update json().arrindex() default values

[davemcphee]

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Description of change

Refactor default start / stop values in the json().arrindex() function. Previously, if stop was unset, the stop value would default to -1. If the value being searched was the last element in an array, and stop was set to -1, the server would reply with -1 instead of the element's index.

eg.: given a json object myarr: {"l": ["a", "b", "c", "d"]}:

localhost:36379> JSON.ARRINDEX myarr $.l '"d"'            # no start or stop set
1) (integer) 3
localhost:36379> JSON.ARRINDEX myarr $.l '"d"' 0 10000    # stop set to some huge value
1) (integer) 3
localhost:36379> JSON.ARRINDEX myarr $.l '"d"' 0 -1       # stop set to -1
1) (integer) -1
localhost:36379> JSON.ARRINDEX myarr $.l '"d"' 0          # start set to 0, but stop omitted
1) (integer) 3

By only appending start and stop values to the JSON.ARRINDEX command if they're set, the python client more closely mimics redis' behaviour.

Fixes #2481

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.07 ⚠️

Comparison is base (6c708c2) 92.31% compared to head (69ea3da) 92.25%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2611      +/-   ##
==========================================
- Coverage   92.31%   92.25%   -0.07%     
==========================================
  Files         115      115              
  Lines       29744    29760      +16     
==========================================
- Hits        27459    27455       -4     
- Misses       2285     2305      +20     

Impacted Files	Coverage Δ
redis/commands/json/commands.py	89.51% <100.00%> (+0.44%)	⬆️
tests/test_asyncio/test_json.py	100.00% <100.00%> (ø)
tests/test_json.py	100.00% <100.00%> (ø)

... and 5 files with indirect coverage changes

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[dvora-h]

Thanks for the fix!

[davemcphee]

Fixed the bool checks - forgot that 0 is falsey. Added a few more unit tests.

[dvora-h]

@davemcphee Great, thank you! Can you add the tests also to the async test (in test_asyncio/test_json.py)?