def test_renamedSource(self):
"""
Warnings emitted by a function defined in a file which has been renamed
since it was initially compiled can still be flushed.
This is testing the code which specifically supports working around the
unfortunate behavior of CPython to write a .py source file name into
the .pyc files it generates and then trust that it is correct in
various places. If source files are renamed, .pyc files may not be
regenerated, but they will contain incorrect filenames.
"""
package = FilePath(self.mktemp().encode("utf-8")).child(
b"twisted_private_helper"
)
package.makedirs()
package.child(b"__init__.py").setContent(b"")
package.child(b"module.py").setContent(
b"""
import warnings
def foo():
warnings.warn("oh no")
"""
)
pathEntry = package.parent().path.decode("utf-8")
sys.path.insert(0, pathEntry)
self.addCleanup(sys.path.remove, pathEntry)
# Import it to cause pycs to be generated
from twisted_private_helper import module
# Clean up the state resulting from that import; we're not going to use
# this module, so it should go away.
del sys.modules["twisted_private_helper"]
del sys.modules[module.__name__]
# Some Python versions have extra state related to the just
# imported/renamed package. Clean it up too. See also
# http://bugs.python.org/issue15912
try:
from importlib import invalidate_caches
except ImportError:
pass
else:
invalidate_caches()
# Rename the source directory
package.moveTo(package.sibling(b"twisted_renamed_helper"))
# Import the newly renamed version
from twisted_renamed_helper import module # type: ignore[import]
self.addCleanup(sys.modules.pop, "twisted_renamed_helper")
self.addCleanup(sys.modules.pop, module.__name__)
# Generate the warning
module.foo()
# Flush it
self.assertEqual(len(self.flushWarnings([module.foo])), 1)
def test_renamedSource(self):
"""
Warnings emitted by a function defined in a file which has been renamed
since it was initially compiled can still be flushed.
This is testing the code which specifically supports working around the
unfortunate behavior of CPython to write a .py source file name into
the .pyc files it generates and then trust that it is correct in
various places. If source files are renamed, .pyc files may not be
regenerated, but they will contain incorrect filenames.
"""
package = FilePath(self.mktemp().encode('utf-8')).child(b'twisted_private_helper')
package.makedirs()
package.child(b'__init__.py').setContent(b'')
package.child(b'module.py').setContent(b'''
import warnings
def foo():
warnings.warn("oh no")
''')
pathEntry = package.parent().path.decode('utf-8')
sys.path.insert(0, pathEntry)
self.addCleanup(sys.path.remove, pathEntry)
# Import it to cause pycs to be generated
from twisted_private_helper import module
# Clean up the state resulting from that import; we're not going to use
# this module, so it should go away.
del sys.modules['twisted_private_helper']
del sys.modules[module.__name__]
# Some Python versions have extra state related to the just
# imported/renamed package. Clean it up too. See also
# http://bugs.python.org/issue15912
try:
from importlib import invalidate_caches
except ImportError:
pass
else:
invalidate_caches()
# Rename the source directory
package.moveTo(package.sibling(b'twisted_renamed_helper'))
# Import the newly renamed version
from twisted_renamed_helper import module
self.addCleanup(sys.modules.pop, 'twisted_renamed_helper')
self.addCleanup(sys.modules.pop, module.__name__)
# Generate the warning
module.foo()
# Flush it
self.assertEqual(len(self.flushWarnings([module.foo])), 1)
def test_renamedSource(self):
"""
Warnings emitted by a function defined in a file which has been renamed
since it was initially compiled can still be flushed.
This is testing the code which specifically supports working around the
unfortunate behavior of CPython to write a .py source file name into
the .pyc files it generates and then trust that it is correct in
various places. If source files are renamed, .pyc files may not be
regenerated, but they will contain incorrect filenames.
"""
package = FilePath(self.mktemp()).child('twisted_private_helper')
package.makedirs()
package.child('__init__.py').setContent('')
package.child('module.py').setContent('''
import warnings
def foo():
warnings.warn("oh no")
''')
sys.path.insert(0, package.parent().path)
self.addCleanup(sys.path.remove, package.parent().path)
# Import it to cause pycs to be generated
from twisted_private_helper import module
# Clean up the state resulting from that import; we're not going to use
# this module, so it should go away.
del sys.modules['twisted_private_helper']
del sys.modules[module.__name__]
# Rename the source directory
package.moveTo(package.sibling('twisted_renamed_helper'))
# Import the newly renamed version
from twisted_renamed_helper import module
self.addCleanup(sys.modules.pop, 'twisted_renamed_helper')
self.addCleanup(sys.modules.pop, module.__name__)
# Generate the warning
module.foo()
# Flush it
self.assertEqual(len(self.flushWarnings([module.foo])), 1)