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import os

from unittest import mock

import pytest

from pre_commit.envcontext import envcontext

from pre_commit.envcontext import UNSET

from pre_commit.envcontext import Var

def _test(*, before, patch, expected):

env = before.copy()

with envcontext(patch, _env=env):

assert env == expected

assert env == before

def test_trivial():

_test(before={}, patch={}, expected={})

def test_noop():

_test(before={'foo': 'bar'}, patch=(), expected={'foo': 'bar'})

def test_adds():

_test(before={}, patch=[('foo', 'bar')], expected={'foo': 'bar'})

def test_overrides():

_test(

before={'foo': 'baz'},

patch=[('foo', 'bar')],

expected={'foo': 'bar'},

)

def test_unset_but_nothing_to_unset():

_test(before={}, patch=[('foo', UNSET)], expected={})

def test_unset_things_to_remove():

_test(

before={'PYTHONHOME': ''},

patch=[('PYTHONHOME', UNSET)],

expected={},

)

def test_templated_environment_variable_missing():

_test(

before={},

patch=[('PATH', ('~/bin:', Var('PATH')))],

expected={'PATH': '~/bin:'},

)

def test_templated_environment_variable_defaults():

_test(

before={},

patch=[('PATH', ('~/bin:', Var('PATH', default='/bin')))],

expected={'PATH': '~/bin:/bin'},

)

def test_templated_environment_variable_there():

_test(

before={'PATH': '/usr/local/bin:/usr/bin'},

patch=[('PATH', ('~/bin:', Var('PATH')))],

expected={'PATH': '~/bin:/usr/local/bin:/usr/bin'},

)

def test_templated_environ_sources_from_previous():

_test(

before={'foo': 'bar'},

patch=(

('foo', 'baz'),

('herp', ('foo: ', Var('foo'))),

expected={'foo': 'baz', 'herp': 'foo: bar'},

)

def test_exception_safety():

class MyError(RuntimeError):

pass

env = {'hello': 'world'}

with pytest.raises(MyError):

with envcontext((('foo', 'bar'),), _env=env):

raise MyError()

assert env == {'hello': 'world'}

def test_integration_os_environ():

with mock.patch.dict(os.environ, {'FOO': 'bar'}, clear=True):

assert os.environ == {'FOO': 'bar'}

with envcontext((('HERP', 'derp'),)):

assert os.environ == {'FOO': 'bar', 'HERP': 'derp'}

assert os.environ == {'FOO': 'bar'}

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