test: add balances delay (more balance changes) flow

[arad-starkware]

This change is 

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Note

Adds a new BalancesDelayMoreBalanceChangeFlow covering multi-epoch stake/delegation changes around upgrade and registers its mainnet fork test; also prunes an obsolete idea from flow_ideas.md.

• Flow tests:
  • New BalancesDelayMoreBalanceChangeFlow: Adds a comprehensive flow in src/flow_test/flows.cairo that validates total staking power and STRK/BTC rewards across multiple epochs with additional balance changes pre/post-upgrade, including attestation and delegator/staker reward assertions.
  • Test hook: Registers balances_delay_more_balance_change_flow_test in src/flow_test/fork_test.cairo.
• Docs:
  • Remove obsolete "k=1 -> k=2 Migration Staker" idea from src/flow_test/flow_ideas.md.

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[arad-starkware]

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• test: add balances delay (more balance changes) flow #84 👈 (View in Graphite)
• test: add accrue_rewards_across_versions flow #82 : 1 other dependent PR (#83 )
• test: add attest after upgrade test #71
• test: add token state after upgrade flow #59
• test: add update_rewards toggle tokens flow test #57
• test: add balances delay flow #65
• chore: update flow ideas #61
• main

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[cursor]

Bug: Inconsistent tolerance for STRK delegator rewards assertion

The final STRK delegator rewards assertion uses wide_abs_diff with a tolerance of 1, while all other reward assertions in this flow (including the BTC delegator rewards on the next line) use exact equality. This inconsistency differs from the similar BalancesDelayBalanceChangeFlow which uses exact equality for all delegator reward checks. This suggests a potential rounding issue being masked rather than properly addressed, or an unintended deviation from the established pattern.

 

[noa-starkware]

Reviewable status: 0 of 3 files reviewed, 3 unresolved discussions (waiting on @arad-starkware)

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-- commits line 2 at r2:
Rename the PR

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src/flow_test/flow_ideas.md line 38 at r2 (raw file):

- staker enter in V2, advance epoch, upgrade to V3, advance epoch, attest,
- staker in V2, update balance staker+update balance pool, upgrade, attest in current epoch, attest in next epoch, attest in next next epoch
- staker in V2, advance epoch, update balance staker+update balance pool, advance epoch, update balance staker+update balance pool, upgrade, update balance staker+update balance pool, attest in current epoch, attest in next epoch, attest in next next epoch

Do you implemented 2 tests or one for both lines?

[arad-starkware]

Reviewable status: 0 of 3 files reviewed, 1 unresolved discussion (waiting on @arad-starkware and @noa-starkware)

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src/flow_test/flow_ideas.md line 38 at r2 (raw file):

Previously, noa-starkware wrote…

Do you implemented 2 tests or one for both lines?

We discussed offline, the second test eclipses the first one, so only the second one is implemented