selftests/proc: add tests for new pidns APIs

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Link: https://lore.kernel.org/20250805-procfs-pidns-api-v4-4-705f984940e7@cyphar.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Aleksa Sarai 2025-08-05 15:45:11 +10:00 • committed by Christian Brauner
commit 5554d820f7
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