Integrate change from Czaki and test for that change

Author: adamtheturtle

pip_check_reqs/find_missing_reqs.py

@@ -68,7 +68,10 @@ def find_missing_reqs(options, requirements_filename):
         # We exclude the "except" from coverage so that on any pip version we
         # can report 100% coverage.
         except AttributeError:  # pragma: no cover
-            requirement_name = requirement.requirement
+            from pip._internal.req.constructors import install_req_from_line
+            requirement_name = install_req_from_line(
+                requirement.requirement,
+            ).name
 
         log.debug('found requirement: %s', requirement_name)
         explicit.add(canonicalize_name(requirement_name))

tests/test_find_missing_reqs.py

@@ -65,7 +65,7 @@ def test_find_missing_reqs(monkeypatch, tmp_path: Path):
                         pretend.call_recorder(lambda x: packages_info))
 
     fake_requirements_file = tmp_path / 'requirements.txt'
-    fake_requirements_file.write_text('spam')
+    fake_requirements_file.write_text('spam==1')
 
     result = list(
         find_missing_reqs.find_missing_reqs(