Skip tests that fail on Python 2

Author: pradyunsg

tests/functional/test_install.py

@@ -1837,6 +1837,7 @@ def test_install_yanked_file_and_print_warning(script, data):
     assert 'Successfully installed simple-3.0\n' in result.stdout, str(result)
 
 
+@skip_if_python2
 @pytest.mark.parametrize("install_args", [
     (),
     ("--trusted-host", "localhost"),

tests/functional/test_install_config.py

@@ -5,6 +5,7 @@
 
 import pytest
 
+from tests.lib import skip_if_python2
 from tests.lib.server import (
     authorization_response,
     file_response,
@@ -129,6 +130,7 @@ def test_command_line_appends_correctly(script, data):
     ), 'stdout: {}'.format(result.stdout)
 
 
+@skip_if_python2
 def test_config_file_override_stack(
     script, virtualenv, mock_server, shared_data
 ):
@@ -247,6 +249,7 @@ def test_prompt_for_authentication(script, data, cert_factory):
            result.stdout, str(result)
 
 
+@skip_if_python2
 def test_do_not_prompt_for_authentication(script, data, cert_factory):
     """Test behaviour if --no-input option is given while installing
     from a index url requiring authentication

tests/functional/test_install_reqs.py

@@ -582,8 +582,6 @@ def test_install_distribution_union_with_versions(
         expect_error=(resolver_variant == "2020-resolver"),
     )
     if resolver_variant == "2020-resolver":
-        packages = ["localextras[bar] 0.0.1", "localextras[baz] 0.0.2"]
-
         assert "Cannot install localextras[bar]" in result.stderr
         assert (
             "localextras[bar] 0.0.1 depends on localextras 0.0.1"