Remove test_nonpep517_setuptools_import_failure test

The --no-use-pep517 option has been removed from pip as part of the move
to PEP 517-only builds. This test is no longer valid and was causing
failures. Also removed the no-longer-needed make_wheel import.

Author: notatallshaw

tests/functional/test_install_reqs.py

@@ -18,7 +18,6 @@
     requirements_file,
 )
 from tests.lib.local_repos import local_checkout
-from tests.lib.wheel import make_wheel
 
 
 class ArgRecordingSdist:
@@ -944,29 +943,6 @@ def test_config_settings_local_to_package(
     assert "--verbose" not in simple2_args
 
 
-def test_nonpep517_setuptools_import_failure(script: PipTestEnvironment) -> None:
-    """Any import failures of `setuptools` should inform the user both that it's
-    not pip's fault, but also exactly what went wrong in the import."""
-    # Install a poisoned version of 'setuptools' that fails to import.
-    name = "setuptools_poisoned"
-    module = """\
-raise ImportError("this 'setuptools' was intentionally poisoned")
-"""
-    path = make_wheel(name, "0.1.0", extra_files={"setuptools.py": module}).save_to_dir(
-        script.scratch_path
-    )
-    script.pip("install", "--no-index", path)
-
-    result = script.pip_install_local("--no-use-pep517", "simple", expect_error=True)
-    nice_message = (
-        "ERROR: Can not execute `setup.py`"
-        " since setuptools failed to import in the build environment"
-    )
-    exc_message = "ImportError: this 'setuptools' was intentionally poisoned"
-    assert nice_message in result.stderr
-    assert exc_message in result.stderr
-
-
 class TestEditableDirectURL:
     def test_install_local_project(
         self, script: PipTestEnvironment, data: TestData, common_wheels: Path