[MRG] update a tricky test to use sourmash sketch instead of compute

[ctb]

Over in #1680 while tackling converting tests from using sourmash compute over to using sourmash sketch, @keyabarve ran into a particularly tricky test that can't be directly converted. This PR rewrites the test to use sourmash sketch to check the same code that the original test was testing, sourmash_args.py::load_query_signatures(...).

@keyabarve happy to wait to merge this until #1680 has been merged, or you can review and merge it now if you like.

[codecov]

Codecov Report

Merging #1687 (151916e) into latest (7f7dbba) will increase coverage by 7.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           latest    #1687      +/-   ##
==========================================
+ Coverage   82.60%   90.10%   +7.50%     
==========================================
  Files         113       86      -27     
  Lines       11995     8197    -3798     
  Branches     1513     1513              
==========================================
- Hits         9908     7386    -2522     
+ Misses       1832      556    -1276     
  Partials      255      255              

Flag	Coverage Δ
python	90.10% <ø> (ø)
rust	?

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Impacted Files	Coverage Δ
src/core/src/cmd.rs
src/core/src/ffi/nodegraph.rs
src/core/src/errors.rs
src/core/src/ffi/mod.rs
src/core/tests/test.rs
src/core/src/sketch/minhash.rs
src/core/src/index/bigsi.rs
src/core/src/sketch/hyperloglog/mod.rs
src/core/src/sketch/nodegraph.rs
src/core/src/signature.rs
... and 17 more

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[keyabarve]

@ctb Should I merge this?

[ctb]

We need a review first. I just sent you a review request via the github interface.

[keyabarve]

I was wondering if the comments were supposed to be removed. But otherwise, lgtm!

[ctb]

thanks - the only comments I see are ones that explain what the code is doing, which I think are probably fine to leave in there. are there comments that you think we should remove?

[keyabarve]

No, I don't think so. Thanks! I'll submit an approving review then.

[keyabarve]

lgtm!