Test for uppercase metadata warning

Author: melissa-kun-li

setuptools/tests/test_config.py

@@ -526,6 +526,24 @@ def test_dash_to_underscore_warning(self, tmpdir):
                 assert metadata.author_email == '[email protected]'
                 assert metadata.maintainer_email == '[email protected]'
 
+    def test_uppercase_warning(self, tmpdir):
+        # remove this test and the method uppercase_warning() in setuptools.dist
+        # when no longer needed
+        fake_env(
+            tmpdir,
+            '[metadata]\n'
+            'Name = foo\n'
+            'description = Some description\n'
+        )
+        msg = ("Usage of uppercase key 'Name' in 'metadata' will be deprecated in "
+               "future versions. "
+               "Please use lowercase 'name' instead")
+        with pytest.warns(UserWarning, match=msg):
+            with get_dist(tmpdir) as dist:
+                metadata = dist.metadata
+                assert metadata.name == 'foo'
+                assert metadata.description == 'Some description'
+
 
 class TestOptions: