test(rm): Add a test for multiple -f (#1671)

tests/by-util/test_rm.rs

@@ -85,6 +85,24 @@ fn test_rm_force() {
     assert!(!at.file_exists(file_b));
 }
 
+#[test]
+fn test_rm_force_multiple() {
+    let (at, mut ucmd) = at_and_ucmd!();
+    let file_a = "test_rm_force_a";
+    let file_b = "test_rm_force_b";
+
+    ucmd.arg("-f")
+        .arg("-f")
+        .arg("-f")
+        .arg(file_a)
+        .arg(file_b)
+        .succeeds()
+        .no_stderr();
+
+    assert!(!at.file_exists(file_a));
+    assert!(!at.file_exists(file_b));
+}
+
 #[test]
 fn test_rm_empty_directory() {
     let (at, mut ucmd) = at_and_ucmd!();