diff --git a/tr/test.rs b/tr/test.rs
index b6fc1456d..e62e79ed9 100644
--- a/tr/test.rs
+++ b/tr/test.rs
@@ -1,7 +1,7 @@
 use std::io::process::Command;
 
-fn run(input: &str, set1: &str, set2: &str) -> Vec<u8> {
-    let mut process = Command::new("build/tr").arg(set1).arg(set2).spawn().unwrap();
+fn run(input: &str, args: &[&'static str]) -> Vec<u8> {
+    let mut process = Command::new("build/tr").args(args).spawn().unwrap();
 
     process.stdin.take_unwrap().write_str(input).unwrap();
 
@@ -14,20 +14,32 @@ fn run(input: &str, set1: &str, set2: &str) -> Vec<u8> {
 
 #[test]
 fn test_toupper() {
-    let out = run("!abcd!", "a-z", "A-Z");
+    let out = run("!abcd!", ["a-z", "A-Z"]);
     assert_eq!(out.as_slice(), bytes!("!ABCD!"));
 }
 
 #[test]
 fn test_small_set2() {
-    let out = run("@0123456789", "0-9", "X");
+    let out = run("@0123456789", ["0-9", "X"]);
     assert_eq!(out.as_slice(), bytes!("@XXXXXXXXXX"));
 }
 
 #[test]
 fn test_unicode() {
-    let out = run("(,°□°）, ┬─┬", ", ┬─┬", "╯︵┻━┻");
+    let out = run("(,°□°）, ┬─┬", [", ┬─┬", "╯︵┻━┻"]);
     assert_eq!(out.as_slice(), bytes!("(╯°□°）╯︵┻━┻"));
 }
 
+#[test]
+fn test_delete() {
+    let out = run("aBcD", ["-d", "a-z"]);
+    assert_eq!(out.as_slice(), bytes!("BD"));
+}
+
+#[test]
+fn test_delete_complement() {
+    let out = run("aBcD", ["-d", "-c", "a-z"]);
+    assert_eq!(out.as_slice(), bytes!("ac"));
+}
+