Add test to capture legacy expectation where distinfo might appear with a dot in the name.

Author: jaraco

tests/fixtures.py

@@ -119,6 +119,21 @@ def setUp(self):
         build_files(DistInfoPkgWithDot.files, self.site_dir)
 
 
+class DistInfoPkgWithDotLegacy(OnSysPath, SiteDir):
+    files = {
+        "pkg.dot-1.0.0.dist-info": {
+            "METADATA": """
+                Name: pkg.dot
+                Version: 1.0.0
+                """,
+            },
+        }
+
+    def setUp(self):
+        super(DistInfoPkgWithDotLegacy, self).setUp()
+        build_files(DistInfoPkgWithDotLegacy.files, self.site_dir)
+
+
 class DistInfoPkgOffPath(SiteDir):
     def setUp(self):
         super(DistInfoPkgOffPath, self).setUp()

tests/test_api.py

@@ -163,6 +163,14 @@ def test_more_complex_deps_requires_text(self):
         assert deps == expected
 
 
+class LegacyDots(fixtures.DistInfoPkgWithDotLegacy, unittest.TestCase):
+    def test_name_normalization(self):
+        names = 'pkg.dot', 'pkg_dot', 'pkg-dot', 'pkg..dot', 'Pkg.Dot'
+        for name in names:
+            with self.subTest(name):
+                assert distribution(name).metadata['Name'] == 'pkg.dot'
+
+
 class OffSysPathTests(fixtures.DistInfoPkgOffPath, unittest.TestCase):
     def test_find_distributions_specified_path(self):
         dists = Distribution.discover(path=[str(self.site_dir)])