CI: Run upstream unit tests for hatchling

.fmf/version

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+1

plan.fmf

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+discover:
+    how: fmf
+execute:
+    how: tmt

tests/unit/main.fmf

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+summary: run upstream unit tests
+test: ./runtest.sh
+require:
+  - cargo
+  - git-core
+  - python3-click
+  - python3-filelock
+  - python3-hatchling
+  - python3-httpx
+  - python3-packaging
+  - python3-pathspec
+  - python3-platformdirs
+  - python3-pytest
+  - python3-pytest-mock
+  - python3-rich
+  - python3-tomli-w
+  - python3-virtualenv
+duration: 10m

tests/unit/runtest.sh

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+#!/bin/bash -eux
+
+# Get the version of our installed component
+VERSION=$(rpm -q --queryformat="%{VERSION}" python3-hatchling)
+
+# The hatch's source code contains the tests for hatchling in tests/backend
+git clone --depth 1 --branch hatchling-v$VERSION https://github.com/pypa/hatch/
+cd hatch
+
+# Delete the hatchling sources from the repository - we want to test the RPM package
+rm -r backend/
+
+# Work around tests wanting a proper Hatch installation
+echo '__version__ = "(bogus)"' > src/hatch/_version.py
+
+# test_extra_met and test_unknown_extra try to pip install requests[security]==2.25.1
+# which is too old to be compiled for Python 3.13 - skip them
+k="not test_extra_met and not test_unknown_extra"
+
+PYTHONPATH="$PWD/src" python3 -m pytest tests/backend -k "${k}" -v