[SC-105] Rewrite tests & remove 'aave-helpers' dependency

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "lib/forge-std"]
 	path = lib/forge-std
 	url = https://github.com/foundry-rs/forge-std
-[submodule "lib/aave-helpers"]
-	path = lib/aave-helpers
-	url = https://github.com/marsfoundation/aave-helpers
+[submodule "lib/xchain-helpers"]
+	path = lib/xchain-helpers
+	url = https://github.com/marsfoundation/xchain-helpers

foundry.toml

@@ -2,10 +2,3 @@
 src = "src"
 out = "out"
 libs = ["lib"]
-remappings = [
-    'aave-helpers/=lib/aave-helpers/src/',
-    'solidity-utils/=lib/aave-helpers/lib/solidity-utils/src/',
-    'aave-address-book/=lib/aave-helpers/lib/aave-address-book/src'
-]
-
-# See more config options https://github.com/foundry-rs/foundry/tree/master/config

test/ArbitrumCrosschainTest.t.sol

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+import 'forge-std/Test.sol';
+
+import { Domain, ArbitrumDomain } from 'xchain-helpers/ArbitrumDomain.sol';
+
+import { ArbitrumBridgeExecutor } from '../src/executors/ArbitrumBridgeExecutor.sol';
+import { CrosschainForwarderArbitrum } from '../src/forwarders/CrosschainForwarderArbitrum.sol';
+
+import { CrosschainTestBase } from './CrosschainTestBase.sol';
+
+contract ArbitrumCrosschainTest is CrosschainTestBase  {
+
+    function setUp() public {
+        hostDomain = new Domain(getChain('mainnet'));
+        bridgedDomain = new ArbitrumDomain(getChain('arbitrum_one'), hostDomain);
+
+        bridgedDomain.selectFork();
+        bridgeExecutor = address(new ArbitrumBridgeExecutor(
+            defaultL2BridgeExecutorArgs.ethereumGovernanceExecutor,
+            defaultL2BridgeExecutorArgs.delay,
+            defaultL2BridgeExecutorArgs.gracePeriod,
+            defaultL2BridgeExecutorArgs.minimumDelay,
+            defaultL2BridgeExecutorArgs.maximumDelay,
+            defaultL2BridgeExecutorArgs.guardian
+        ));
+
+        hostDomain.selectFork();
+        forwarder = address(new CrosschainForwarderArbitrum(bridgeExecutor));
+        vm.deal(
+            L1_EXECUTOR,
+            0.01 ether
+        );
+    }
+
+    function testFuzz_arbitrumGasCalculations(uint256 payloadDataLength) public {
+        payloadDataLength = bound(
+            payloadDataLength,
+            256,
+            1024
+        );
+
+        hostDomain.selectFork();
+
+        vm.deal(L1_EXECUTOR, 0);
+        assertEq(L1_EXECUTOR.balance, 0);
+        (bool hasEnoughGasBefore, uint256 requiredGas) = CrosschainForwarderArbitrum(forwarder)
+            .hasSufficientGasForExecution(L1_EXECUTOR, payloadDataLength);
+        assertEq(hasEnoughGasBefore, false);
+
+        vm.deal(L1_EXECUTOR, requiredGas);
+        (bool hasEnoughGasAfter, ) = CrosschainForwarderArbitrum(forwarder)
+            .hasSufficientGasForExecution(L1_EXECUTOR, payloadDataLength);
+        assertEq(hasEnoughGasAfter, true);
+    }
+}