tests: Add tests for replacen()

Author: Jonas Berlin

tests/replace.rs

@@ -228,3 +228,15 @@ replace!(
     bytes!(&std::borrow::Cow::<'_, [u8]>::Owned(vec![b'Z'])),
     "age: Z6"
 );
+
+#[test]
+fn replacen_no_captures() {
+    let re = regex!(r"[0-9]");
+    assert_eq!(re.replacen(text!("age: 1234"), 2, t!("Z")), text!("age: ZZ34"));
+}
+
+#[test]
+fn replacen_with_captures() {
+    let re = regex!(r"([0-9])");
+    assert_eq!(re.replacen(text!("age: 1234"), 2, t!("${1}Z")), text!("age: 1Z2Z34"));
+}