[DEPLOY-512]: Adds L2EP Foundry Tests

.github/workflows/solidity-foundry.yml

@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        product: [vrf, automation, llo-feeds, functions, shared]
+        product: [vrf, automation, llo-feeds, l2ep, functions, shared]
     needs: [changes]
     name: Foundry Tests ${{ matrix.product }}
     # See https://github.com/foundry-rs/foundry/issues/3827

contracts/GNUmakefile

@@ -1,6 +1,6 @@
 # ALL_FOUNDRY_PRODUCTS contains a list of all products that have a foundry
 # profile defined and use the Foundry snapshots. 
-ALL_FOUNDRY_PRODUCTS = llo-feeds functions shared
+ALL_FOUNDRY_PRODUCTS = l2ep llo-feeds functions shared
 
 # To make a snapshot for a specific product, either set the `FOUNDRY_PROFILE` env var
 # or call the target with `FOUNDRY_PROFILE=product`

contracts/gas-snapshots/l2ep.gas-snapshot

@@ -0,0 +1,146 @@
+ArbitrumCrossDomainForwarderAcceptL1Ownership:test_CallableByPendingL1Owner() (gas: 37303)
+ArbitrumCrossDomainForwarderAcceptL1Ownership:test_NotCallableByNonPendingOwners() (gas: 12963)
+ArbitrumCrossDomainForwarderConstructor:test_InitialState() (gas: 18431)
+ArbitrumCrossDomainForwarderForward:test_Forward() (gas: 47610)
+ArbitrumCrossDomainForwarderForward:test_ForwardRevert() (gas: 22157)
+ArbitrumCrossDomainForwarderForward:test_NotCallableByUnknownAddress() (gas: 16048)
+ArbitrumCrossDomainForwarderTransferL1Ownership:test_CallableByL1Owner() (gas: 41402)
+ArbitrumCrossDomainForwarderTransferL1Ownership:test_CallableByL1OwnerOrZeroAddress() (gas: 19309)
+ArbitrumCrossDomainForwarderTransferL1Ownership:test_NotCallableByL2Owner() (gas: 18311)
+ArbitrumCrossDomainForwarderTransferL1Ownership:test_NotCallableByNonOwners() (gas: 13200)
+ArbitrumCrossDomainGovernorAcceptL1Ownership:test_CallableByPendingL1Owner() (gas: 37303)
+ArbitrumCrossDomainGovernorAcceptL1Ownership:test_NotCallableByNonPendingOwners() (gas: 12963)
+ArbitrumCrossDomainGovernorConstructor:test_InitialState() (gas: 18454)
+ArbitrumCrossDomainGovernorForward:test_CallableByL2Owner() (gas: 49723)
+ArbitrumCrossDomainGovernorForward:test_Forward() (gas: 47661)
+ArbitrumCrossDomainGovernorForward:test_ForwardRevert() (gas: 24324)
+ArbitrumCrossDomainGovernorForward:test_NotCallableByUnknownAddress() (gas: 18247)
+ArbitrumCrossDomainGovernorForwardDelegate:test_BubbleUpRevert() (gas: 19386)
+ArbitrumCrossDomainGovernorForwardDelegate:test_CallableByCrossDomainMessengerAddressOrL1Owner() (gas: 60623)
+ArbitrumCrossDomainGovernorForwardDelegate:test_CallableByL2Owner() (gas: 62729)
+ArbitrumCrossDomainGovernorForwardDelegate:test_NotCallableByUnknownAddress() (gas: 18237)
+ArbitrumCrossDomainGovernorForwardDelegate:test_RevertsBatchWhenOneCallFails() (gas: 64116)
+ArbitrumCrossDomainGovernorTransferL1Ownership:test_CallableByL1Owner() (gas: 41402)
+ArbitrumCrossDomainGovernorTransferL1Ownership:test_CallableByL1OwnerOrZeroAddress() (gas: 19309)
+ArbitrumCrossDomainGovernorTransferL1Ownership:test_NotCallableByL2Owner() (gas: 18311)
+ArbitrumCrossDomainGovernorTransferL1Ownership:test_NotCallableByNonOwners() (gas: 13200)
+ArbitrumSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetAnswer() (gas: 92098)
+ArbitrumSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetRoundData() (gas: 92653)
+ArbitrumSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetTimestamp() (gas: 92019)
+ArbitrumSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestAnswer() (gas: 89793)
+ArbitrumSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestRound() (gas: 89685)
+ArbitrumSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestRoundData() (gas: 90226)
+ArbitrumSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestTimestamp() (gas: 89670)
+ArbitrumSequencerUptimeFeedAggregatorV3Interface:test_AggregatorV3Interface() (gas: 98825)
+ArbitrumSequencerUptimeFeedAggregatorV3Interface:test_Return0WhenRoundDoesNotExistYet() (gas: 18309)
+ArbitrumSequencerUptimeFeedConstants:test_InitialState() (gas: 5684)
+ArbitrumSequencerUptimeFeedGasCosts:test_GasCosts() (gas: 97438)
+ArbitrumSequencerUptimeFeedProtectReadsOnAggregatorV2V3InterfaceFunctions:test_AggregatorV2V3InterfaceAllowReadsIfConsumingContractIsWhitelisted() (gas: 602705)
+ArbitrumSequencerUptimeFeedProtectReadsOnAggregatorV2V3InterfaceFunctions:test_AggregatorV2V3InterfaceDisallowReadsIfConsumingContractIsNotWhitelisted() (gas: 573793)
+ArbitrumSequencerUptimeFeedUpdateStatus:test_IgnoreOutOfOrderUpdates() (gas: 98952)
+ArbitrumSequencerUptimeFeedUpdateStatus:test_RevertIfNotL2CrossDomainMessengerAddr() (gas: 15776)
+ArbitrumSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenStatusChangeAndNoTimeChange() (gas: 113233)
+ArbitrumSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenStatusChangeAndTimeChange() (gas: 113293)
+ArbitrumValidatorValidate:test_PostSequencerOffline() (gas: 69068)
+OptimismCrossDomainForwarderAcceptL1Ownership:test_CallableByPendingL1Owner() (gas: 46891)
+OptimismCrossDomainForwarderAcceptL1Ownership:test_NotCallableByNonPendingOwners() (gas: 22152)
+OptimismCrossDomainForwarderConstructor:test_InitialState() (gas: 18266)
+OptimismCrossDomainForwarderForward:test_Forward() (gas: 58028)
+OptimismCrossDomainForwarderForward:test_ForwardRevert() (gas: 32549)
+OptimismCrossDomainForwarderForward:test_NotCallableByUnknownAddress() (gas: 13859)
+OptimismCrossDomainForwarderTransferL1Ownership:test_CallableByL1Owner() (gas: 48886)
+OptimismCrossDomainForwarderTransferL1Ownership:test_CallableByL1OwnerOrZeroAddress() (gas: 28767)
+OptimismCrossDomainForwarderTransferL1Ownership:test_NotCallableByL2Owner() (gas: 16134)
+OptimismCrossDomainForwarderTransferL1Ownership:test_NotCallableByNonOwners() (gas: 11011)
+OptimismCrossDomainGovernorAcceptL1Ownership:test_CallableByPendingL1Owner() (gas: 46891)
+OptimismCrossDomainGovernorAcceptL1Ownership:test_NotCallableByNonPendingOwners() (gas: 22152)
+OptimismCrossDomainGovernorConstructor:test_InitialState() (gas: 18289)
+OptimismCrossDomainGovernorForward:test_CallableByL2Owner() (gas: 47557)
+OptimismCrossDomainGovernorForward:test_Forward() (gas: 58087)
+OptimismCrossDomainGovernorForward:test_ForwardRevert() (gas: 32633)
+OptimismCrossDomainGovernorForward:test_NotCallableByUnknownAddress() (gas: 16061)
+OptimismCrossDomainGovernorForwardDelegate:test_BubbleUpRevert() (gas: 29181)
+OptimismCrossDomainGovernorForwardDelegate:test_CallableByCrossDomainMessengerAddressOrL1Owner() (gas: 72698)
+OptimismCrossDomainGovernorForwardDelegate:test_CallableByL2Owner() (gas: 72688)
+OptimismCrossDomainGovernorForwardDelegate:test_NotCallableByUnknownAddress() (gas: 16051)
+OptimismCrossDomainGovernorForwardDelegate:test_RevertsBatchWhenOneCallFails() (gas: 75911)
+OptimismCrossDomainGovernorTransferL1Ownership:test_CallableByL1Owner() (gas: 48886)
+OptimismCrossDomainGovernorTransferL1Ownership:test_CallableByL1OwnerOrZeroAddress() (gas: 28767)
+OptimismCrossDomainGovernorTransferL1Ownership:test_NotCallableByL2Owner() (gas: 16134)
+OptimismCrossDomainGovernorTransferL1Ownership:test_NotCallableByNonOwners() (gas: 11011)
+OptimismSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetAnswer() (gas: 59075)
+OptimismSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetRoundData() (gas: 59615)
+OptimismSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetTimestamp() (gas: 58930)
+OptimismSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestAnswer() (gas: 56867)
+OptimismSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestRound() (gas: 56753)
+OptimismSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestRoundData() (gas: 57289)
+OptimismSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestTimestamp() (gas: 56720)
+OptimismSequencerUptimeFeedAggregatorV3Interface:test_AggregatorV3Interface() (gas: 65617)
+OptimismSequencerUptimeFeedAggregatorV3Interface:test_RevertGetAnswerWhenRoundDoesNotExistYet() (gas: 18039)
+OptimismSequencerUptimeFeedAggregatorV3Interface:test_RevertGetRoundDataWhenRoundDoesNotExistYet() (gas: 18257)
+OptimismSequencerUptimeFeedAggregatorV3Interface:test_RevertGetTimestampWhenRoundDoesNotExistYet() (gas: 17963)
+OptimismSequencerUptimeFeedConstructor:test_InitialState() (gas: 21066)
+OptimismSequencerUptimeFeedGasCosts:test_GasCosts() (gas: 67140)
+OptimismSequencerUptimeFeedProtectReadsOnAggregatorV2V3InterfaceFunctions:test_AggregatorV2V3InterfaceAllowReadsIfConsumingContractIsWhitelisted() (gas: 597634)
+OptimismSequencerUptimeFeedProtectReadsOnAggregatorV2V3InterfaceFunctions:test_AggregatorV2V3InterfaceDisallowReadsIfConsumingContractIsNotWhitelisted() (gas: 573798)
+OptimismSequencerUptimeFeedUpdateStatus:test_IgnoreOutOfOrderUpdates() (gas: 66508)
+OptimismSequencerUptimeFeedUpdateStatus:test_RevertIfNotL2CrossDomainMessengerAddr() (gas: 13560)
+OptimismSequencerUptimeFeedUpdateStatus:test_RevertIfNotL2CrossDomainMessengerAddrAndNotL1SenderAddr() (gas: 23967)
+OptimismSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenNoChange() (gas: 73999)
+OptimismSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenStatusChangeAndNoTimeChange() (gas: 96119)
+OptimismSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenStatusChangeAndTimeChange() (gas: 96179)
+OptimismValidatorSetGasLimit:test_CorrectlyUpdatesTheGasLimit() (gas: 15503)
+OptimismValidatorValidate:test_PostSequencerOffline() (gas: 74813)
+OptimismValidatorValidate:test_PostSequencerStatusWhenThereIsNotStatusChange() (gas: 74869)
+OptimismValidatorValidate:test_RevertsIfCalledByAnAccountWithNoAccess() (gas: 15563)
+ScrollCrossDomainForwarderAcceptL1Ownership:test_CallableByPendingL1Owner() (gas: 46980)
+ScrollCrossDomainForwarderAcceptL1Ownership:test_NotCallableByNonPendingOwners() (gas: 22204)
+ScrollCrossDomainForwarderConstructor:test_InitialState() (gas: 17930)
+ScrollCrossDomainForwarderForward:test_Forward() (gas: 58095)
+ScrollCrossDomainForwarderForward:test_ForwardRevert() (gas: 32613)
+ScrollCrossDomainForwarderForward:test_NotCallableByUnknownAddress() (gas: 13859)
+ScrollCrossDomainForwarderTransferL1Ownership:test_CallableByL1Owner() (gas: 48952)
+ScrollCrossDomainForwarderTransferL1Ownership:test_CallableByL1OwnerOrZeroAddress() (gas: 28833)
+ScrollCrossDomainForwarderTransferL1Ownership:test_NotCallableByL2Owner() (gas: 16134)
+ScrollCrossDomainForwarderTransferL1Ownership:test_NotCallableByNonOwners() (gas: 11011)
+ScrollCrossDomainGovernorAcceptL1Ownership:test_CallableByPendingL1Owner() (gas: 46980)
+ScrollCrossDomainGovernorAcceptL1Ownership:test_NotCallableByNonPendingOwners() (gas: 22204)
+ScrollCrossDomainGovernorConstructor:test_InitialState() (gas: 17953)
