self.dep, 0)
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assert ret == 42
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def test_deprecated_call_preserves(self) -> None:
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# Type ignored because `onceregistry` and `filters` are not
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# documented API.
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onceregistry = warnings.onceregistry.copy() # type: ignore
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filters = warnings.filters[:]
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warn = warnings.warn
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warn_explicit = warnings.warn_explicit
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self.test_deprecated_call_raises()
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self.test_deprecated_call()
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assert onceregistry == warnings.onceregistry # type: ignore
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assert filters == warnings.filters
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assert warn is warnings.warn
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assert warn_explicit is warnings.warn_explicit
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def test_deprecated_explicit_call_raises(self) -> None:
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with pytest.raises(pytest.fail.Exception):
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pytest.deprecated_call(self.dep_explicit, 3)
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def test_deprecated_explicit_call(self) -> None:
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pytest.deprecated_call(self.dep_explicit, 0)
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pytest.deprecated_call(self.dep_explicit, 0)
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@pytest.mark.parametrize("mode", ["context_manager", "call"])
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def test_deprecated_call_no_warning(self, mode) -> None:
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"""Ensure deprecated_call() raises the expected failure when its block/function does
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not raise a deprecation warning.
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"""
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def f():
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pass
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msg = "No warnings of type (.*DeprecationWarning.*, .*PendingDeprecationWarning.*)"
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with pytest.raises(pytest.fail.Exception, match=msg):
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if mode == "call":
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pytest.deprecated_call(f)
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else:
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with pytest.deprecated_call():
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f()
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@pytest.mark.parametrize(
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"warning_type", [PendingDeprecationWarning, DeprecationWarning]
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)
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@pytest.mark.parametrize("mode", ["context_manager", "call"])
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@pytest.mark.parametrize("call_f_first", [True, False])
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@pytest.mark.filterwarnings("ignore")
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def test_deprecated_call_modes(self, warning_type, mode, call_f_first) -> None:
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"""Ensure deprecated_call() captures a deprecation warning as expected inside its
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block/function.
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"""
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def f():
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warnings.warn(warning_type("hi"))
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return 10
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# ensure deprecated_call() can capture the warning even if it has already been triggered
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if call_f_first:
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assert f() == 10
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if mode == "call":
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assert pytest.deprecated_call(f) == 10
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else:
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with pytest.deprecated_call():
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assert f() == 10
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def test_deprecated_call_specificity(self) -> None:
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other_warnings = [
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Warning,
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UserWarning,
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SyntaxWarning,
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RuntimeWarning,
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FutureWarning,
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ImportWarning,
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UnicodeWarning,
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]
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for warning in other_warnings:
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def f():
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warnings.warn(warning("hi"))
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with pytest.warns(warning):
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with pytest.raises(pytest.fail.Exception):
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pytest.deprecated_call(f)
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with pytest.raises(pytest.fail.Exception):
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with pytest.deprecated_call():
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f()
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def test_deprecated_call_supports_match(self) -> None:
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with pytest.deprecated_call(match=r"must be \d+$"):
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warnings.warn("value must be 42", DeprecationWarning)
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with pytest.deprecated_call():
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with pytest.raises(pytest.fail.Exception, match="DID NOT WARN"):
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with pytest.deprecated_call(match=r"must be \d+$"):
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warnings.warn("this is not here", DeprecationWarning)
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class TestWarns:
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def test_check_callable(self) -> None:
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source = "warnings.warn('w1', RuntimeWarning)"
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with pytest.raises(TypeError, match=r".* must be callable"):
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pytest.warns(RuntimeWarning, source) # type: ignore
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def test_several_messages(self) -> None:
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# different messages, b/c Python suppresses multiple identical warnings
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pytest.warns(RuntimeWarning, lambda: warnings.warn("w1", RuntimeWarning))
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with pytest.warns(RuntimeWarning):
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with pytest.raises(pytest.fail.Exception):
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pytest.warns(UserWarning, lambda: warnings.warn("w2", RuntimeWarning))
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pytest.warns(RuntimeWarning, lambda: warnings.warn("w3", RuntimeWarning))
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def test_function(self) -> None:
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pytest.warns(
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SyntaxWarning, lambda msg: warnings.warn(msg, SyntaxWarning), "syntax"
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)
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def test_warning_tuple(self) -> None:
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pytest.warns(
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(RuntimeWarning, SyntaxWarning), lambda: warnings.warn("w1", RuntimeWarning)
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)
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pytest.warns(
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(RuntimeWarning, SyntaxWarning), lambda: warnings.warn("w2", SyntaxWarning)
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)
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with pytest.warns():
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pytest.raises(
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pytest.fail.Exception,
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lambda: pytest.warns(
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(RuntimeWarning, SyntaxWarning),
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lambda: warnings.warn("w3", UserWarning),
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),
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)
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def test_as_contextmanager(self) -> None:
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with pytest.warns(RuntimeWarning):
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warnings.warn("runtime", RuntimeWarning)
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with pytest.warns(UserWarning):
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warnings.warn("user", UserWarning)
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with pytest.warns():
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with pytest.raises(pytest.fail.Exception) as excinfo:
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with pytest.warns(RuntimeWarning):
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warnings.warn("user", UserWarning)
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excinfo.match(
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r"DID NOT WARN. No warnings of type \(.+RuntimeWarning.+,\) were emitted.\n"
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r" Emitted warnings: \[UserWarning\('user',?\)\]."
