def test_apply_sca_with_undo():
env = {'x': '1', 'PATH': os.pathsep.join(['orig', 'paths'])}
e = EnvDelta(scalars={'x': '2', 'y': 'fun/paths'})
env = e.apply(env)
f = EnvDelta(scalars={'x': '3', 'z': 'machine'})
exp = {'x': '3', 'PATH': os.pathsep.join(['orig', 'paths']), 'y': 'fun/paths',
'z': 'machine', _undo_key: repr(f)}
obs = f.apply(env)
assert_equal(exp, obs)
def test_apply_sca():
env = {'x': '1', 'PATH': os.pathsep.join(['orig', 'paths'])}
e = EnvDelta(scalars={'x': '2', 'y': 'fun/paths'})
exp = {'x': '2', 'PATH': os.pathsep.join(['orig', 'paths']), 'y': 'fun/paths',
_undo_key: repr(e)}
obs = e.apply(env)
assert_equal(exp, obs)