+ScrollCrossDomainGovernorForward:test_CallableByL2Owner() (gas: 47552)
+ScrollCrossDomainGovernorForward:test_Forward() (gas: 58149)
+ScrollCrossDomainGovernorForward:test_ForwardRevert() (gas: 32688)
+ScrollCrossDomainGovernorForward:test_NotCallableByUnknownAddress() (gas: 16058)
+ScrollCrossDomainGovernorForwardDelegate:test_BubbleUpRevert() (gas: 29242)
+ScrollCrossDomainGovernorForwardDelegate:test_CallableByCrossDomainMessengerAddressOrL1Owner() (gas: 72750)
+ScrollCrossDomainGovernorForwardDelegate:test_CallableByL2Owner() (gas: 72740)
+ScrollCrossDomainGovernorForwardDelegate:test_NotCallableByUnknownAddress() (gas: 16048)
+ScrollCrossDomainGovernorForwardDelegate:test_RevertsBatchWhenOneCallFails() (gas: 75964)
+ScrollCrossDomainGovernorTransferL1Ownership:test_CallableByL1Owner() (gas: 48952)
+ScrollCrossDomainGovernorTransferL1Ownership:test_CallableByL1OwnerOrZeroAddress() (gas: 28833)
+ScrollCrossDomainGovernorTransferL1Ownership:test_NotCallableByL2Owner() (gas: 16134)
+ScrollCrossDomainGovernorTransferL1Ownership:test_NotCallableByNonOwners() (gas: 11011)
+ScrollSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetAnswer() (gas: 57230)
+ScrollSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetRoundData() (gas: 57760)
+ScrollSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForGetTimestamp() (gas: 57085)
+ScrollSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestAnswer() (gas: 54868)
+ScrollSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestRound() (gas: 54748)
+ScrollSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestRoundData() (gas: 55453)
+ScrollSequencerUptimeFeedAggregatorInterfaceGasCosts:test_GasUsageForLatestTimestamp() (gas: 54738)
+ScrollSequencerUptimeFeedAggregatorV3Interface:test_AggregatorV3Interface() (gas: 63903)
+ScrollSequencerUptimeFeedAggregatorV3Interface:test_RevertGetAnswerWhenRoundDoesNotExistYet() (gas: 18035)
+ScrollSequencerUptimeFeedAggregatorV3Interface:test_RevertGetRoundDataWhenRoundDoesNotExistYet() (gas: 18253)
+ScrollSequencerUptimeFeedAggregatorV3Interface:test_RevertGetTimestampWhenRoundDoesNotExistYet() (gas: 17959)
+ScrollSequencerUptimeFeedConstructor:test_InitialState() (gas: 21073)
+ScrollSequencerUptimeFeedGasCosts:test_GasCosts() (gas: 64831)
+ScrollSequencerUptimeFeedProtectReadsOnAggregatorV2V3InterfaceFunctions:test_AggregatorV2V3InterfaceAllowReadsIfConsumingContractIsWhitelisted() (gas: 597485)
+ScrollSequencerUptimeFeedProtectReadsOnAggregatorV2V3InterfaceFunctions:test_AggregatorV2V3InterfaceDisallowReadsIfConsumingContractIsNotWhitelisted() (gas: 573798)
+ScrollSequencerUptimeFeedUpdateStatus:test_IgnoreOutOfOrderUpdates() (gas: 64393)
+ScrollSequencerUptimeFeedUpdateStatus:test_RevertIfNotL2CrossDomainMessengerAddr() (gas: 13560)
+ScrollSequencerUptimeFeedUpdateStatus:test_RevertIfNotL2CrossDomainMessengerAddrAndNotL1SenderAddr() (gas: 23967)
+ScrollSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenNoChange() (gas: 71582)
+ScrollSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenStatusChangeAndNoTimeChange() (gas: 91982)
+ScrollSequencerUptimeFeedUpdateStatus:test_UpdateStatusWhenStatusChangeAndTimeChange() (gas: 92042)
+ScrollValidatorSetGasLimit:test_CorrectlyUpdatesTheGasLimit() (gas: 15503)
+ScrollValidatorValidate:test_PostSequencerOffline() (gas: 75094)
+ScrollValidatorValidate:test_PostSequencerStatusWhenThereIsNotStatusChange() (gas: 75156)
+ScrollValidatorValidate:test_RevertsIfCalledByAnAccountWithNoAccess() (gas: 15563)

