contracts: add e2e test to ensure signed queries are functioning (#167)

contracts/contracts/tests/SignedQueriesTests.sol

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: Apache-2.0
+
+pragma solidity ^0.8.0;
+
+contract SignedQueriesTests {
+    function testSignedQueries() external view returns (address) {
+        return msg.sender;
+    }
+}

contracts/hardhat.config.ts

@@ -1,4 +1,4 @@
-//import '@oasisprotocol/sapphire-hardhat';
+import '@oasisprotocol/sapphire-hardhat';
 import { HardhatUserConfig, task } from 'hardhat/config';
 import '@typechain/hardhat';
 import '@nomicfoundation/hardhat-chai-matchers';

contracts/test/signedqueries.ts

@@ -0,0 +1,22 @@
+import { expect } from 'chai';
+import { ethers } from 'hardhat';
+import { SignedQueriesTests } from '../typechain-types/contracts/tests/SignedQueriesTests';
+import { SignedQueriesTests__factory } from '../typechain-types/factories/contracts/tests';
+
+describe('Signed Queries', () => {
+  let contract: SignedQueriesTests;
+
+  before(async () => {
+    const factory = (await ethers.getContractFactory(
+      'SignedQueriesTests',
+    )) as SignedQueriesTests__factory;
+    contract = await factory.deploy();
+    await contract.deployed();
+  });
+
+  it('msg.sender is signer', async () => {
+    const [owner] = await ethers.getSigners();
+    const who = await contract.testSignedQueries();
+    expect(who).eq(await owner.getAddress());
+  });
+});