diff --git a/test/HelloWorld.t.sol b/test/HelloWorld.t.sol
new file mode 100644
index 0000000..6cb18cf
--- /dev/null
+++ b/test/HelloWorld.t.sol
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.24;
+
+import {Test} from "forge-std/Test.sol";
+
+/// @dev Simple smoke test — created as a test PR placeholder.
+contract HelloWorldTest is Test {
+    function test_hello() public pure {
+        // Invariant: true is true.
+        assertTrue(true, "hello world");
+    }
+}