contracts/remappings.txt

@@ -1,6 +1,7 @@
-ds-test/=foundry-lib/forge-std/lib/ds-test/src
-forge-std/=foundry-lib/forge-std/src
+ds-test/=foundry-lib/forge-std/lib/ds-test/src/
+forge-std/=foundry-lib/forge-std/src/
 
 @openzeppelin/=node_modules/@openzeppelin/
 hardhat/=node_modules/hardhat/
-@eth-optimism/=node_modules/@eth-optimism
+@eth-optimism/=node_modules/@eth-optimism/
+@scroll-tech/=node_modules/@scroll-tech/

contracts/src/v0.8/l2ep/README.md

@@ -0,0 +1,137 @@
+# Overview
+
+This folder contains the source code and tests for the Layer 2
+Exchange Protocol (L2EP) contracts. It is organized as follows:
+
+```text
+.
+├─/dev (stores the latest source code for L2EP)
+├─/test (stores the Foundry tests for L2EP)
+```
+
+## The `/dev` Folder
+
+The `/dev` folder contains subfolders for each chain that
+has an L2EP solution implemented for it (e.g. `/scroll`, `/arbitrum`,
+`/optimism`). It also contains a subfolder named `/interfaces`,
+which stores shared interface types between all the supported
+contracts. The top-level contracts (e.g. `CrossDomainOwnable.sol`)
+serve as either abstract or parent contracts that are meant
+to be reused for each indiviudal chain.
+
+## The `/test` Folder
+
+This folder is arranged as follows:
+
+- `/mocks`: used for both Foundry test cases and Hardhat test cases (NOTE:
+Hardhat test cases should be considered deprecated at this point)
+
+- `/[version]`: test cases for a specific version of the L2EP contracts
+
+### Testing Conventions and Methodology
+
+By convention, each testing file should end in `.t.sol` (this is a standard
+that other projects have also adopted). Each testing file in this folder
+follows a similar structure.
+
+```text
+TestFile.t.sol
+  |
+  |--- Base Contract (inherits L2EPTest contract)
+       |
+       |--- Child Contract 1 (inherits base contract)
+       |     |
+       |     |--- Test Function
+       |     |
+       |     |--- ... 
+       |
+       |
+       |--- Child Contract 2 (inherits base contract)
+       |     |
+       |     |--- Test Function
+       |     |
+       |     |--- ... 
+       |
+       |
+       ...
+```
+
+All test files contain a base contract defined at the top of the file. This
+base contract inherits from a contract called `L2EPTest`. The `L2EPTest`
+contract and base contracts have no test cases. Instead, the `L2EPTest`
+contract is meant to store data/functions that will be reused among all
+the base contracts. Similarly, the base contract is meant to store data
+and/or functions that will be reused by any contracts that inherit it.
+As such, each test file will define separate child contracts, and each
+will inherit from the base contract + define its own set of tests.
+
+The base contract defines a `setUp` function which is automatically called
+exactly once before ***each*** of the tests are run in an inheriting contract.
+The `setUp` function typically deploys a fresh set of test contracts so that
+tests can run independently of each other. Alongside the `setUp` function,
