Update Debian, RPM, Nix flake, and Python installer unit tests to match the current
installer behavior and to run correctly inside the Nix development shell.
- DebianControlInstaller:
- Add clearer docstrings for supports() behavior.
- Relax final install assertion to accept dpkg -i, sudo dpkg -i, or
sudo apt-get install -y.
- Keep checks for apt-get update, apt-get build-dep, and dpkg-buildpackage.
- RpmSpecInstaller:
- Add docstrings for supports() conditions.
- Mock _prepare_source_tarball() to avoid touching the filesystem.
- Assert builddep, rpmbuild -ba, and sudo dnf install -y commands.
- NixFlakeInstaller:
- Ensure supports() and run() tests simulate a non-Nix-shell environment
via IN_NIX_SHELL and PKGMGR_DISABLE_NIX_FLAKE_INSTALLER.
- Verify that the old profile entry is removed and both pkgmgr and default
flake outputs are installed.
- Confirm _ensure_old_profile_removed() swallows SystemExit.
- PythonInstaller:
- Make supports() and run() tests ignore the real IN_NIX_SHELL environment.
- Assert that pip install . is invoked with cwd set to the repository
directory.
These changes make the unit tests stable in the Nix dev shell and align them
with the current installer implementations.
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