test: add repro test for skip (#6189)

Author: mattsse

crates/forge/tests/it/repros.rs

@@ -319,3 +319,9 @@ async fn test_issue_6170() {
     assert_eq!(test.status, TestStatus::Failure);
     assert_eq!(test.reason, Some("log != expected log".to_string()));
 }
+
+// <https://github.com/foundry-rs/foundry/issues/6180>
+#[tokio::test(flavor = "multi_thread")]
+async fn test_issue_6180() {
+    test_repro!("Issue6180");
+}

testdata/cheats/Vm.sol

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: Unlicense
+pragma solidity 0.8.18;
+
+import "ds-test/test.sol";
+import "../cheats/Vm.sol";
+
+// https://github.com/foundry-rs/foundry/issues/6180
+contract Issue6180Test is DSTest {
+    Vm constant vm = Vm(HEVM_ADDRESS);
+
+    function test_timebug() external {
+        uint256 start = block.timestamp;
+        uint256 count = 4;
+        uint256 duration = 15;
+        for (uint256 i; i < count; i++) {
+            vm.warp(block.timestamp + duration);
+        }
+
+        uint256 end = block.timestamp;
+        assertEq(end, start + count * duration);
+        assertEq(end - start, count * duration);
+    }
+}