Add NoncesKeyed variant (#5272)

test/utils/NoncesKeyed.test.js

@@ -0,0 +1,17 @@
+const { ethers } = require('hardhat');
+const { loadFixture } = require('@nomicfoundation/hardhat-network-helpers');
+const { shouldBehaveLikeNonces, shouldBehaveLikeNoncesKeyed } = require('./Nonces.behavior');
+
+async function fixture() {
+  const mock = await ethers.deployContract('$NoncesKeyed');
+  return { mock };
+}
+
+describe('NoncesKeyed', function () {
+  beforeEach(async function () {
+    Object.assign(this, await loadFixture(fixture));
+  });
+
+  shouldBehaveLikeNonces();
+  shouldBehaveLikeNoncesKeyed();
+});