test_ok2/testing/test_recwarn.py

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import warnings
import py
import pytest
from _pytest.recwarn import WarningsRecorder
def test_recwarn_functional(testdir):
reprec = testdir.inline_runsource("""
import warnings
oldwarn = warnings.showwarning
def test_method(recwarn):
assert warnings.showwarning != oldwarn
warnings.warn("hello")
warn = recwarn.pop()
assert isinstance(warn.message, UserWarning)
def test_finalized():
assert warnings.showwarning == oldwarn
""")
res = reprec.countoutcomes()
assert tuple(res) == (2, 0, 0), res
class TestWarningsRecorderChecker(object):
def test_recording(self, recwarn):
showwarning = py.std.warnings.showwarning
rec = WarningsRecorder()
with rec:
assert py.std.warnings.showwarning != showwarning
assert not rec.list
py.std.warnings.warn_explicit("hello", UserWarning, "xyz", 13)
assert len(rec.list) == 1
py.std.warnings.warn(DeprecationWarning("hello"))
assert len(rec.list) == 2
warn = rec.pop()
assert str(warn.message) == "hello"
l = rec.list
rec.clear()
assert len(rec.list) == 0
assert l is rec.list
pytest.raises(AssertionError, "rec.pop()")
assert showwarning == py.std.warnings.showwarning
def test_typechecking(self):
from _pytest.recwarn import WarningsChecker
with pytest.raises(TypeError):
WarningsChecker(5)
with pytest.raises(TypeError):
WarningsChecker(('hi', RuntimeWarning))
with pytest.raises(TypeError):
WarningsChecker([DeprecationWarning, RuntimeWarning])
def test_invalid_enter_exit(self):
# wrap this test in WarningsRecorder to ensure warning state gets reset
with WarningsRecorder():
with pytest.raises(RuntimeError):
rec = WarningsRecorder()
rec.__exit__(None, None, None) # can't exit before entering
with pytest.raises(RuntimeError):
rec = WarningsRecorder()
with rec:
with rec:
pass # can't enter twice
class TestDeprecatedCall(object):
"""test pytest.deprecated_call()"""
def dep(self, i, j=None):
if i == 0:
py.std.warnings.warn("is deprecated", DeprecationWarning,
stacklevel=1)
return 42
def dep_explicit(self, i):
if i == 0:
py.std.warnings.warn_explicit("dep_explicit", category=DeprecationWarning,
filename="hello", lineno=3)
def test_deprecated_call_raises(self):
with pytest.raises(AssertionError) as excinfo:
pytest.deprecated_call(self.dep, 3, 5)
assert str(excinfo).find("did not produce") != -1
def test_deprecated_call(self):
pytest.deprecated_call(self.dep, 0, 5)
def test_deprecated_call_ret(self):
ret = pytest.deprecated_call(self.dep, 0)
assert ret == 42
def test_deprecated_call_preserves(self):
onceregistry = py.std.warnings.onceregistry.copy()
filters = py.std.warnings.filters[:]
warn = py.std.warnings.warn
warn_explicit = py.std.warnings.warn_explicit
self.test_deprecated_call_raises()
self.test_deprecated_call()
assert onceregistry == py.std.warnings.onceregistry
assert filters == py.std.warnings.filters
assert warn is py.std.warnings.warn
assert warn_explicit is py.std.warnings.warn_explicit
def test_deprecated_explicit_call_raises(self):
with pytest.raises(AssertionError):
pytest.deprecated_call(self.dep_explicit, 3)
def test_deprecated_explicit_call(self):
pytest.deprecated_call(self.dep_explicit, 0)
pytest.deprecated_call(self.dep_explicit, 0)
def test_deprecated_call_as_context_manager_no_warning(self):
with pytest.raises(pytest.fail.Exception) as ex:
with pytest.deprecated_call():
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self.dep(1)
assert str(ex.value) == "DID NOT WARN"
def test_deprecated_call_as_context_manager(self):
with pytest.deprecated_call():
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self.dep(0)
def test_deprecated_call_pending(self):
def f():
py.std.warnings.warn(PendingDeprecationWarning("hi"))
pytest.deprecated_call(f)
def test_deprecated_call_specificity(self):
other_warnings = [Warning, UserWarning, SyntaxWarning, RuntimeWarning,
FutureWarning, ImportWarning, UnicodeWarning]
for warning in other_warnings:
def f():
py.std.warnings.warn(warning("hi"))
with pytest.raises(AssertionError):
pytest.deprecated_call(f)
def test_deprecated_function_already_called(self, testdir):
"""deprecated_call should be able to catch a call to a deprecated
function even if that function has already been called in the same
module. See #1190.
"""
testdir.makepyfile("""
import warnings
import pytest
def deprecated_function():
warnings.warn("deprecated", DeprecationWarning)
def test_one():
deprecated_function()
def test_two():
pytest.deprecated_call(deprecated_function)
""")
result = testdir.runpytest()
result.stdout.fnmatch_lines('*=== 2 passed in *===')
class TestWarns(object):
def test_strings(self):
# different messages, b/c Python suppresses multiple identical warnings
source1 = "warnings.warn('w1', RuntimeWarning)"
source2 = "warnings.warn('w2', RuntimeWarning)"
source3 = "warnings.warn('w3', RuntimeWarning)"
pytest.warns(RuntimeWarning, source1)
pytest.raises(pytest.fail.Exception,
lambda: pytest.warns(UserWarning, source2))
pytest.warns(RuntimeWarning, source3)
def test_function(self):
pytest.warns(SyntaxWarning,
lambda msg: warnings.warn(msg, SyntaxWarning), "syntax")
def test_warning_tuple(self):
pytest.warns((RuntimeWarning, SyntaxWarning),
lambda: warnings.warn('w1', RuntimeWarning))
pytest.warns((RuntimeWarning, SyntaxWarning),
lambda: warnings.warn('w2', SyntaxWarning))
pytest.raises(pytest.fail.Exception,
lambda: pytest.warns(
(RuntimeWarning, SyntaxWarning),
lambda: warnings.warn('w3', UserWarning)))
def test_as_contextmanager(self):
with pytest.warns(RuntimeWarning):
warnings.warn("runtime", RuntimeWarning)
with pytest.raises(pytest.fail.Exception):
with pytest.warns(RuntimeWarning):
warnings.warn("user", UserWarning)
with pytest.raises(pytest.fail.Exception):
with pytest.warns(UserWarning):
warnings.warn("runtime", RuntimeWarning)
with pytest.warns(UserWarning):
warnings.warn("user", UserWarning)
def test_record(self):
with pytest.warns(UserWarning) as record:
warnings.warn("user", UserWarning)
assert len(record) == 1
assert str(record[0].message) == "user"
def test_record_only(self):
with pytest.warns(None) as record:
warnings.warn("user", UserWarning)
warnings.warn("runtime", RuntimeWarning)
assert len(record) == 2
assert str(record[0].message) == "user"
assert str(record[1].message) == "runtime"
def test_double_test(self, testdir):
"""If a test is run again, the warning should still be raised"""
testdir.makepyfile('''
import pytest
import warnings
@pytest.mark.parametrize('run', [1, 2])
def test(run):
with pytest.warns(RuntimeWarning):
warnings.warn("runtime", RuntimeWarning)
''')
result = testdir.runpytest()
result.stdout.fnmatch_lines(['*2 passed in*'])