def test_default():
con = Context()
res = con.set(a=2)
con.set_default(a=4, b=1)
assert con.b == 1
assert con.a == 2
res.restore()
assert con.a == 4
def test_default():
con = Context()
res = con.set(a=2)
con.set_default(a=4, b=1)
assert con.b == 1
assert con.a == 2
res.restore()
assert con.a == 4
def test_fail():
c3 = Context()
res1 = c3.set(a=1)
res2 = c3.set(b=2)
assert_raises(ContextRestoreError, res1.restore)
assert c3.b == 2
assert c3.a == 1
res2.restore()
res1.restore()
def test_fail():
c3 = Context()
res1 = c3.set(a=1)
res2 = c3.set(b=2)
with pytest.raises(ContextRestoreError):
res1.restore()
assert c3.b == 2
assert c3.a == 1
res2.restore()
res1.restore()
