Add unit tests for creator supply read after multiple sequential buys

[Chucks1093]

Summary
The creator supply read method is unit-tested in isolation, but not across a sequence of buys that each increment supply. A sequential buy test confirms the supply accumulates correctly and matches the sum of all purchase amounts.

Scope

• add a unit test that performs three or more sequential buys and reads supply after each one
• assert supply after each buy equals the cumulative total of amounts purchased
• assert the final supply matches the sum of all individual buy amounts

Acceptance Criteria

• supply increments correctly after each sequential buy
• the final supply equals the sum of all buy amounts in the sequence
• the test uses the existing buy fixture conventions

Contributor coordination: if you pick this up, reach out in Telegram for updates or clarification: https://t.me/accesslayerorg

[emynogithub]

@emynogithub has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

I’m excited about the opportunity to contribute, collaborate with the team, and deliver quality work.

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[ALLEN-AYODEJI]

@ALLEN-AYODEJI has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hey Chucks!
May i please work on this issue!

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[razeprasine]

@razeprasine has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi Maintainer, I will love to fix this issue

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