Recreate scenario 1 using fork testing setup. by RZhang05 · Pull Request #128 · onflow/FlowYieldVaults

RZhang05 · 2026-01-08T21:22:44Z

Closes: #122

Depends on: #151

Description

Output

flow test cadence/tests/forked_rebalance_scenario1_test.cdc

❗   Version warning: a new version of Flow CLI is available (v2.14.2).
   Read the installation guide for upgrade instructions: https://developers.flow.com/tools/flow-cli/install 

2:56PM INF Using fork height chainId=flow-mainnet forkBlockID=24806fa16bae3ee6f3852c41ba413319306e2f5620133dd0a0786d228201a712 forkHeight=143292255 host=access.mainnet.nodes.onflow.org:9000
2:56PM INF LOG: "[TEST] Captured Position ID from event: 5"
2:56PM INF LOG: "[TEST] YieldVault ID: 208"
2:56PM INF LOG: "[TEST] Initial yield vault balance: 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 0.50000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 0.50000000 rebalance: 999.66154922"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 0.50000000: 999.66154644"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 0.50000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.66154644"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    307.59430990"
2:56PM INF LOG: "Expected Yield Tokens: 307.69230769"
2:56PM INF LOG: "Precision Difference:  -0.09799779"
2:56PM INF LOG: "Percent Difference:    -0.03184900%"
2:56PM INF LOG: "Yield Token Change:    -307.71739400"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   307.63156572"
2:56PM INF LOG: "Value Change:          -307.75466473"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 0.80000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 0.80000000 rebalance: 999.78846826"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 0.80000000: 999.78846652"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 0.80000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.78846652"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    492.22474510"
2:56PM INF LOG: "Expected Yield Tokens: 492.30769231"
2:56PM INF LOG: "Precision Difference:  -0.08294721"
2:56PM INF LOG: "Percent Difference:    -0.01684800%"
2:56PM INF LOG: "Yield Token Change:    -123.08695880"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   492.28436336"
2:56PM INF LOG: "Value Change:          -123.10186709"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 1.00000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 1.00000000 rebalance: 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 1.00000000: 999.83077461"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 1.00000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.83077461"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    615.31170390"
2:56PM INF LOG: "Expected Yield Tokens: 615.38461538"
2:56PM INF LOG: "Precision Difference:  -0.07291148"
2:56PM INF LOG: "Percent Difference:    -0.01184800%"
2:56PM INF LOG: "Yield Token Change:    -0.00000000"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   615.38623045"
2:56PM INF LOG: "Value Change:          -0.00000000"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 1.20000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 1.20000000 rebalance: 999.85897884"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 1.20000000: 999.83077471"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 1.20000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.83077471"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    738.37404468"
2:56PM INF LOG: "Expected Yield Tokens: 738.46153846"
2:56PM INF LOG: "Precision Difference:  -0.08749378"
2:56PM INF LOG: "Percent Difference:    -0.01184800%"
2:56PM INF LOG: "Yield Token Change:    +123.06234078"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   738.46347654"
2:56PM INF LOG: "Value Change:          +123.07724609"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 1.50000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 1.50000000 rebalance: 999.88718307"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 1.50000000: 999.83077533"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 1.50000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.83077533"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    922.96755535"
2:56PM INF LOG: "Expected Yield Tokens: 923.07692308"
2:56PM INF LOG: "Precision Difference:  -0.10936773"
2:56PM INF LOG: "Percent Difference:    -0.01184800%"
2:56PM INF LOG: "Yield Token Change:    +307.65585145"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   923.07934518"
2:56PM INF LOG: "Value Change:          +307.69311473"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 2.00000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 2.00000000 rebalance: 999.91538730"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 2.00000000: 999.83077582"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 2.00000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.83077582"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    1230.62340780"
2:56PM INF LOG: "Expected Yield Tokens: 1230.76923077"
2:56PM INF LOG: "Precision Difference:  -0.14582297"
2:56PM INF LOG: "Percent Difference:    -0.01184800%"
2:56PM INF LOG: "Yield Token Change:    +615.31170390"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   1230.77246090"
2:56PM INF LOG: "Value Change:          +615.38623045"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 3.00000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 3.00000000 rebalance: 999.94359153"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 3.00000000: 999.83077702"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 3.00000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.83077702"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    1845.93511071"
2:56PM INF LOG: "Expected Yield Tokens: 1846.15384615"
2:56PM INF LOG: "Precision Difference:  -0.21873544"
2:56PM INF LOG: "Percent Difference:    -0.01184800%"
2:56PM INF LOG: "Yield Token Change:    +1230.62340681"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   1846.15869037"
2:56PM INF LOG: "Value Change:          +1230.77245992"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 5.00000000 999.83077461"
2:56PM INF LOG: "[TEST] YieldVault balance before flow price 5.00000000 rebalance: 999.96615492"
2:56PM INF LOG: "[TEST] YieldVault balance after flow before 5.00000000: 999.83077697"
2:56PM INF LOG: "\n=== SCENARIO 1 DETAILS for Flow Price 5.00000000 ==="
2:56PM INF LOG: "YieldVault Balance:          999.83077697"
2:56PM INF LOG: "Yield Tokens Before:   615.31170390"
2:56PM INF LOG: "Yield Tokens After:    3076.55851451"
2:56PM INF LOG: "Expected Yield Tokens: 3076.92307692"
2:56PM INF LOG: "Precision Difference:  -0.36456241"
2:56PM INF LOG: "Percent Difference:    -0.01184800%"
2:56PM INF LOG: "Yield Token Change:    +2461.24681061"
2:56PM INF LOG: "Current Value Before:  615.38623045"
2:56PM INF LOG: "Current Value After:   3076.93114727"
2:56PM INF LOG: "Value Change:          +2461.54491682"
2:56PM INF LOG: "=============================================\n"
2:56PM INF LOG: "[TEST] flow balance after 0.00100000"

