tests: pep517: revert changes

Author: xoviat

setuptools/tests/test_pep517.py

@@ -49,18 +49,16 @@ def __call__(self, name, *args, **kw):
 
 @contextmanager
 def enter_directory(dir, val=None):
- while True:
- original_dir = os.getcwd()
- os.chdir(dir)
- yield val
- os.chdir(original_dir)
+ original_dir = os.getcwd()
+ os.chdir(dir)
+ yield val
+ os.chdir(original_dir)
 
 
 @pytest.fixture
 def build_backend():
  tmpdir = mkdtemp()
- ctx = enter_directory(tmpdir, BuildBackend(cwd='.'))
- with ctx:
+ with enter_directory(tmpdir):
  setup_script = DALS("""
  from setuptools import setup
 
@@ -81,7 +79,7 @@ def run():
  """)
  })
 
- return ctx
+ return enter_directory(tmpdir, BuildBackend(cwd='.'))
 
 
 def test_get_requires_for_build_wheel(build_backend):