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Lucas Bajolet
75e4a47686
When writing tests, one may need to write a one-off checker for a packer command that ran, without having to completely implement the Checker interface. This commit introduces a generic CustomChecker implementation (i.e. a function) that can be one-off implemented by developers if their test doesn't fit the existing gadgets, and the need is not generic/reusable enough to justify introducing a new gadget for other users.