fix tests

pipenv/cli/command.py

@@ -764,6 +764,7 @@ def requirements(
 
     if categories_list:
         for category in categories_list:
+            category = category.strip()
             deps.update(lockfile.get(category, {}))
     else:
         if dev or dev_only:

tests/integration/test_requirements.py

@@ -98,17 +98,18 @@ def test_requirements_generates_requirements_from_lockfile_from_categories(pipen
             f.write(contents)
         l = p.pipenv('lock')
         assert l.returncode == 0
-        
+
         c = p.pipenv('requirements --dev-only')
         assert c.returncode == 0
         assert f'{packages[0]}=={packages[1]}' not in c.stdout
         assert f'{test_packages[0]}=={test_packages[1]}' not in c.stdout
+        assert f'{doc_packages[0]}=={doc_packages[1]}' not in c.stdout
         assert f'{dev_packages[0]}=={dev_packages[1]}' in c.stdout
 
         d = p.pipenv('requirements --categories="test, doc"')
         assert d.returncode == 0
         assert f'{packages[0]}=={packages[1]}' not in d.stdout
-        assert f'{dev_packages[0]}=={dev_packages[1]}' not in c.stdout
+        assert f'{dev_packages[0]}=={dev_packages[1]}' not in d.stdout
         assert f'{test_packages[0]}=={test_packages[1]}' in d.stdout
         assert f'{doc_packages[0]}=={doc_packages[1]}' in d.stdout