def pyqiodev(self):
"""Fixture providing a PyQIODevice with a QByteArray to test."""
data = QByteArray()
f = QBuffer(data)
qiodev = qtutils.PyQIODevice(f)
yield qiodev
qiodev.close()
def test_write_error_real(self):
"""Test a real write error with /dev/full on supported systems."""
qf = QFile('/dev/full')
qf.open(QIODevice.WriteOnly | QIODevice.Unbuffered)
dev = qtutils.PyQIODevice(qf)
with pytest.raises(OSError, match='No space left on device'):
dev.write(b'foo')
qf.close()
def test_failing_open(self, tmpdir):
"""Test open() which fails (because it's an existent directory)."""
qf = QFile(str(tmpdir))
dev = qtutils.PyQIODevice(qf)
with pytest.raises(qtutils.QtOSError) as excinfo:
dev.open(QIODevice.WriteOnly)
assert excinfo.value.qt_errno == QFileDevice.OpenError
assert dev.closed
def test_qprocess(self, py_proc):
"""Test PyQIODevice with a QProcess which is non-sequential.
This also verifies seek() and tell() behave as expected.
"""
proc = QProcess()
proc.start(*py_proc('print("Hello World")'))
dev = qtutils.PyQIODevice(proc)
assert not dev.closed
with pytest.raises(OSError, match='Random access not allowed!'):
dev.seek(0)
with pytest.raises(OSError, match='Random access not allowed!'):
dev.tell()
proc.waitForFinished(1000)
proc.kill()
assert bytes(dev.read()).rstrip() == b'Hello World'
def test_qprocess(self):
"""Test PyQIODevice with a QProcess which is non-sequential.
This also verifies seek() and tell() behave as expected.
"""
proc = QProcess()
proc.start(sys.executable, ['-c', 'print("Hello World")'])
dev = qtutils.PyQIODevice(proc)
assert not dev.closed
with pytest.raises(OSError) as excinfo:
dev.seek(0)
assert str(excinfo.value) == 'Random access not allowed!'
with pytest.raises(OSError) as excinfo:
dev.tell()
assert str(excinfo.value) == 'Random access not allowed!'
proc.waitForFinished(1000)
proc.kill()
assert bytes(dev.read()).rstrip() == b'Hello World'
def open(self, _fname, mode):
"""Open an in-memory PyQIODevice instead of a real file."""
modes = {
'wb': QIODevice.WriteOnly | QIODevice.Truncate,
'w': QIODevice.WriteOnly | QIODevice.Text | QIODevice.Truncate,
'rb': QIODevice.ReadOnly,
'r': QIODevice.ReadOnly | QIODevice.Text,
}
try:
qt_mode = modes[mode]
except KeyError:
raise ValueError("Invalid mode {}!".format(mode))
f = QBuffer(self._data)
f.open(qt_mode)
qiodev = qtutils.PyQIODevice(f)
# Make sure tests using name/mode don't blow up.
qiodev.name = test_file.TESTFN
qiodev.mode = mode
# Create empty TESTFN file because the Python tests try to unlink
# it.after the test.
open(test_file.TESTFN, 'w', encoding='utf-8').close()
return qiodev
def pyqiodev_failing(self):
"""Fixture providing a PyQIODevice with a FailingQIODevice to test."""
failing = FailingQIODevice()
return qtutils.PyQIODevice(failing)