bpo-39390 shutil: fix argument types for ignore callback (GH-18122)

1 files changed, 42 insertions, 0 deletions

diff --git a/Lib/test/test_shutil.py b/Lib/test/test_shutil.py
index 460b979ba9..076c450e09 100644
--- a/Lib/test/test_shutil.py
+++ b/Lib/test/test_shutil.py
@@ -579,6 +579,48 @@ class TestCopyTree(BaseTest, unittest.TestCase):
             shutil.rmtree(src_dir)
             shutil.rmtree(os.path.dirname(dst_dir))
 
+    def test_copytree_arg_types_of_ignore(self):
+        join = os.path.join
+        exists = os.path.exists
+
+        tmp_dir = self.mkdtemp()
+        src_dir = join(tmp_dir, "source")
+
+        os.mkdir(join(src_dir))
+        os.mkdir(join(src_dir, 'test_dir'))
+        os.mkdir(os.path.join(src_dir, 'test_dir', 'subdir'))
+        write_file((src_dir, 'test_dir', 'subdir', 'test.txt'), '456')
+
+        invokations = []
+
+        def _ignore(src, names):
+            invokations.append(src)
+            self.assertIsInstance(src, str)
+            self.assertIsInstance(names, list)
+            self.assertEqual(len(names), len(set(names)))
+            for name in names:
+                self.assertIsInstance(name, str)
+            return []
+
+        dst_dir = join(self.mkdtemp(), 'destination')
+        shutil.copytree(src_dir, dst_dir, ignore=_ignore)
+        self.assertTrue(exists(join(dst_dir, 'test_dir', 'subdir',
+                                    'test.txt')))
+
+        dst_dir = join(self.mkdtemp(), 'destination')
+        shutil.copytree(pathlib.Path(src_dir), dst_dir, ignore=_ignore)
+        self.assertTrue(exists(join(dst_dir, 'test_dir', 'subdir',
+                                    'test.txt')))
+
+        dst_dir = join(self.mkdtemp(), 'destination')
+        src_dir_entry = list(os.scandir(tmp_dir))[0]
+        self.assertIsInstance(src_dir_entry, os.DirEntry)
+        shutil.copytree(src_dir_entry, dst_dir, ignore=_ignore)
+        self.assertTrue(exists(join(dst_dir, 'test_dir', 'subdir',
+                                    'test.txt')))
+
+        self.assertEqual(len(invokations), 9)
+
     def test_copytree_retains_permissions(self):
         tmp_dir = self.mkdtemp()
         src_dir = os.path.join(tmp_dir, 'source')