bpo-43926: Cleaner metadata with PEP 566 JSON support. (GH-25565)

* bpo-43926: Cleaner metadata with PEP 566 JSON support.

* Add blurb

* Add versionchanged and versionadded declarations for changes to metadata.

* Use descriptor for PEP 566

1 files changed, 23 insertions, 0 deletions

diff --git a/Lib/test/test_importlib/test_metadata_api.py b/Lib/test/test_importlib/test_metadata_api.py
index 657c16603f..825edc10f1 100644
--- a/Lib/test/test_importlib/test_metadata_api.py
+++ b/Lib/test/test_importlib/test_metadata_api.py
@@ -231,6 +231,29 @@ class APITests(
 
         assert deps == expected
 
+    def test_as_json(self):
+        md = metadata('distinfo-pkg').json
+        assert 'name' in md
+        assert md['keywords'] == ['sample', 'package']
+        desc = md['description']
+        assert desc.startswith('Once upon a time\nThere was')
+        assert len(md['requires_dist']) == 2
+
+    def test_as_json_egg_info(self):
+        md = metadata('egginfo-pkg').json
+        assert 'name' in md
+        assert md['keywords'] == ['sample', 'package']
+        desc = md['description']
+        assert desc.startswith('Once upon a time\nThere was')
+        assert len(md['classifier']) == 2
+
+    def test_as_json_odd_case(self):
+        self.make_uppercase()
+        md = metadata('distinfo-pkg').json
+        assert 'name' in md
+        assert len(md['requires_dist']) == 2
+        assert md['keywords'] == ['SAMPLE', 'PACKAGE']
+
 
 class LegacyDots(fixtures.DistInfoPkgWithDotLegacy, unittest.TestCase):
     def test_name_normalization(self):