Test results: "cadence/tests/forked_rebalance_scenario1_test.cdc"
- PASS: test_ForkedRebalanceYieldVaultScenario1

For contributor use:

Targeted PR against master branch
Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
Code follows the standards mentioned here.
Updated relevant documentation
Re-reviewed Files changed in the Github PR explorer
Added appropriate labels

liobrasil · 2026-01-27T21:12:47Z

cadence/tests/forked_rebalance_scenario1_test.cdc

+
+	// Expected values from Google sheet calculations
+	let expectedYieldTokenValues: {UFix64: UFix64} = {
+		0.5: 307.69230769,


The expectedYieldTokenValues are the debt notional (at target health factor) in the unit of account i.e MOET/USD: expectedYieldTokenValue = expectedDebt = fundingAmount * flowPrice * collateralFactor / targetHealthFactor. It doesn't not account for the fees associated with swapping (nor price impact) MOET to yieldToken on the DEX when we create the yieldVault (ie. yieldToMoetSwapper in the createStrategy), as a consequence: expectedYieldTokenValue < expectedDebt.The bridge fees are in FLOW and covered by the protocol.

…pers

cadence/tests/forked_rebalance_scenario1_test.cdc

jribbink · 2026-02-26T21:15:16Z

cadence/tests/forked_rebalance_scenario1_test.cdc

+// helps match expected values by increasing the amount of tokens we would get
+// normally amount of tokens we would get is true_price * (1 - fee_rate)
+// now we get true_price / (1 - fee_rate) * (1 - fee_rate) = true_price
+access(all) let fee3000Premium: UFix64 = 1.0 / (1.0-0.003)
+access(all) let fee100Premium: UFix64 = 1.0 / (1.0 - 0.0001)


👌 This makes sense to me, we should be able to get our numbers much, much closer like this.

The only thing we need to be mindful of is that this adjustment and swaps only happen in a single direction. Conceptually, I would think that this should be the case (why swap both ways & pay extra fees if you never needed to swap the tokens in the first place), but just wanted to flag this if we start to see any irreducible discrepancies.

The other option is that we could just tighten our assertions by calculating fee adjusted values to test against.

cadence/tests/forked_rebalance_scenario1_test.cdc

flow.json

Co-authored-by: Jordan Ribbink <17958158+jribbink@users.noreply.github.com>

…YieldVaults into raymond/forked-scen1

jribbink

LGTM

RZhang05 added 10 commits January 8, 2026 16:21

Recreate scenario 1 using forked testnet.

e1007b2

Remove unused function.

