bpo-39022, bpo-38594: Sync with importlib_metadata 1.3 (GH-17568)

* bpo-39022, bpo-38594: Sync with importlib_metadata 1.3 including improved docs for custom finders and better serialization support in EntryPoints.

* 📜🤖 Added by blurb_it.

* Correct module reference

1 files changed, 33 insertions, 0 deletions

diff --git a/Lib/test/test_importlib/test_main.py b/Lib/test/test_importlib/test_main.py
index 4d5b127..c5f1dbb 100644
--- a/Lib/test/test_importlib/test_main.py
+++ b/Lib/test/test_importlib/test_main.py
@@ -1,6 +1,8 @@
 # coding: utf-8
 
 import re
+import json
+import pickle
 import textwrap
 import unittest
 import importlib.metadata
@@ -181,3 +183,34 @@ class DirectoryTest(fixtures.OnSysPath, fixtures.SiteDir, unittest.TestCase):
         with self.add_sys_path(egg):
             with self.assertRaises(PackageNotFoundError):
                 version('foo')
+
+
+class TestEntryPoints(unittest.TestCase):
+    def __init__(self, *args):
+        super(TestEntryPoints, self).__init__(*args)
+        self.ep = importlib.metadata.EntryPoint('name', 'value', 'group')
+
+    def test_entry_point_pickleable(self):
+        revived = pickle.loads(pickle.dumps(self.ep))
+        assert revived == self.ep
+
+    def test_immutable(self):
+        """EntryPoints should be immutable"""
+        with self.assertRaises(AttributeError):
+            self.ep.name = 'badactor'
+
+    def test_repr(self):
+        assert 'EntryPoint' in repr(self.ep)
+        assert 'name=' in repr(self.ep)
+        assert "'name'" in repr(self.ep)
+
+    def test_hashable(self):
+        """EntryPoints should be hashable"""
+        hash(self.ep)
+
+    def test_json_dump(self):
+        """
+        json should not expect to be able to dump an EntryPoint
+        """
+        with self.assertRaises(Exception):
+            json.dumps(self.ep)