Rollup merge of #41249 - GuillaumeGomez:rustdoc-render, r=steveklabnik,frewsxcv

[rust.git] / src / libcollections / tests / cow_str.rs

diff --git a/src/libcollections/tests/cow_str.rs b/src/libcollections/tests/cow_str.rs
index b29245121daadeb52d6c206130090d43e9406008..aa87ee84b3e9769ea36625c20afc7ec77a3698f6 100644 (file)
--- a/src/libcollections/tests/cow_str.rs
+++ b/src/libcollections/tests/cow_str.rs
@@ -139,3 +139,13 @@ fn check_cow_add_assign_str() {
     assert_eq!("Hi, World!", owned);
     assert_eq!("Hello, World!", borrowed);
 }
+
+#[test]
+fn check_cow_clone_from() {
+    let mut c1: Cow<str> = Cow::Owned(String::with_capacity(25));
+    let s: String = "hi".to_string();
+    assert!(s.capacity() < 25);
+    let c2: Cow<str> = Cow::Owned(s);
+    c1.clone_from(&c2);
+    assert!(c1.into_owned().capacity() >= 25);
+}
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