1 files changed, 53 insertions, 0 deletions
diff --git a/tests/ui/stdlib-unit-tests/istr.rs b/tests/ui/stdlib-unit-tests/istr.rs
new file mode 100644
index 00000000000..dca6d40d59a
--- /dev/null
+++ b/tests/ui/stdlib-unit-tests/istr.rs
@@ -0,0 +1,53 @@
+// run-pass
+
+use std::string::String;
+
+fn test_stack_assign() {
+    let s: String = "a".to_string();
+    println!("{}", s.clone());
+    let t: String = "a".to_string();
+    assert_eq!(s, t);
+    let u: String = "b".to_string();
+    assert!((s != u));
+}
+
+fn test_heap_lit() { "a big string".to_string(); }
+
+fn test_heap_assign() {
+    let s: String = "a big ol' string".to_string();
+    let t: String = "a big ol' string".to_string();
+    assert_eq!(s, t);
+    let u: String = "a bad ol' string".to_string();
+    assert!((s != u));
+}
+
+fn test_heap_log() {
+    let s = "a big ol' string".to_string();
+    println!("{}", s);
+}
+
+fn test_append() {
+    let mut s = String::new();
+    s.push_str("a");
+    assert_eq!(s, "a");
+
+    let mut s = String::from("a");
+    s.push_str("b");
+    println!("{}", s.clone());
+    assert_eq!(s, "ab");
+
+    let mut s = String::from("c");
+    s.push_str("offee");
+    assert_eq!(s, "coffee");
+
+    s.push_str("&tea");
+    assert_eq!(s, "coffee&tea");
+}
+
+pub fn main() {
+    test_stack_assign();
+    test_heap_lit();
+    test_heap_assign();
+    test_heap_log();
+    test_append();
+}