Add SmallStr

1 files changed, 20 insertions, 0 deletions

diff --git a/compiler/rustc_data_structures/src/small_str/tests.rs b/compiler/rustc_data_structures/src/small_str/tests.rs
new file mode 100644
index 00000000000..7635a9b7204
--- /dev/null
+++ b/compiler/rustc_data_structures/src/small_str/tests.rs
@@ -0,0 +1,20 @@
+use super::*;
+
+#[test]
+fn empty() {
+    let s = SmallStr::<1>::new();
+    assert!(s.empty());
+    assert_eq!("", s.as_str());
+    assert!(!s.spilled());
+}
+
+#[test]
+fn from_iter() {
+    let s = ["aa", "bb", "cc"].iter().collect::<SmallStr<6>>();
+    assert_eq!("aabbcc", s.as_str());
+    assert!(!s.spilled());
+
+    let s = ["aa", "bb", "cc", "dd"].iter().collect::<SmallStr<6>>();
+    assert_eq!("aabbccdd", s.as_str());
+    assert!(s.spilled());
+}