Tests for command SET

[arpitbbhayani]

Currently, there are almost no unit tests for the SET command. We need a comprehensive test suite for this command that also checks the correctness and completeness.

1. covers the correctness of single command
2. covers the correctness when multiple commands are fired
3. no commands are dropped abruptly
4. ensure we check for small, large, and massive inputs (if applicable)

[sahil1913]

@arpitbbhayani for SET command the tests are in set_test.go.
Are more tests required for it?

[arpitbbhayani]

Yes. Correctness is yet to be tested. Long input, different data types, and bulk commands.

[nihcas700]

@arpitbbhayani I have made some code changes for this task, would be great to have the permissions to open a PR.

[lucifercr07]

@nihcas700 you can fork the repo and raise a PR, no other permissions are required I believe.

[nihcas700]

Thanks @lucifercr07. Opened the MR. Looks like there are some conflicts, let me rebase it