diff --git a/LayoutTests/webgpu/whlsl/double-not.html b/LayoutTests/webgpu/whlsl/double-not.html
new file mode 100644
index 0000000..ac7f756
--- /dev/null
+++ b/LayoutTests/webgpu/whlsl/double-not.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<meta charset=utf-8>
+<meta name="timeout" content="long">
+<title>Copying.</title>
+<script src="js/test-harness.js"></script>
+<script src="../js/webgpu-functions.js"></script>
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<script>
+const whlslTests = {};
+
+whlslTests.doubleNot = async () =>
+{
+    let program = `
+        bool foo(bool x)
+        {
+            return !!x;
+        }
+    `;
+    assert_equals(await callBoolFunction(program, "foo", [makeBool(true)]), true);
+    assert_equals(await callBoolFunction(program, "foo", [makeBool(false)]), false);
+}
+
+runTests(whlslTests);
+</script>
+</html>