fix: only insert once

Sponsored-by: author

1 files changed, 16 insertions, 1 deletions

diff --git a/src/main.rs b/src/main.rs
index ebb5c4f..7fd05af 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,7 +25,9 @@ impl Container {
     }
 
     fn insert(&mut self, n: i32) {
-        self.numbers.push(n);
+        if !self.contains(n) {
+            self.numbers.push(n);
+        }
     }
 
     fn remove(&mut self, n: i32) -> Option<i32> {
@@ -76,4 +78,17 @@ mod test {
         c.remove(0);
         assert!(c.is_empty());
     }
+
+    #[test]
+    fn inserts_only_once() {
+        let mut c = Container::default();
+        assert!(!c.contains(0));
+        c.insert(0);
+        c.insert(0);
+        assert_eq!(c.len(), 1);
+        assert!(!c.is_empty());
+        assert!(c.contains(0));
+        c.remove(0);
+        assert!(c.is_empty());
+    }
 }