test: add tests to ndarray/some-by for complete test coverage

[headlessNode]

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Resolves stdlib-js/metr-issue-tracker#93.

Description

What is the purpose of this pull request?

This pull request:

• add tests to ndarray/some-by for complete test coverage

Related Issues

Does this pull request have any related issues?

This pull request:

• resolves [BUG]: add tests to ndarray/some-by for complete test coverage metr-issue-tracker#93

Questions

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No.

Other

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No.

Checklist

Please ensure the following tasks are completed before submitting this pull request.

• Read, understood, and followed the contributing guidelines.

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[stdlib-bot]

Coverage Report

Package	Statements	Branches	Functions	Lines
ndarray/some-by	$\color{green}597/597$ $\color{green}+100.00\%$	$\color{green}80/80$ $\color{green}+100.00\%$	$\color{green}3/3$ $\color{green}+100.00\%$	$\color{green}597/597$ $\color{green}+100.00\%$

The above coverage report was generated for the changes in this PR.

[kgryte]

@headlessNode I made a number of changes to the tests in ndarray/any-by. I suggest going through and seeing what all should be carried over to here: #8110.