[HOLD for payment 2025-02-04] [Create Expense - Clean Up] Add unit tests

[grgia]

Follow up to #55016

Relevant:
#55016 (comment)
#55016 (comment)

@JKobrynski

[JKobrynski]

Hi, I'm Julian from Callstack - expert agency - and I would like to work on this issue.

[JKobrynski]

Update:

The PR is ready for review!

CC: @grgia

[grgia]

PR merged, nice!

[grgia]

@mananjadhav could you remind me, do you need BZ to manually pay for these issues or are you automatically paid

[mananjadhav]

Need a BZ member to add a payment summary after the regression period. I will then be able to request the payment on ND.