test: Added test cases for precisionMultiplier

[aeharvlee]

Description

More test cases make easy to understand how the function actually works.

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[likhita-809]

changes seem to be correct, agree that more testcases helps in understanding the precisionMultiplier better

[julienrbrt]

Thanks for the PR! Would you be up to add a quick go doc on the function itself, so it is extra clear then.

[aeharvlee]

@julienrbrt
Thanks for the review.
By the way, where should I add go doc (comments that explain the functions)?

The comment for precisionMultiplier already exists.

Please let me know If I'm missing something :)

[aeharvlee]

@alexanderbez
@facundomedica

I see some failed test cases but It doesn't look like I can solve it.
Please let me know if there's anything else I need to do.

Thanks :)