1 files changed, 165 insertions, 0 deletions
diff --git a/library/std/src/ffi/os_str/tests.rs b/library/std/src/ffi/os_str/tests.rs
new file mode 100644
index 00000000000..283f2b577e8
--- /dev/null
+++ b/library/std/src/ffi/os_str/tests.rs
@@ -0,0 +1,165 @@
+use super::*;
+use crate::sys_common::{AsInner, IntoInner};
+
+use crate::rc::Rc;
+use crate::sync::Arc;
+
+#[test]
+fn test_os_string_with_capacity() {
+    let os_string = OsString::with_capacity(0);
+    assert_eq!(0, os_string.inner.into_inner().capacity());
+
+    let os_string = OsString::with_capacity(10);
+    assert_eq!(10, os_string.inner.into_inner().capacity());
+
+    let mut os_string = OsString::with_capacity(0);
+    os_string.push("abc");
+    assert!(os_string.inner.into_inner().capacity() >= 3);
+}
+
+#[test]
+fn test_os_string_clear() {
+    let mut os_string = OsString::from("abc");
+    assert_eq!(3, os_string.inner.as_inner().len());
+
+    os_string.clear();
+    assert_eq!(&os_string, "");
+    assert_eq!(0, os_string.inner.as_inner().len());
+}
+
+#[test]
+fn test_os_string_capacity() {
+    let os_string = OsString::with_capacity(0);
+    assert_eq!(0, os_string.capacity());
+
+    let os_string = OsString::with_capacity(10);
+    assert_eq!(10, os_string.capacity());
+
+    let mut os_string = OsString::with_capacity(0);
+    os_string.push("abc");
+    assert!(os_string.capacity() >= 3);
+}
+
+#[test]
+fn test_os_string_reserve() {
+    let mut os_string = OsString::new();
+    assert_eq!(os_string.capacity(), 0);
+
+    os_string.reserve(2);
+    assert!(os_string.capacity() >= 2);
+
+    for _ in 0..16 {
+        os_string.push("a");
+    }
+
+    assert!(os_string.capacity() >= 16);
+    os_string.reserve(16);
+    assert!(os_string.capacity() >= 32);
+
+    os_string.push("a");
+
+    os_string.reserve(16);
+    assert!(os_string.capacity() >= 33)
+}
+
+#[test]
+fn test_os_string_reserve_exact() {
+    let mut os_string = OsString::new();
+    assert_eq!(os_string.capacity(), 0);
+
+    os_string.reserve_exact(2);
+    assert!(os_string.capacity() >= 2);
+
+    for _ in 0..16 {
+        os_string.push("a");
+    }
+
+    assert!(os_string.capacity() >= 16);
+    os_string.reserve_exact(16);
+    assert!(os_string.capacity() >= 32);
+
+    os_string.push("a");
+
+    os_string.reserve_exact(16);
+    assert!(os_string.capacity() >= 33)
+}
+
+#[test]
+fn test_os_string_default() {
+    let os_string: OsString = Default::default();
+    assert_eq!("", &os_string);
+}
+
+#[test]
+fn test_os_str_is_empty() {
+    let mut os_string = OsString::new();
+    assert!(os_string.is_empty());
+
+    os_string.push("abc");
+    assert!(!os_string.is_empty());
+
+    os_string.clear();
+    assert!(os_string.is_empty());
+}
+
+#[test]
+fn test_os_str_len() {
+    let mut os_string = OsString::new();
+    assert_eq!(0, os_string.len());
+
+    os_string.push("abc");
+    assert_eq!(3, os_string.len());
+
+    os_string.clear();
+    assert_eq!(0, os_string.len());
+}
+
+#[test]
+fn test_os_str_default() {
+    let os_str: &OsStr = Default::default();
+    assert_eq!("", os_str);
+}
+
+#[test]
+fn into_boxed() {
+    let orig = "Hello, world!";
+    let os_str = OsStr::new(orig);
+    let boxed: Box<OsStr> = Box::from(os_str);
+    let os_string = os_str.to_owned().into_boxed_os_str().into_os_string();
+    assert_eq!(os_str, &*boxed);
+    assert_eq!(&*boxed, &*os_string);
+    assert_eq!(&*os_string, os_str);
+}
+
+#[test]
+fn boxed_default() {
+    let boxed = <Box<OsStr>>::default();
+    assert!(boxed.is_empty());
+}
+
+#[test]
+fn test_os_str_clone_into() {
+    let mut os_string = OsString::with_capacity(123);
+    os_string.push("hello");
+    let os_str = OsStr::new("bonjour");
+    os_str.clone_into(&mut os_string);
+    assert_eq!(os_str, os_string);
+    assert!(os_string.capacity() >= 123);
+}
+
+#[test]
+fn into_rc() {
+    let orig = "Hello, world!";
+    let os_str = OsStr::new(orig);
+    let rc: Rc<OsStr> = Rc::from(os_str);
+    let arc: Arc<OsStr> = Arc::from(os_str);
+
+    assert_eq!(&*rc, os_str);
+    assert_eq!(&*arc, os_str);
+
+    let rc2: Rc<OsStr> = Rc::from(os_str.to_owned());
+    let arc2: Arc<OsStr> = Arc::from(os_str.to_owned());
+
+    assert_eq!(&*rc2, os_str);
+    assert_eq!(&*arc2, os_str);
+}