fixed a few mocking/cleanup issues in packaging test_util for win32

Lib/packaging/tests/support.py

@@ -112,26 +112,28 @@ class TempdirManager:
     def setUp(self):
         super(TempdirManager, self).setUp()
         self._basetempdir = tempfile.mkdtemp()
+        self._files = []
 
     def tearDown(self):
         shutil.rmtree(self._basetempdir, os.name in ('nt', 'cygwin'))
+
+        for handle, name in self._files:
+            handle.close()
+            if os.path.exists(name):
+                try:
+                    os.remove(name)
+                except OSError as exc:
+                    if exc.errno != errno.ENOENT:
+                        raise
+
         super(TempdirManager, self).tearDown()
 
     def mktempfile(self):
         """Create a read-write temporary file and return it."""
-
-        def _delete_file(filename):
-            try:
-                os.remove(filename)
-            except OSError as exc:
-                if exc.errno != errno.ENOENT:
-                    raise
-
         fd, fn = tempfile.mkstemp(dir=self._basetempdir)
         os.close(fd)
         fp = open(fn, 'w+')
-        self.addCleanup(fp.close)
-        self.addCleanup(_delete_file, fn)
+        self._files.append((fp, fn))
         return fp
 
     def mkdtemp(self):

Lib/packaging/tests/test_util.py

@@ -63,7 +63,9 @@ class FakePopen:
                  startupinfo=None, creationflags=0,
                  restore_signals=True, start_new_session=False,
                  pass_fds=()):
-        self.cmd = args.split()[0]
+        if isinstance(args, str):
+            args = args.split()
+        self.cmd = args[0]
         exes = self.test_class._exes
         if self.cmd not in exes:
             # we don't want to call the system, returning an empty
@@ -77,6 +79,9 @@ class FakePopen:
     def communicate(self, input=None, timeout=None):
         return self.stdout.read(), self.stderr.read()
 
+    def wait(self, timeout=None):
+        return 0
+
 
 class UtilTestCase(support.EnvironRestorer,
                    support.TempdirManager,
@@ -424,10 +429,8 @@ class UtilTestCase(support.EnvironRestorer,
     @unittest.skipUnless(os.name in ('nt', 'posix'),
                          'runs only under posix or nt')
     def test_spawn(self):
-        # Do not patch subprocess on unix because
-        # packaging.util._spawn_posix uses it
-        if os.name in 'posix':
-            subprocess.Popen = self.old_popen
+        # no patching of Popen here
+        subprocess.Popen = self.old_popen
         tmpdir = self.mkdtemp()
 
         # creating something executable