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Massimiliano Culpo authored
- [x] Factored to a common place the fixture `testing_gpg_directory`, renamed it as `mock_gnupghome` - [x] Removed altogether the function `has_gnupg2` For `has_gnupg2`, since we were not trying to parse the version from the output of: ```console $ gpg2 --version ``` this is effectively equivalent to check if `spack.util.gpg.GPG.gpg()` was found. If we need to ensure version is `^2.X` it's probably better to do it in `spack.util.gpg.GPG.gpg()` than in a separate function.
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