Download setuptools and wheel to packages

Author: xoviat

tests/functional/test_install_reqs.py

@@ -302,6 +302,8 @@ def test_constraints_local_editable_install_causes_error(script, data):
 
 def test_constraints_local_editable_install_pep518(script, data):
     to_install = data.src.join("pep518-3.0")
+
+    script.pip('download', 'setuptools', 'wheel', '-d', data.packages)
     result = script.pip(
         'install', '--no-index', '-f', data.find_links, '-e', to_install)