From 71de9dbe5bc823a9603318c9cf92f58d7f5eb6f9 Mon Sep 17 00:00:00 2001
From: Jethro Beekman <jethro@jbeekman.nl>
Date: Wed, 3 May 2017 10:24:49 -0700
Subject: [PATCH] Add test

---
 src/libstd/sys/windows/os.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/libstd/sys/windows/os.rs b/src/libstd/sys/windows/os.rs
index 402d4f9ee6e..a51b458451e 100644
--- a/src/libstd/sys/windows/os.rs
+++ b/src/libstd/sys/windows/os.rs
@@ -317,3 +317,17 @@ pub fn home_dir() -> Option<PathBuf> {
 pub fn exit(code: i32) -> ! {
     unsafe { c::ExitProcess(code as c::UINT) }
 }
+
+#[cfg(test)]
+mod tests {
+    use io::Error;
+    use sys::c;
+
+    // tests `error_string` above
+    #[test]
+    fn ntstatus_error() {
+        const STATUS_UNSUCCESSFUL: u32 = 0xc000_0001;
+        assert!(!Error::from_raw_os_error((STATUS_UNSUCCESSFUL | c::FACILITY_NT_BIT) as _)
+            .to_string().contains("FormatMessageW() returned error"));
+    }
+}
-- 
2.44.0