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test-lib-functions: fix test_subcommand_inexact
The implementation of test_subcommand_inexact() was originally introduced in e4d0c11 (repack: respect kept objects with '--write-midx -b', 2021-12-20) with the intention to allow finding a subcommand based on an initial set of arguments. The inexactness was intended as a way to allow flexible options beyond that initial set, as opposed to test_subcommand() which requires that the full list of options is provided in its entirety. The implementation began by copying test_subcommand() and replaced the repeated argument 'printf' statement to append ".*" instead of "," to each argument. This has a few drawbacks: 1. Most importantly, this repeats the use of ".*" within 'expr', so the inexact match is even more flexible than expected. It allows the list of arguments to exist as a subsequence (with any other items included between those arguments). 2. The line 'expr="$(expr%,}"' that previously removed a trailing comma now no longer does anything, since the string ends with ".*". Both of these issues are fixed by keeping the addition of the comma in the printf statement, then adding ".*" after stripping out the trailing comma. All existing tests continue to pass with this change. There was one instance from t7700-repack.sh that was taking advantage of this flexibility, but it was removed in the previous change. Helped-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Derrick Stolee <derrickstolee@github.com>
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