test: add a small test on word boundary with ac matches

boreal/tests/it/variables.rs

@@ -423,6 +423,25 @@ rule a {{
     checker.check(&to_wide(b"zz a>>>34"), true);
 }
 
+#[test]
+fn test_variable_boundary_ac_confirm() {
+    // Make sure the boundary is taken into account when confirming an ac match.
+    let checker = Checker::new(
+        r#"
+rule a {
+    strings:
+        $a = /\Wabcd\W/
+    condition:
+        $a
+}"#,
+    );
+
+    checker.check(b"aabcde", false);
+    checker.check(b"<abcde", false);
+    checker.check(b"aabcd>", false);
+    checker.check(b"<abcd>", true);
+}
+
 #[test]
 fn test_variable_string_modifiers() {
     // \x76 is 'v'