test(multi-collateral): add transfer utils

[MohammadNassar1]

Note

Introduces multi-collateral transfer support in flow tests and validates balances for non-base assets.

• Add transfer_spot_request to infra.cairo and perps_tests_facade.cairo; refactor into _transfer_request that accepts an explicit asset_id
• Update transfer path to branch on base collateral vs spot (get_position_collateral_balance vs get_position_asset_balance) and validate with validate_asset_balance for non-base assets; adjust events to use provided asset_id
• New test test_spot_collateral_deposit_transfer_withdraw covering STRK spot asset deposit, partial transfer, and withdrawals with final balance assertions

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This change is 

[omri-ba-starkware]

@omri-ba-starkware reviewed 3 files and all commit messages, and made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ishay-starkware and @RoeeGross).

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workspace/apps/perpetuals/contracts/src/tests/flow_tests/perps_tests_facade.cairo line 1151 at r1 (raw file):

                asset_id: self.collateral_id,
                :amount,
                caller: sender,

So in our tests the sender is always the one who calls the request and never the receiver?

Code quote:

caller: sender

[MohammadNassar1]

@MohammadNassar1 made 1 comment.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ishay-starkware and @RoeeGross).

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workspace/apps/perpetuals/contracts/src/tests/flow_tests/perps_tests_facade.cairo line 1151 at r1 (raw file):

Previously, omri-ba-starkware wrote…

So in our tests the sender is always the one who calls the request and never the receiver?

Good point. I initialy copied the withdraw/deposit behavior, but in the transfer, the user only calls the function, so testing different callers isn’t necessary.
I renamed the internal function and clarified that it’s not meant to be called by the test.

[omri-ba-starkware]

@omri-ba-starkware reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @ishay-starkware and @RoeeGross).