chore: add localprocess backend tests

[szaher]

What this PR does / why we need it:

add some test cases for localprocess backend.

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):

Fixes #

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

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[szaher]

I think it make sense to wait for #69 to be merged to format this one

[andreyvelich]

Tests have been implemented in #91, we can close this one.
/close

[google-oss-prow]

@andreyvelich: Closed this PR.

In response to this:

Tests have been implemented in #91, we can close this one.
/close

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