Run functional tests

- Drop test requirement of python-wheel-wheel
- Use pytest-xdist to run tests faster

The motivation for this was the need to drop python-wheel-wheel in wheel 0.46+.
Due to newly gained runtime dependencies of wheel,
such wheel cannot be used as is.

I realized that when the explicit BuildRequires is removed,
the package is brought in by python3-virtualenv.
But even when python3-virtualenv drops the dependency,
the tests still passed without python-wheel-wheel.

Because the tests that require packaged wheels were all --ignored
for obsolete reasons. When unignored, they errored due to missing coverage.whl.

While attempting to fix this, I realized we cannot use the RPM packaged wheel anyway.

When the functional tests run, it takes a while, hence pytest-xdist.

---

For the record, the coverage-0-py3-none-any.whl was created as:

    [project]
    name = "coverage"
    version = "0"

    [build-system]
    requires = ["setuptools >= 77.0.3"]
    build-backend = "setuptools.build_meta"

And coverage.py with:

    def process_startup():
        pass

Wheel generated by `python3 -m build` (with python3-build-1.2.1-4.fc41.noarch).

.gitignore

@@ -4,4 +4,4 @@
 /pip/
 /results_python-pip/
 *.rpm
-
+*.whl

python-pip.spec

@@ -44,6 +44,28 @@ License:        MIT AND Python-2.0.1 AND Apache-2.0 AND BSD-2-Clause AND BSD-3-C
 URL:            https://pip.pypa.io/
 Source0:        https://github.com/pypa/pip/archive/%{upstream_version}/%{srcname}-%{upstream_version}.tar.gz
 
+# The following sources are wheels used only for tests.
+# They are not bundled in the built package and do not contribute to the overall license.
+# They are pre-built but only contain text files, rebuilding them in %%build has very little benefit.
+
+# setuptools.whl
+# We cannot use RPM-packaged python-setuptools-wheel because upstream pins to <80.
+# See https://github.com/pypa/pip/pull/13357 for rationale.
+Source1:        https://files.pythonhosted.org/packages/0d/6d/b4752b044bf94cb802d88a888dc7d288baaf77d7910b7dedda74b5ceea0c/setuptools-79.0.1-py3-none-any.whl
+
+# wheel.whl
+# We cannot use RPM-packaged python-wheel-wheel because we intent to drop that package in wheel 0.46+.
+# That version of wheel has runtime dependencies and is generally useless as a standalone wheel.
+# See https://github.com/pypa/pip/pull/13382 as an attempt to drop the requirement from pip tests.
+Source2:        https://files.pythonhosted.org/packages/0b/2c/87f3254fd8ffd29e4c02732eee68a83a1d3c346ae39bc6822dcbcb697f2b/wheel-0.45.1-py3-none-any.whl
+
+# coverage.whl
+# There is no RPM-packaged python-coverage-wheel, the package is archful.
+# Upstream uses this to measure coverage, which we don't.
+# This is a dummy placeholder package that only contains empty coverage.process_startup().
+# That way, we don't need to patch the usage out of conftest.py.
+Source3:        coverage-0-py3-none-any.whl
+
 BuildArch:      noarch
 
 %if %{with tests}
@@ -51,8 +73,7 @@ BuildRequires:  /usr/bin/git
 BuildRequires:  /usr/bin/hg
 BuildRequires:  /usr/bin/bzr
 BuildRequires:  /usr/bin/svn
-BuildRequires:  python-setuptools-wheel
-BuildRequires:  python-wheel-wheel
+BuildRequires:  python%{python3_pkgversion}-pytest-xdist
 %endif
 
 %if %{with man}
@@ -190,9 +211,6 @@ A Python wheel of pip to use with venv.
 # this goes together with patch4
 rm src/pip/_vendor/certifi/*.pem
 
-# tests expect wheels in here
-ln -s %{python_wheel_dir} tests/data/common_wheels
-
 # Remove windows executable binaries
 rm -v src/pip/_vendor/distlib/*.exe
 sed -i '/\.exe/d' pyproject.toml
@@ -200,6 +218,12 @@ sed -i '/\.exe/d' pyproject.toml
 # Remove unused test requirements
 sed -Ei '/(pytest-(cov|xdist|rerunfailures)|proxy\.py)/d' tests/requirements.txt
 
+%if %{with tests}
+# tests expect wheels in here
+mkdir tests/data/common_wheels
+cp -a %{SOURCE1} %{SOURCE2} %{SOURCE3} tests/data/common_wheels
+%endif
+
 
 %if %{with tests}
 %generate_buildrequires
@@ -272,15 +296,20 @@ grep "pem$" %{pyproject_files} && exit 1 || true
 # Upstream tests
 # bash completion tests only work from installed package
 pytest_k='not completion'
+# this clashes with our PYTHONPATH
+pytest_k="$pytest_k and not environments_with_no_pip"
+# this seems to require internet (despite no network marker)
+# added in https://github.com/pypa/pip/pull/13378 TODO drop this in the next release
+pytest_k="$pytest_k and not test_prompt_for_keyring_if_needed and not test_double_install_fail and not test_install_sdist_links and not test_lock_vcs and not test_lock_archive and not test_backend_sees_config_via_sdist"
+# this cannot import breezy, TODO investigate
+pytest_k="$pytest_k and not (functional and bazaar)"
+# failures to investigate
+pytest_k="$pytest_k and not test_all_fields and not test_report_mixed_not_found and not test_basic_show"  # "Editable project location" missing
+pytest_k="$pytest_k and not test_basic_install_from_wheel"
+pytest_k="$pytest_k and not test_check_unsupported"
 
-# --ignore'd tests are not compatible with the latest virtualenv
-# These files contain almost 500 tests so we should enable them back
-# as soon as pip will be compatible upstream
-# https://github.com/pypa/pip/pull/8441
-# among them, tests/functional/test_proxy.py needs proxy.py which is not
-# yet packaged in Fedora
-%pytest -m 'not network' -k "$(echo $pytest_k)" \
-    --ignore tests/functional --ignore tests/lib/test_lib.py
+%pytest -n auto -m 'not network' -k "$(echo $pytest_k)" \
+    --ignore tests/functional/test_proxy.py  # no proxy.py in Fedora
 %endif
 
 

sources

@@ -1 +1,4 @@
 SHA512 (pip-25.1.1.tar.gz) = ce61c9861265139b3c5ea9be9dc246097cd75c21687cf8301f80a377d02420c4524f0d6307d2ca0232ff8715b1105343bcfdb9cac6b69503780ab2c4645558dc
+SHA512 (setuptools-79.0.1-py3-none-any.whl) = fef6cfc6f95a5bb7320f1680e1c665cb8d9a4e4227cde4d8aab8a50bed4bcf04320085b9d7d5343359f887008db5c5a861e57f3d08b7b0b2311a28adaeee6b4a
+SHA512 (wheel-0.45.1-py3-none-any.whl) = 86c16248ec804ee0ac95d43b03d47351dceb534d0cdc4025ca1eb073e39e539de44c870b9261f0373144e1537f0e42675a759a318a8d5d346bbd9efcb704061d
+SHA512 (coverage-0-py3-none-any.whl) = e734192565347010efe68f8ba600254259c9b647f3c553fd4e5d87b1d7f955cb15d6f7d807716f4a6415d239beed945fbec7210feaf502e9cc849c332845926e