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)
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with pytest.warns():
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with pytest.raises(pytest.fail.Exception) as excinfo:
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with pytest.warns(UserWarning):
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warnings.warn("runtime", RuntimeWarning)
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excinfo.match(
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r"DID NOT WARN. No warnings of type \(.+UserWarning.+,\) were emitted.\n"
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r" Emitted warnings: \[RuntimeWarning\('runtime',?\)]."
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)
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with pytest.raises(pytest.fail.Exception) as excinfo:
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with pytest.warns(UserWarning):
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pass
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excinfo.match(
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r"DID NOT WARN. No warnings of type \(.+UserWarning.+,\) were emitted.\n"
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r" Emitted warnings: \[\]."
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)
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warning_classes = (UserWarning, FutureWarning)
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with pytest.warns():
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with pytest.raises(pytest.fail.Exception) as excinfo:
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with pytest.warns(warning_classes) as warninfo:
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warnings.warn("runtime", RuntimeWarning)
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warnings.warn("import", ImportWarning)
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messages = [each.message for each in warninfo]
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expected_str = (
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f"DID NOT WARN. No warnings of type {warning_classes} were emitted.\n"
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f" Emitted warnings: {messages}."
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)
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assert str(excinfo.value) == expected_str
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def test_record(self) -> None:
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with pytest.warns(UserWarning) as record:
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warnings.warn("user", UserWarning)
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assert len(record) == 1
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assert str(record[0].message) == "user"
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def test_record_only(self) -> None:
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with pytest.warns() as record:
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warnings.warn("user", UserWarning)
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warnings.warn("runtime", RuntimeWarning)
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assert len(record) == 2
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assert str(record[0].message) == "user"
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assert str(record[1].message) == "runtime"
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def test_record_only_none_deprecated_warn(self) -> None:
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# This should become an error when WARNS_NONE_ARG is removed in Pytest 8.0
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with warnings.catch_warnings():
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warnings.simplefilter("ignore")
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with pytest.warns(None) as record: # type: ignore[call-overload]
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warnings.warn("user", UserWarning)
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warnings.warn("runtime", RuntimeWarning)
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assert len(record) == 2
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assert str(record[0].message) == "user"
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assert str(record[1].message) == "runtime"
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def test_record_by_subclass(self) -> None:
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with pytest.warns(Warning) as record:
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warnings.warn("user", UserWarning)
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warnings.warn("runtime", RuntimeWarning)
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assert len(record) == 2
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assert str(record[0].message) == "user"
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assert str(record[1].message) == "runtime"
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class MyUserWarning(UserWarning):
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pass
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class MyRuntimeWarning(RuntimeWarning):
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pass
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with pytest.warns((UserWarning, RuntimeWarning)) as record:
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warnings.warn("user", MyUserWarning)
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warnings.warn("runtime", MyRuntimeWarning)
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assert len(record) == 2
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assert str(record[0].message) == "user"
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assert str(record[1].message) == "runtime"
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def test_double_test(self, pytester: Pytester) -> None:
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"""If a test is run again, the warning should still be raised"""
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pytester.makepyfile(
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"""
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import pytest
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import warnings
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@pytest.mark.parametrize('run', [1, 2])
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def test(run):
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with pytest.warns(RuntimeWarning):
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warnings.warn("runtime", RuntimeWarning)
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"""
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)
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result = pytester.runpytest()
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result.stdout.fnmatch_lines(["*2 passed in*"])
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def test_match_regex(self) -> None:
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with pytest.warns(UserWarning, match=r"must be \d+$"):
