PR feedback

Author: rouge8

news/6419.bugfix

@@ -1 +1 @@
-Fix NameError when handling InvalidRequirement in install_req_from_req_string.
+Fix ``NameError`` when handling an invalid requirement.

tests/unit/test_req_install.py

@@ -55,9 +55,13 @@ def test_install_req_from_string_invalid_requirement(self):
         Requirement strings that cannot be parsed by
         packaging.requirements.Requirement raise an InstallationError.
         """
-        with pytest.raises(InstallationError):
+        with pytest.raises(InstallationError) as excinfo:
             install_req_from_req_string("http:/this/is/invalid")
 
+        assert str(excinfo.value) == (
+            "Invalid requirement: 'http:/this/is/invalid'"
+        )
+
     def test_install_req_from_string_without_comes_from(self):
         """
         Test to make sure that install_req_from_string succeeds