def test_or(self):
g = GRSpec(env_vars={"z"}, env_prog=["!z"])
h = self.f | g
assert len(h.env_vars) == 2 and h.env_vars.has_key("z")
assert len(h.env_prog) == len(self.f.env_prog)+1 and "!z" in h.env_prog
# Domain mismatch on system variable y
g.sys_vars = {"y": (0,5)}
nt.assert_raises(ValueError, self.f.__or__, g)
# Domain mismatch on environment variable x
g.sys_vars = dict()
g.env_vars["x"] = (0,3)
nt.assert_raises(ValueError, self.f.__or__, g)