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warnings.warn("value must be 42", UserWarning)
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with pytest.warns():
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with pytest.raises(pytest.fail.Exception):
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with pytest.warns(UserWarning, match=r"must be \d+$"):
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warnings.warn("this is not here", UserWarning)
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with pytest.warns():
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with pytest.raises(pytest.fail.Exception):
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with pytest.warns(FutureWarning, match=r"must be \d+$"):
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warnings.warn("value must be 42", UserWarning)
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def test_one_from_multiple_warns(self) -> None:
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with pytest.warns():
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with pytest.raises(pytest.fail.Exception, match="DID NOT WARN"):
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with pytest.warns(UserWarning, match=r"aaa"):
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with pytest.warns(UserWarning, match=r"aaa"):
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warnings.warn("cccccccccc", UserWarning)
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warnings.warn("bbbbbbbbbb", UserWarning)
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warnings.warn("aaaaaaaaaa", UserWarning)
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def test_none_of_multiple_warns(self) -> None:
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with pytest.warns():
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with pytest.raises(pytest.fail.Exception, match="DID NOT WARN"):
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with pytest.warns(UserWarning, match=r"aaa"):
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warnings.warn("bbbbbbbbbb", UserWarning)
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warnings.warn("cccccccccc", UserWarning)
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@pytest.mark.filterwarnings("ignore")
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def test_can_capture_previously_warned(self) -> None:
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def f() -> int:
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warnings.warn(UserWarning("ohai"))
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return 10
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assert f() == 10
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assert pytest.warns(UserWarning, f) == 10
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assert pytest.warns(UserWarning, f) == 10
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assert pytest.warns(UserWarning, f) != "10" # type: ignore[comparison-overlap]
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def test_warns_context_manager_with_kwargs(self) -> None:
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with pytest.raises(TypeError) as excinfo:
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with pytest.warns(UserWarning, foo="bar"): # type: ignore
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pass
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assert "Unexpected keyword arguments" in str(excinfo.value)
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def test_re_emit_single(self) -> None:
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with pytest.warns(DeprecationWarning):
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with pytest.warns(UserWarning):
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warnings.warn("user warning", UserWarning)
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warnings.warn("some deprecation warning", DeprecationWarning)
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def test_re_emit_multiple(self) -> None:
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with pytest.warns(UserWarning):
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warnings.warn("first warning", UserWarning)
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warnings.warn("second warning", UserWarning)
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def test_re_emit_match_single(self) -> None:
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with pytest.warns(DeprecationWarning):
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with pytest.warns(UserWarning, match="user warning"):
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warnings.warn("user warning", UserWarning)
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warnings.warn("some deprecation warning", DeprecationWarning)
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def test_re_emit_match_multiple(self) -> None:
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with warnings.catch_warnings():
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warnings.simplefilter("error") # if anything is re-emitted
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with pytest.warns(UserWarning, match="user warning"):
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warnings.warn("first user warning", UserWarning)
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warnings.warn("second user warning", UserWarning)
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def test_re_emit_non_match_single(self) -> None:
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with pytest.warns(UserWarning, match="v2 warning"):
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with pytest.warns(UserWarning, match="v1 warning"):
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warnings.warn("v1 warning", UserWarning)
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warnings.warn("non-matching v2 warning", UserWarning)
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def test_catch_warning_within_raise(self) -> None:
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# warns-in-raises works since https://github.com/pytest-dev/pytest/pull/11129
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with pytest.raises(ValueError, match="some exception"):
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with pytest.warns(FutureWarning, match="some warning"):
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warnings.warn("some warning", category=FutureWarning)
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raise ValueError("some exception")
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# and raises-in-warns has always worked but we'll check for symmetry.
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with pytest.warns(FutureWarning, match="some warning"):
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with pytest.raises(ValueError, match="some exception"):
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warnings.warn("some warning", category=FutureWarning)
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raise ValueError("some exception")
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