test(StakeVault): introduce test file for StakeVault

test/StakeVault.test.sol

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.26;
+
+import { Test } from "forge-std/Test.sol";
+
+import { RewardsStreamerMP } from "../src/RewardsStreamerMP.sol";
+import { StakeVault } from "../src/StakeVault.sol";
+import { MockToken } from "./mocks/MockToken.sol";
+
+contract StakeVaultTest is Test {
+    RewardsStreamerMP internal streamer;
+
+    StakeVault internal stakeVault;
+
+    MockToken internal rewardToken;
+
+    MockToken internal stakingToken;
+
+    address internal alice = makeAddr("alice");
+
+    function _createTestVault(address owner) internal returns (StakeVault vault) {
+        vm.prank(owner);
+        vault = new StakeVault(owner, streamer);
+
+        if (!streamer.isTrustedCodehash(address(vault).codehash)) {
+            streamer.setTrustedCodehash(address(vault).codehash, true);
+        }
+    }
+
+    function setUp() public virtual {
+        rewardToken = new MockToken("Reward Token", "RT");
+        stakingToken = new MockToken("Staking Token", "ST");
+        streamer = new RewardsStreamerMP(address(this), address(stakingToken), address(rewardToken));
+
+        stakingToken.mint(alice, 10_000e18);
+        stakeVault = _createTestVault(alice);
+
+        vm.prank(alice);
+        stakingToken.approve(address(stakeVault), 10_000e18);
+    }
+}
+
+contract StakingTokenTest is StakeVaultTest {
+    function setUp() public override {
+        StakeVaultTest.setUp();
+    }
+
+    function testStakeToken() public view {
+        assertEq(address(stakeVault.STAKING_TOKEN()), address(stakingToken));
+    }
+}