From eb19c647519c754dd93b42a0c421101af73cf7a4 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Fri, 24 Jun 2022 21:15:31 -0400
Subject: [PATCH] In Distribution.from_name, require a non-empty string. Fixes
 python/cpython#93259.

---
 importlib_metadata/__init__.py | 5 ++++-
 tests/test_main.py             | 2 --
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/importlib_metadata/__init__.py b/importlib_metadata/__init__.py
index 29ce1175..bb1105b6 100644
--- a/importlib_metadata/__init__.py
+++ b/importlib_metadata/__init__.py
@@ -548,7 +548,7 @@ def locate_file(self, path):
         """
 
     @classmethod
-    def from_name(cls, name):
+    def from_name(cls, name: str):
         """Return the Distribution for the given package name.
 
         :param name: The name of the distribution package to search for.
@@ -556,7 +556,10 @@ def from_name(cls, name):
             package, if found.
         :raises PackageNotFoundError: When the named package's distribution
             metadata cannot be found.
+        :raises ValueError: When an invalid value is supplied for name.
         """
+        if not name:
+            raise ValueError("A distribution name is required.")
         for resolver in cls._discover_resolvers():
             dists = resolver(DistributionFinder.Context(name=name))
             dist = next(iter(dists), None)
diff --git a/tests/test_main.py b/tests/test_main.py
index 041220f1..921f5d9c 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -1,7 +1,6 @@
 import re
 import json
 import pickle
-import pytest
 import unittest
 import warnings
 import importlib
@@ -51,7 +50,6 @@ def test_new_style_classes(self):
         self.assertIsInstance(Distribution, type)
         self.assertIsInstance(MetadataPathFinder, type)
 
-    @pytest.mark.xfail(reason="Not implemented")
     @fixtures.parameterize(
         dict(name=None),
         dict(name=''),