351578c

Update for mainnet addresses.

5ff2bd0

Use mUSDC strategy with real oracles on testnet.

3068055

Update symbol prices.

deb846e

Switch to mainnet.

f197957

Merge branch 'main' into raymond/forked-scen1

a719c67

Add option to transfer flow from whale account instead of minting.

d52baf9

Merge branch 'nialexsan/pyusd-fyv-strategy' into raymond/forked-scen1

44a77a6

Use fixed mainnet height, new FUSDEV strategy.

0d6b270

RZhang05 self-assigned this Jan 26, 2026

RZhang05 added 2 commits January 26, 2026 15:23

Add percent tolerance check to forked test.

2e2400c

Clean up forked scenario 1.

fc67c98

liobrasil reviewed Jan 27, 2026

View reviewed changes

RZhang05 and others added 12 commits January 28, 2026 12:49

Remove unnecessary imports.

f2ea7b3

Add EVM State Manipulation Helpers For Forked Simulations

eae9d1e

Merge remote-tracking branch 'origin/main' into jribbink/evm-test-hel…

0ba2dd2

…pers

Fix bugs with decimal offsets & cleanup

c405a2c

tidy comments

af63f67

Cleanup test helpers & fix precision

bb17527

Merge remote-tracking branch 'origin/main' into jribbink/evm-test-hel…

5dc80b4

…pers

Update to newer CLI

fb8b266

address feedback

dc143d0

Add test for EVM state helpers

5939f17

cleanup test assertion

4c1df74

cleanup test assertion

d88f651

RZhang05 changed the base branch from main to feature/forked-simulations February 24, 2026 16:39

jribbink and others added 3 commits February 24, 2026 10:08

Fix percent tolerance

4f6c322

Merge branch 'feature/forked-simulations' into jribbink/evm-test-helpers

8829009

Merge branch 'main' into raymond/forked-scen1

875ff38

RZhang05 added 2 commits February 24, 2026 13:42

Merge branch 'jribbink/evm-test-helpers' into raymond/forked-scen1

845507f

Update to new strategy and use new evm helpers.

48a4275

RZhang05 changed the base branch from feature/forked-simulations to jribbink/evm-test-helpers February 24, 2026 18:55

Clean up.

e7a6683

RZhang05 force-pushed the raymond/forked-scen1 branch from 1b21dd0 to e7a6683 Compare February 24, 2026 19:01

Base automatically changed from jribbink/evm-test-helpers to feature/forked-simulations February 25, 2026 18:00

RZhang05 added 4 commits February 25, 2026 14:27

Merge branch 'feature/forked-simulations' into raymond/forked-scen1

7ab7e9c

Fix merge.

d95de5c

Normalize comments.

2a42e2b

Temporarily skip closing of yield vault.

d0c7462

RZhang05 requested a review from jribbink February 26, 2026 20:13

RZhang05 marked this pull request as ready for review February 26, 2026 20:13

RZhang05 requested a review from a team as a code owner February 26, 2026 20:13

jribbink reviewed Feb 26, 2026

View reviewed changes

cadence/tests/forked_rebalance_scenario1_test.cdc Outdated Show resolved Hide resolved

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RZhang05 and others added 3 commits February 26, 2026 16:50

Apply suggestions from code review

f2e72c6

Co-authored-by: Jordan Ribbink <17958158+jribbink@users.noreply.github.com>

Switch flow.json back to tab spacing.

ecfe8e7

Merge branch 'raymond/forked-scen1' of https://github.com/onflow/Flow…

d4b1fc1

…YieldVaults into raymond/forked-scen1

jribbink approved these changes Feb 26, 2026

View reviewed changes

RZhang05 merged commit a0a9f06 into feature/forked-simulations Feb 26, 2026
5 checks passed

RZhang05 deleted the raymond/forked-scen1 branch February 26, 2026 22:51

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Recreate scenario 1 using fork testing setup.#128

Recreate scenario 1 using fork testing setup.#128
RZhang05 merged 37 commits intofeature/forked-simulationsfrom
raymond/forked-scen1

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