import pytest
xfail = pytest.mark.xfail

@xfail
def test_hello():
    assert 0

@xfail(run=False)
def test_hello2():
    assert 0

@xfail("hasattr(os, 'sep')")
def test_hello3():
    assert 0

@xfail(reason="bug 110")
def test_hello4():
    assert 0

@xfail('pytest.__version__[0] != "17"')
def test_hello5():
    assert 0

def test_hello6():
    pytest.xfail("reason")

@xfail(raises=IndexError)
def test_hello7()
    x = []
    x[1] = 1