[WIP] rework this test

tests/functional/test_show.py

@@ -1,10 +1,8 @@
 import os
-import pathlib
 import re
 
 from pip import __version__
 from pip._internal.commands.show import search_packages_info
-from pip._internal.utils.unpacking import untar_file
 from tests.lib import PipTestEnvironment, TestData, create_test_package_with_setup
 
 
@@ -53,40 +51,6 @@ def test_show_with_files_from_wheel(script: PipTestEnvironment, data: TestData)
     assert f"  simpledist{os.sep}__init__.py" in lines[6:]
 
 
-def test_show_with_files_from_legacy(
-    tmp_path: pathlib.Path, script: PipTestEnvironment, data: TestData
-) -> None:
-    """
-    Test listing files in the show command (legacy installed-files.txt).
-    """
-    # Since 'pip install' now always tries to build a wheel from sdist, it
-    # cannot properly generate a setup. The legacy code path is basically
-    # 'setup.py install' plus installed-files.txt, which we manually generate.
-    source_dir = tmp_path.joinpath("unpacked-sdist")
-    setuptools_record = tmp_path.joinpath("installed-record.txt")
-    untar_file(os.fspath(data.packages.joinpath("simple-1.0.tar.gz")), str(source_dir))
-    script.run(
-        "python",
-        "setup.py",
-        "install",
-        "--single-version-externally-managed",
-        "--record",
-        str(setuptools_record),
-        cwd=source_dir,
-    )
-    write_installed_files_from_setuptools_record(
-        setuptools_record.read_text().splitlines(),
-        root=None,
-        req_description="simple==1.0",
-    )
-
-    result = script.pip("show", "--files", "simple")
-    lines = result.stdout.splitlines()
-    assert "Cannot locate RECORD or installed-files.txt" not in lines[6], lines[6]
-    assert re.search(r"Files:\n(  .+\n)+", result.stdout)
-    assert f"  simple{os.sep}__init__.py" in lines[6:]
-
-
 def test_missing_argument(script: PipTestEnvironment) -> None:
     """
     Test show command with no arguments.