feat: Add foundry.toml to support forge commands on repo

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lib/forge-std"]
+	path = lib/forge-std
+	url = https://github.com/foundry-rs/forge-std

foundry.toml

@@ -0,0 +1,26 @@
+[profile.default]
+src = "contracts"
+out = "artifacts"
+libs = ["node_modules", "lib"]
+remappings = [
+    "@across-protocol/=node_modules/@across-protocol/",
+    "@ensdomains/=node_modules/@ensdomains/",
+    "@eth-optimism/=node_modules/@eth-optimism/",
+    "@gnosis.pm/=node_modules/@gnosis.pm/",
+    "@maticnetwork/=node_modules/@maticnetwork/",
+    "@matterlabs/=node_modules/@matterlabs/",
+    "@openzeppelin/=node_modules/@openzeppelin/",
+    "@scroll-tech/=node_modules/@scroll-tech/",
+    "@uma/=node_modules/@uma/",
+    "@uniswap/=node_modules/@uniswap/",
+    "arb-bridge-eth/=node_modules/arb-bridge-eth/",
+    "arb-bridge-peripherals/=node_modules/arb-bridge-peripherals/",
+    "arbos-precompiles/=node_modules/arbos-precompiles/",
+    "base64-sol/=node_modules/base64-sol/",
+    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
+    "hardhat-deploy/=node_modules/hardhat-deploy/",
+    "hardhat/=node_modules/hardhat/",
+]
+via_ir = true
+
+# See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options

test/SpokePool.Relay.ts

@@ -879,6 +879,42 @@ describe("SpokePool Relayer Logic", async function () {
             )
         ).to.be.revertedWith("invalid signature");
       });
+      it("validates ERC-1271 depositor contract signature", async function () {
+        // The MockERC1271 contract returns true for isValidSignature if the signature was signed by the contract's
+        // owner, so using the depositor's signature should succeed and using someone else's signature should fail.
+        const incorrectSignature = await getUpdatedUSSDepositSignature(
+          relayer, // not depositor
+          relayData.depositId,
+          relayData.originChainId,
+          updatedOutputAmount,
+          updatedRecipient,
+          updatedMessage
+        );
+        await expect(
+          spokePool
+            .connect(relayer)
+            .fillUSSRelayWithUpdatedDeposit(
+              { ...relayData, depositor: erc1271.address },
+              consts.repaymentChainId,
+              updatedOutputAmount,
+              updatedRecipient,
+              updatedMessage,
+              incorrectSignature
+            )
+        ).to.be.revertedWith("invalid signature");
+        await expect(
+          spokePool
+            .connect(relayer)
+            .fillUSSRelayWithUpdatedDeposit(
+              { ...relayData, depositor: erc1271.address },
+              consts.repaymentChainId,
+              updatedOutputAmount,
+              updatedRecipient,
+              updatedMessage,
+              signature
+            )
+        ).to.not.be.reverted;
+      });
       it("cannot send updated fill after original fill", async function () {
         await spokePool.connect(relayer).fillUSSRelay(relayData, consts.repaymentChainId);
         await expect(