test: initialize constructor unit test

src/test/TestGhoBase.t.sol

@@ -29,6 +29,7 @@ import {MockUpgradeable} from './mocks/MockUpgradeable.sol';
 import {PriceOracle} from '@aave/core-v3/contracts/mocks/oracle/PriceOracle.sol';
 import {TestnetERC20} from '@aave/periphery-v3/contracts/mocks/testnet-helpers/TestnetERC20.sol';
 import {WETH9Mock} from '@aave/periphery-v3/contracts/mocks/WETH9Mock.sol';
+import {MockRedemption} from './mocks/MockRedemption.sol';
 
 // interfaces
 import {IAaveIncentivesController} from '@aave/core-v3/contracts/interfaces/IAaveIncentivesController.sol';
@@ -78,6 +79,7 @@ import {FixedFeeStrategy} from '../contracts/facilitators/gsm/feeStrategy/FixedF
 import {SampleLiquidator} from '../contracts/facilitators/gsm/misc/SampleLiquidator.sol';
 import {SampleSwapFreezer} from '../contracts/facilitators/gsm/misc/SampleSwapFreezer.sol';
 import {GsmRegistry} from '../contracts/facilitators/gsm/misc/GsmRegistry.sol';
+import {GsmConverter} from '../contracts/facilitators/gsm/converter/GsmConverter.sol';
 
 contract TestGhoBase is Test, Constants, Events {
   using WadRayMath for uint256;
@@ -102,11 +104,13 @@ contract TestGhoBase is Test, Constants, Events {
   TestnetERC20 AAVE_TOKEN;
   IStakedAaveV3 STK_TOKEN;
   TestnetERC20 USDC_TOKEN;
+  TestnetERC20 BUIDL_TOKEN;
   MockERC4626 USDC_4626_TOKEN;
   MockPool POOL;
   MockAclManager ACL_MANAGER;
   MockAddressesProvider PROVIDER;
   MockConfigurator CONFIGURATOR;
+  MockRedemption REDEMPTION;
   PriceOracle PRICE_ORACLE;
   WETH9Mock WETH;
   GhoVariableDebtToken GHO_DEBT_TOKEN;
@@ -174,6 +178,12 @@ contract TestGhoBase is Test, Constants, Events {
     );
     STK_TOKEN = IStakedAaveV3(address(stkAaveProxy));
     USDC_TOKEN = new TestnetERC20('USD Coin', 'USDC', 6, FAUCET);
+    BUIDL_TOKEN = new TestnetERC20(
+      'BlackRock USD Institutional Digital Liquidity Fund',
+      'BUIDL',
+      6,
+      FAUCET
+    );
     USDC_4626_TOKEN = new MockERC4626('USD Coin 4626', '4626', address(USDC_TOKEN));
     address ghoTokenAddress = address(GHO_TOKEN);
     address discountToken = address(STK_TOKEN);
@@ -306,6 +316,8 @@ contract TestGhoBase is Test, Constants, Events {
     controlledFacilitators[1] = address(GHO_GSM);
     vm.prank(SHORT_EXECUTOR);
     GHO_STEWARD_V2.setControlledFacilitator(controlledFacilitators, true);
+
+    REDEMPTION = new MockRedemption(address(BUIDL_TOKEN), address(USDC_TOKEN));
   }
 
   function ghoFaucet(address to, uint256 amount) public {

src/test/TestGsmConverter.t.sol

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import './TestGhoBase.t.sol';
+
+contract TestGsmConverter is TestGhoBase {
+  // using PercentageMath for uint256;
+  // using PercentageMath for uint128;
+
+  function setUp() public {
+    // (gsmSignerAddr, gsmSignerKey) = makeAddrAndKey('gsmSigner');
+  }
+
+  function testConstructor() public {
+    GsmConverter gsmConverter = new GsmConverter(
+      address(GHO_GSM),
+      address(REDEMPTION),
+      address(BUIDL_TOKEN),
+      address(USDC_TOKEN)
+    );
+    assertEq(gsmConverter.GSM(), address(GHO_GSM), 'Unexpected GSM address');
+    assertEq(
+      gsmConverter.REDEMPTION_CONTRACT(),
+      address(REDEMPTION),
+      'Unexpected redemption contract address'
+    );
+    assertEq(
+      gsmConverter.REDEEMABLE_ASSET(),
+      address(BUIDL_TOKEN),
+      'Unexpected redeemable asset address'
+    );
+    assertEq(
+      gsmConverter.REDEEMED_ASSET(),
+      address(USDC_TOKEN),
+      'Unexpected redeemed asset address'
+    );
+  }
+}

src/test/mocks/MockRedemption.sol

@@ -0,0 +1,63 @@
+/**
+ * Copyright 2024 Circle Internet Financial, LTD. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+pragma solidity ^0.8.10;
+
+import {IRedemption} from '../../contracts/facilitators/gsm/dependencies/circle/IRedemption.sol';
+import {IERC20} from '@openzeppelin/contracts/token/ERC20/IERC20.sol';
+import {SafeERC20} from '@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol';
+
+/**
+ * @title MockRedemption
+ * @dev Asset token is ERC20-compatible
+ * @dev Liquidity token is ERC20-compatible
+ */
+contract MockRedemption is IRedemption {
+  using SafeERC20 for IERC20;
+
+  /**
+   * @inheritdoc IRedemption
+   */
+  address public immutable asset;
+
+  /**
+   * @inheritdoc IRedemption
+   */
+  address public immutable liquidity;
+
+  /**
+   * @param _asset Address of asset token
+   * @param _liquidity Address of liquidity token
+   */
+  constructor(address _asset, address _liquidity) {
+    asset = _asset;
+    liquidity = _liquidity;
+  }
+
+  function test_coverage_ignore() public virtual {
+    // Intentionally left blank.
+    // Excludes contract from coverage.
+  }
+
+  /**
+   * @inheritdoc IRedemption
+   */
+  function redeem(uint256 amount) external {
+    // Intentionally left blank.
+  }
+}