X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=library%2Falloc%2Ftests%2Fstring.rs;h=7ba1c2c611686c8a128f66a448fdc29266e6e7cf;hb=fb9bb2b5ca517d85e1041ea9f80d06f48054624c;hp=d38655af78cb79175e95fd294f28584f71f6f94f;hpb=6b269e44322cfca727fd0e793d3a60bd371cbcae;p=rust.git

diff --git a/library/alloc/tests/string.rs b/library/alloc/tests/string.rs
index d38655af78c..7ba1c2c6116 100644
--- a/library/alloc/tests/string.rs
+++ b/library/alloc/tests/string.rs
@@ -1,6 +1,7 @@
 use std::borrow::Cow;
 use std::collections::TryReserveError::*;
 use std::mem::size_of;
+use std::ops::Bound::*;
 
 pub trait IntoCow<'a, B: ?Sized>
 where
@@ -278,17 +279,21 @@ fn test_split_off_mid_char() {
 #[test]
 fn test_split_off_ascii() {
     let mut ab = String::from("ABCD");
+    let orig_capacity = ab.capacity();
     let cd = ab.split_off(2);
     assert_eq!(ab, "AB");
     assert_eq!(cd, "CD");
+    assert_eq!(ab.capacity(), orig_capacity);
 }
 
 #[test]
 fn test_split_off_unicode() {
     let mut nihon = String::from("日本語");
+    let orig_capacity = nihon.capacity();
     let go = nihon.split_off("日本".len());
     assert_eq!(nihon, "日本");
     assert_eq!(go, "語");
+    assert_eq!(nihon.capacity(), orig_capacity);
 }
 
 #[test]
@@ -463,6 +468,20 @@ fn test_drain() {
     assert_eq!(t, "");
 }
 
+#[test]
+#[should_panic]
+fn test_drain_start_overflow() {
+    let mut s = String::from("abc");
+    s.drain((Excluded(usize::MAX), Included(0)));
+}
+
+#[test]
+#[should_panic]
+fn test_drain_end_overflow() {
+    let mut s = String::from("abc");
+    s.drain((Included(0), Included(usize::MAX)));
+}
+
 #[test]
 fn test_replace_range() {
     let mut s = "Hello, world!".to_owned();
@@ -500,6 +519,20 @@ fn test_replace_range_inclusive_out_of_bounds() {
     s.replace_range(5..=5, "789");
 }
 
+#[test]
+#[should_panic]
+fn test_replace_range_start_overflow() {
+    let mut s = String::from("123");
+    s.replace_range((Excluded(usize::MAX), Included(0)), "");
+}
+
+#[test]
+#[should_panic]
+fn test_replace_range_end_overflow() {
+    let mut s = String::from("456");
+    s.replace_range((Included(0), Included(usize::MAX)), "");
+}
+
 #[test]
 fn test_replace_range_empty() {
     let mut s = String::from("12345");
@@ -721,3 +754,11 @@ fn test_from_char() {
     let s: String = 'x'.into();
     assert_eq!(s, 'x'.to_string());
 }
+
+#[test]
+fn test_str_concat() {
+    let a: String = "hello".to_string();
+    let b: String = "world".to_string();
+    let s: String = format!("{}{}", a, b);
+    assert_eq!(s.as_bytes()[9], 'd' as u8);
+}