fix tests

Author: glebpom

src/header/map.rs

@@ -3532,7 +3532,7 @@ fn test_bounds() {
 #[test]
 fn skip_duplicates_during_key_iteration() {
     let mut map = HeaderMap::new();
-    map.append("a", HeaderValue::from_static("a"));
-    map.append("a", HeaderValue::from_static("b"));
+    map.try_append("a", HeaderValue::from_static("a")).unwrap();
+    map.try_append("a", HeaderValue::from_static("b")).unwrap();
     assert_eq!(map.keys().count(), map.keys_len());
 }

src/header/value.rs

@@ -488,11 +488,11 @@ mod from_header_name_tests {
     #[test]
     fn it_can_insert_header_name_as_header_value() {
         let mut map = HeaderMap::new();
-        map.insert(name::UPGRADE, name::SEC_WEBSOCKET_PROTOCOL.into());
-        map.insert(
+        map.try_insert(name::UPGRADE, name::SEC_WEBSOCKET_PROTOCOL.into()).unwrap();
+        map.try_insert(
             name::ACCEPT,
             name::HeaderName::from_bytes(b"hello-world").unwrap().into(),
-        );
+        ).unwrap();
 
         assert_eq!(
             map.get(name::UPGRADE).unwrap(),