+the base contract can also define variables, constants, events, etc. that
+are meant to be reused per test.
+
+The name of the base contract follows the following convention:
+
+```text
+<NameOfContractBeingTested>Test
+```
+
+The child contract names do not follow a naming convention, but they should
+broadly describe the tests defined within it. Each test function follows the
+same pattern:
+
+```text
+test_<NameOfTest>
+```
+
+### Running Foundry Tests
+
+#### Usage
+
+First make sure you are in the contracts directory:
+
+```sh
+# Assuming you are currently in the /chainlink directory
+cd ./contracts
+```
+
+If you already have foundry installed, you can use the following command
+to run all L2EP tests:
+
+```sh
+FOUNDRY_PROFILE=l2ep forge test -vvv
+```
+
+To run a specific L2EP test, you can use a variation of the following command:
+
+```sh
+FOUNDRY_PROFILE=l2ep forge test -vvv --match-path ./src/v0.8/l2ep/test/v1_0_0/scroll/ScrollSequencerUptimeFeed.t.sol
+```
+
+Or alternatively:
+
+```sh
+FOUNDRY_PROFILE=l2ep forge test -vvv --match-contract ScrollSequencerUptimeFeed
+```
+
+If yu prefer, you can also export `FOUNDRY_PROFILE` so that it doesn't need
+to be provided before every command:
+
+```sh
+export FOUNDRY_PROFILE=l2ep
+forge test -vvv
+```
+
+A full list of flags for `forge test` can be found [here](https://book.getfoundry.sh/reference/forge/forge-test).
+
+#### Coverage
+
+First ensure that the correct files are being evaluated. For example, if only
+v1 contracts are, being evaluated then temporarily change the L2EP profile in
+`./foundry.toml`.
+
+```sh
+forge coverage
+```

contracts/src/v0.8/l2ep/test/mocks/MockAggregatorV2V3.sol

@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.9;
+
+import {AggregatorV2V3Interface} from "../../../shared/interfaces/AggregatorV2V3Interface.sol";
+
+contract MockAggregatorV2V3 is AggregatorV2V3Interface {
+  function latestAnswer() external pure returns (int256) {
+    return 0;
+  }
+
+  function latestTimestamp() external pure returns (uint256) {
+    return 0;
+  }
+
+  function latestRound() external pure returns (uint256) {
+    return 0;
+  }
+
+  function getAnswer(uint256) external pure returns (int256) {
+    return 0;
+  }
+
+  function getTimestamp(uint256 roundId) external pure returns (uint256) {
+    return roundId;
+  }
+
+  function decimals() external pure returns (uint8) {
+    return 0;
+  }
+
+  function description() external pure returns (string memory) {
+    return "";
+  }
+
+  function version() external pure returns (uint256) {
+    return 0;
+  }
+
+  function getRoundData(
+    uint80
+  )
+    external
+    pure
+    returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
+  {
+    return (0, 0, 0, 0, 0);
+  }
+
+  function latestRoundData()
+    external
+    pure
+    returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound)
+  {
+    return (73786976294838220258, 96800000000, 163826896, 1638268960, 73786976294838220258);
+  }
+}