test_ok1/py/test/plugin/pytest_iocapture.py

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import py
class IocapturePlugin:
""" capture sys.stdout/sys.stderr / fd1/fd2. """
def pytest_pyfuncarg_stdcapture(self, pyfuncitem):
capture = Capture(py.io.StdCapture)
pyfuncitem.addfinalizer(capture.finalize)
return capture
def pytest_pyfuncarg_stdcapturefd(self, pyfuncitem):
capture = Capture(py.io.StdCaptureFD)
pyfuncitem.addfinalizer(capture.finalize)
return capture
class Capture:
def __init__(self, captureclass):
self._captureclass = captureclass
self._capture = self._captureclass()
def finalize(self):
self._capture.reset()
def reset(self):
res = self._capture.reset()
self._capture = self._captureclass()
return res
def test_generic(plugintester):
plugintester.apicheck(IocapturePlugin)
class TestCapture:
def test_std_functional(self, testdir):
testdir.plugins.append(IocapturePlugin())
evrec = testdir.inline_runsource("""
def test_hello(stdcapture):
print 42
out, err = stdcapture.reset()
assert out.startswith("42")
""")
ev, = evrec.getnamed("itemtestreport")
assert ev.passed
def test_stdfd_functional(self, testdir):
testdir.plugins.append(IocapturePlugin())
evrec = testdir.inline_runsource("""
def test_hello(stdcapturefd):
import os
os.write(1, "42")
out, err = stdcapturefd.reset()
assert out.startswith("42")
""")
ev, = evrec.getnamed("itemtestreport")
assert ev.passed