Create integration tests structure and implement createInvoice integration tests

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "lib/prb-math"]
 	path = lib/prb-math
 	url = https://github.com/PaulRBerg/prb-math
+[submodule "lib/nomad-xyz/excessively-safe-call"]
+	path = lib/nomad-xyz/excessively-safe-call
+	url = https://github.com/nomad-xyz/ExcessivelySafeCall

lib/nomad-xyz/excessively-safe-call/.github/workflows/test.yml

@@ -0,0 +1,26 @@
+on: [push]
+
+name: test
+
+jobs:
+  check:
+    name: Foundry project
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: recursive
+
+      - name: Install Foundry
+        uses: foundry-rs/foundry-toolchain@v1
+        with:
+          version: nightly
+
+      - name: Run tests @ 0.8.13
+        run: forge test -vvv --use 0.8.13
+
+      - name: Run tests @ 0.7.6
+        run: forge test -vvv --use 0.7.6
+
+      - name: Run snapshot
+        run: forge snapshot

lib/nomad-xyz/excessively-safe-call/.gitignore

@@ -0,0 +1,2 @@
+cache/
+out/

lib/nomad-xyz/excessively-safe-call/.gitmodules

@@ -0,0 +1,3 @@
+[submodule "lib/ds-test"]
+	path = lib/ds-test
+	url = https://github.com/dapphub/ds-test

lib/nomad-xyz/excessively-safe-call/CHANGELOG.md

@@ -0,0 +1,7 @@
+# Changelog
+
+### Unreleased
+
+### 0.0.1-rc.1
+
+- first release

lib/nomad-xyz/excessively-safe-call/README.md

@@ -0,0 +1,110 @@
+# ExcessivelySafeCall
+
+This solidity library helps you call untrusted contracts safely. Specifically,
+it seeks to prevent _all possible_ ways that the callee can maliciously cause
+the caller to revert. Most of these revert cases are covered by the use of a
+[low-level call](https://solidity-by-example.org/call/). The main difference
+with between `address.call()`call and `address.excessivelySafeCall()` is that
+a regular solidity call will **automatically** copy bytes to memory without
+consideration of gas.
+
+This is to say, a low-level solidity call will copy _any amount of bytes_ to
+local memory. When bytes are copied from returndata to memory, the
+[memory expansion cost
+](https://ethereum.stackexchange.com/questions/92546/what-is-expansion-cost) is
+paid. This means that when using a standard solidity call, the callee can
+**"returnbomb"** the caller, imposing an arbitrary gas cost. Because this gas is
+paid _by the caller_ and _in the caller's context_, it can cause the caller to
+run out of gas and halt execution.
+
+To prevent returnbombing, we provide `excessivelySafeCall` and
+`excessivelySafeStaticCall`. These behave similarly to solidity's low-level
+calls, however, they allow the user to specify a maximum number of bytes to be
+copied to local memory. E.g. a user desiring a single return value should
+specify a `_maxCopy` of 32 bytes. Refusing to copy large blobs to local memory
+effectively prevents the callee from triggering local OOG reversion. We _also_ recommend careful consideration of the gas amount passed to untrusted
+callees.
+
+Consider the following contracts:
+
+```solidity
+contract BadGuy {
+    function youveActivateMyTrapCard() external pure returns (bytes memory) {
+        assembly{
+            revert(0, 1_000_000)
+        }
+    }
+}
+
+contract Mark {
+    function oops(address badGuy) {
+        bool success;
+        bytes memory ret;
+
+        // Mark pays a lot of gas for this copy 😬😬😬
+        (success, ret) == badGuy.call(
+            SOME_GAS,
+            abi.encodeWithSelector(
+                BadGuy.youveActivateMyTrapCard.selector
+            )
+        );
+
+        // Mark may OOG here, preventing local state changes
+        importantCleanup();
+    }
+}
+
+contract ExcessivelySafeSam {
+    using ExcessivelySafeCall for address;
+
+    // Sam is cool and doesn't get returnbombed
+    function sunglassesEmoji(address badGuy) {
+        bool success;
+        bytes memory ret;
+
+        (success, ret) == badGuy.excessivelySafeCall(
+            SOME_GAS,
+            32,  // <-- the magic. Copy no more than 32 bytes to memory
+            abi.encodeWithSelector(
+                BadGuy.youveActivateMyTrapCard.selector
+            )
+        );
+
+        // Sam can afford to clean up after himself.
+        importantCleanup();
+    }
+}
+```
+
+## When would I use this
+
+`ExcessivelySafeCall` prevents malicious callees from affecting post-execution
+cleanup (e.g. state-based replay protection). Given that a dev is unlikely to
+hard-code a call to a malicious contract, we expect most danger to come from
+dynamic dispatch protocols, where neither the callee nor the code being called
+is known to the developer ahead of time.
+
+Dynamic dispatch in solidity is probably _most_ useful for metatransaction
+protocols. This includes gas-abstraction relayers, smart contract wallets,
+bridges, etc.
+
+Nomad uses excessively safe calls for safe processing of cross-domain messages.
+This guarantees that a message recipient cannot interfere with safe operation
+of the cross-domain communication channel and message processing layer.
+
+## Interacting with the repo
+
+**To install in your project**:
+
+- install [Foundry](https://github.com/gakonst/foundry)
+- `forge install nomad-xyz/ExcessivelySafeCall`
+
+**To run tests**:
+
+- install [Foundry](https://github.com/gakonst/foundry)
+- `forge test`
+
+## A note on licensing:
+
+Tests are licensed GPLv3, as they extend the `DSTest` contract. Non-test work
+is avialable under user's choice of MIT and Apache2.0.

lib/nomad-xyz/excessively-safe-call/foundry.toml

@@ -0,0 +1,5 @@
+[profile.default]
+src = 'src'
+out = 'out'
+libs = ['lib']
+remappings = ['ds-test/=lib/ds-test/src/']

lib/nomad-xyz/excessively-safe-call/lib/ds-test/.gitignore

@@ -0,0 +1,3 @@
+/.dapple
+/build
+/out