fix: cgt tests coverage

packages/contracts-bedrock/test/L1/SystemConfig.t.sol

@@ -11,6 +11,7 @@ import { ForgeArtifacts, StorageSlot } from "scripts/libraries/ForgeArtifacts.so
 import { Constants } from "src/libraries/Constants.sol";
 import { EIP1967Helper } from "test/mocks/EIP1967Helper.sol";
 import { Features } from "src/libraries/Features.sol";
+import { DevFeatures } from "src/libraries/DevFeatures.sol";
 
 // Interfaces
 import { IResourceMetering } from "interfaces/L1/IResourceMetering.sol";
@@ -843,3 +844,19 @@ contract SystemConfig_SetMinBaseFee_Test is SystemConfig_TestInit {
         assertEq(systemConfig.minBaseFee(), newMinBaseFee);
     }
 }
+
+/// @title SystemConfig_IsCustomGasToken_Test
+/// @notice Test contract for SystemConfig `isCustomGasToken` function.
+contract SystemConfig_IsCustomGasToken_Test is SystemConfig_TestInit {
+    /// @notice Tests that `isCustomGasToken` returns the correct value.
+    function test_isCustomGasToken_enabled_succeeds() external {
+        skipIfDevFeatureDisabled(DevFeatures.CUSTOM_GAS_TOKEN);
+        assertTrue(systemConfig.isCustomGasToken());
+    }
+
+    /// @notice Tests that `isCustomGasToken` returns the correct value.
+    function test_isCustomGasToken_disabled_succeeds() external {
+        skipIfDevFeatureEnabled(DevFeatures.CUSTOM_GAS_TOKEN);
+        assertFalse(systemConfig.isCustomGasToken());
+    }
+}

packages/contracts-bedrock/test/L2/L1Block.t.sol

@@ -6,6 +6,7 @@ import { CommonTest } from "test/setup/CommonTest.sol";
 
 // Libraries
 import { Encoding } from "src/libraries/Encoding.sol";
+import { Constants } from "src/libraries/Constants.sol";
 import "src/libraries/L1BlockErrors.sol";
 
 /// @title L1Block_ TestInit
@@ -20,6 +21,28 @@ contract L1Block_TestInit is CommonTest {
     }
 }
 
+/// @title L1Block_Version_Test
+/// @notice Test contract for L1Block `version` function.
+contract L1Block_Version_Test is L1Block_TestInit {
+    /// @notice Tests that the version function returns a valid string. We avoid testing the
+    ///         specific value of the string as it changes frequently.
+    function test_version_succeeds() external view {
+        assert(bytes(l1Block.version()).length > 0);
+    }
+}
+
+/// @title L1Block_GasPayingToken_Test
+/// @notice Tests the `gasPayingToken` function of the `L1Block` contract.
+contract L1Block_GasPayingToken_Test is L1Block_TestInit {
+    /// @notice Tests that the `gasPayingToken` function returns the correct token address and
+    ///         decimals.
+    function test_gasPayingToken_succeeds() external view {
+        (address token, uint8 decimals) = l1Block.gasPayingToken();
+        assertEq(token, Constants.ETHER);
+        assertEq(uint256(decimals), uint256(18));
+    }
+}
+
 /// @title L1Block_GasPayingTokenName_Test
 /// @notice Tests the `gasPayingTokenName` function of the `L1Block` contract.
 contract L1Block_GasPayingTokenName_Test is L1Block_TestInit {

packages/contracts-bedrock/test/L2/L1BlockCGT.t.sol

@@ -31,6 +31,26 @@ contract L1BlockCGT_TestInit is CommonTest {
     }
 }
 
+/// @title L1BlockCGT_Version_Test
+/// @notice Test contract for L1BlockCGT `version` function.
+contract L1BlockCGT_Version_Test is L1BlockCGT_TestInit {
+    /// @notice Tests that the version function returns a valid string. We avoid testing the
+    ///         specific value of the string as it changes frequently.
+    function test_version_succeeds() external view {
+        assert(bytes(l1BlockCGT.version()).length > 0);
+    }
+}
+
+/// @title L1BlockCGT_GasPayingToken_Test
+/// @notice Tests the `gasPayingToken` function of the `L1BlockCGT` contract.
+contract L1BlockCGT_GasPayingToken_Test is L1BlockCGT_TestInit {
+    /// @notice Tests that the `gasPayingToken` function reverts.
+    function test_gasPayingToken_deprecated_reverts() external {
+        vm.expectRevert("L1BlockCGT: deprecated");
+        l1BlockCGT.gasPayingToken();
+    }
+}
+
 /// @title L1BlockCGT_GasPayingTokenName_Test
 /// @notice Tests the `gasPayingTokenName` function of the `L1Block` contract with custom gas
 ///         token enabled.

packages/contracts-bedrock/test/L2/L2ToL1MessagePasser.t.sol

@@ -8,6 +8,16 @@ import { CommonTest } from "test/setup/CommonTest.sol";
 import { Types } from "src/libraries/Types.sol";
 import { Hashing } from "src/libraries/Hashing.sol";
 
+/// @title L2ToL1MessagePasser_Version_Test
+/// @notice Tests the `version` function of the `L2ToL1MessagePasser` contract.
+contract L2ToL1MessagePasser_Version_Test is CommonTest {
+    /// @notice Tests that the `version` function returns the correct string. We avoid testing the
+    ///         specific value of the string as it changes frequently.
+    function test_version_succeeds() external view {
+        assert(bytes(l2ToL1MessagePasser.version()).length > 0);
+    }
+}
+
 /// @title L2ToL1MessagePasser_InitiateWithdrawal_Test
 /// @notice Tests the `initiateWithdrawal` function of the `L2ToL1MessagePasser` contract.
 contract L2ToL1MessagePasser_InitiateWithdrawal_Test is CommonTest {

packages/contracts-bedrock/test/L2/L2ToL1MessagePasserCGT.t.sol

@@ -21,6 +21,17 @@ contract L2ToL1MessagePasserCGT_TestInit is CommonTest {
     }
 }
 
+/// @title L2ToL1MessagePasserCGT_Version_Test
+/// @notice Tests the `version` function of the `L2ToL1MessagePasser` contract with custom gas token
+///         enabled.
+contract L2ToL1MessagePasserCGT_Version_Test is L2ToL1MessagePasserCGT_TestInit {
+    /// @notice Tests that the `version` function returns the correct string. We avoid testing the
+    ///         specific value of the string as it changes frequently.
+    function test_version_succeeds() external view {
+        assert(bytes(l2ToL1MessagePasser.version()).length > 0);
+    }
+}
+
 /// @title L2ToL1MessagePasserCGT_InitiateWithdrawal_Test
 /// @notice Tests the `initiateWithdrawal` function of the `L2ToL1MessagePasser` contract with
 ///         custom gas token enabled.

packages/contracts-bedrock/test/scripts/L2Genesis.t.sol

@@ -249,7 +249,7 @@ contract L2Genesis_Run_Test is L2Genesis_TestInit {
 
         // Expect revert when nativeAssetLiquidityAmount is greater than type(uint248).max
         input.nativeAssetLiquidityAmount += 1;
-        vm.expectRevert("Native asset liquidity amount must be less than or equal to type(uint248).max");
+        vm.expectRevert("L2Genesis: native asset liquidity amount must be less than or equal to type(uint248).max");
         genesis.run(input);
         // Reset nativeAssetLiquidityAmount input to type(uint248).max
         input.nativeAssetLiquidityAmount = type(uint248).max;